Professor Kelly, I like you voice, your deep knowledge, willingness to teach & share this knowledge : you are true inspiration to so many people : your teaching a blessing to the world : Cheers Buddy
Meg drives our 2005 Toyota Prius II with 138K+ miles : cut off the rear muffler ^^ Strong Hybrid I drive our 2014 Honda CRz II with 17K+ miles : all OEM except LED's to replace halogen lamps : Weak Hybrid We also use our 2013 Honda PCX150 scooter with its crank mounted alternator starter generator : Barely Hybrid Meg & I also travel using Segway Minipro self-balancing personal mobility assist device : Fully Electric
This video helped me solve my coolant heat exchange pipe issue that had became damaged from a road hazard. My shop didn’t know either. They gave me an atta-boy for figuring it out, but my thanks goes to you Sir. Thank you.
Thank you SO much Professor John D Kelly for Producing, Editing and Narrating this fantastic series of educational videos. This is the most informative automotive show ever, clearest photography, sound, explanations and nothing is hidden. If I may say this, Professor Kelly you are an amazing person. Top marks. From the UK 🇬🇧🇺🇸.
That's what I do too with new "toys". Turn it on so I know it works before I thinker with it, then opening it up so I know how it works and finally put it back together. If it does not work anymore, then I know I did something wrong because I confirmed it worked before.
Love these videos. Its clear enough for anyone to understand and goes deep enough so you know whats going on. Some asks whats regenerative breaking, someone might say well thats when a motor converts the energy from the wheels back to the battery. You know what were looking for, a simple but in depth explanation with the engine parts right there to show and demonstrate. Just awesome. Thank you sir.
Being mostly focused on all-electric cars, I was not sure this video would have much relevance to my intended learning. But on thinking about it, I realize it's good to show me the complexity of ICE and hybrid vehicles.
I used to be a hybrid sceptic - I simply thought that the tech is not ready yet and that it was too complicated to be reliable. I have changed my mind after watching your explanation of Toyota`s HSD (eCVT) and eAWD. My next car will be eCVT eAWD from Toyota. There are few models on Japanese market so the choice is here. ... saying that I do not understand why Toyota`s marketing team is hiding Harrier from the rest of the world. It is the "cheapest Lexus SUV" on the market. Has classic looks and makes a great SUV. It sells in big numbers on Japanese market. It is a true posh RAV4 ;) Thank you so much for your work.
This is a fascinating tour and explanation of the vehicle’s cooling system professor Kelly. I enjoyed listening to your descriptions of the components. These cars are a marvel of technology. Thank you very much.
Great video as usual Professor Kelly. We are now familiarising ourselves with hybrids...........close to 3 years. Amidst the thousands of naysayers of Hybrid techno;ogy, Toyota Hybrid is No. 1 here in Trinidad & Tobago, West Indies. Thank you so much.
A fascinating video on learning (in depth) the way cooling systems are on modern hybrids vs traditional combustion engine cooling systems. Didn't know there were 2 separate water pumps, that there is so many hoses/circuits in that one radiator, etc.
Love your in-depth work explaining the cooling system. It is way to complicated more than it needs to be. But I understand how engineers think and work. They don’t teach simplicity in any engineering school. I would simplify the system by cooling the liquid by passing the liquid over a bismuth telluride plate, which uses only 0.70 of a DC amp. Eliminating compressor and more moving parts. Please look it up. Heat is the enemy of all electrical systems. Love your work!
Thermoelectric coolers are notoriously inefficient. To match up, it would need to be both big, and run at quite a high voltage, neither of which is very cheap compared to what they have here.
brilliant Professor , im a qualified mechanic , i don't deal with hybrids , i think i need to enrol on a hybrid course , thanks your knowledge is fantastic , you got me really interested , Thank you from UK
I would thank you quite much for your help us , and I feel you are doing an arduous job for us giving precise knowledge about automobile technology ( such as Hybrid systems ) , and I would like fervently request you that if we can learn about automotive air conditioning systems from you we can repair those more confidently, because of your precise theories. thank you very much,,,, !
It's very interesting with all the detailed design at this complex cooling system for the internal combustion engine and the hybrid inverter, Toyota left the two hoses for the exhaust heat recirc system fully unshielded, especially when they run the entire length of the very hot 2nd catalytic converter. These hoses will probably spring a leak with high mileage cars.
Thanks for your feedback. The second catalytic converter has an external shield around it by the coolant hoses for the exhaust heat recirculation system. The system uses stainless steel pipes up a little further above the catalytic converters and the exhaust manifold. The hoses are only used where there is powertrain flexing. Have a good day!
Great info Professor, thank you! It's scary how many intricate moving parts are under a vehicle open to road grime and splatter. Thinking too how the salt and sand/dirt on the roads will interfere with the long term operations of these parts. Really have to question where the "technology meets the road" so to speak is really a "head on collision".
The transaxle cooling system is quite robust when compared with the Gen 3 unit. I can see why they allow towing in some markets now. I've towed up to 1100 lbs with my 2010 while observing temps on MG1&2 and the inverter coolant temp to be well within standards. Great video as always.
WeberAuto According to a British car publication the Gen 4 is rated for 725 kg (1,598 lbs) in Europe. I've heard the Gen 3 was rated for towing in Europe also though I could not verify limits. Not sure if Toyota NA recommends towing for Gen 4 units sold here. Small teardrop shaped Travel trailers are very popular in Europe, I can imagine the Prius is well suited for that.
Creig Mac were you able to observe the transmission temperature as well? I have a 2018 Highlander hybrid that I plan to use for towing a 1200 lb trailer. I can’t find an OBD 2 scanner that will show the transmission temperature. Thanks
Excellent description! I never knew the Prius has a 2 part radiator. Our Fiat 500e has 2 coolant loops, one for the battery and one for the battery charger, inverter / converter, and traction motor. The battery loop has it's own small radiator mounted in front of the ac condenser, and includes a 6kw heater and r134a heat exchanger so that the evecu can both cool and heat the battery. The other loop uses what looks like a normal 500 radiator mounted behind the condenser. The cabin heat is from a PTC element, there is no water heater core.
Thank you and thanks for the description of the cooling/heating systems on your 500e. Almost every EV I have seen have similar systems. I will be doing similar videos on the Chevrolet Bolt and Volt in the near futures.
The post 2010 Prii have two disadvantages. One is the expensive to replace electric water pump. The second is the hard to service EGR valve. That's why I nominate the GEN 2 as the Prius you can keep cheap for 20 years. The taxi drivers here in San Diego buy old GEN 2s at 100k + and drive them to 400k. The old mechanical water pumps go over 150-200k and there is no EGR valve. The only GEN 2 problems seem to be the 2 Way hot-water valve and the inverter water pump that was on a recall. That pump was redesigned from a one bearing to two bearings on the shaft. Besides the cat going out at 150-200k and in Calif requiring an OEM cat at $1300-2000, the GEN 2 is bulletproof. As a bonus, the GEN2 had an available JBL audio system that beat the pants off the GEN 3 & 4 audio systems. And of course, you can easily service the main battery modules. Toyota will sell you a new battery you can install yourself for $1950 plus a $1300 core charge. Try that with a Prius Prime LION battery. The 2016 up Prii are great until the battery warranty expires. What is the resale value if the battery goes out? What is a dead Tesla worth? Not much.
Toyota sold me a Toyota long life concentrated fluid, I will check with them again if it’s compatible. Thanks for a great detailed video. Very informative
I didn't hear you mentioning the inverter cooling pump assembly. I believe it is visible below the inverter inlet and outlets. It looks like it's readily accessible and easily replaceable from underneath the vehicle.
Thanks for your effort. A schematic diagram of the entire cooling system showing all components in separate loops for ICE & Electrics would be helpful. At 3:07 - the pins protruding from the electric water pump housing are an omnidirectional heat sink; a conical shape is actually the most efficient. I thought it was very strange to have a thermostat on the return line FROM the radiator; I would assume this is where the exhaust and EGR loops mix in, (?)
This is the first time I've ever seen a thermostat on a coolant inlet, usually they're on the outlet to the radiator. Is there a reason the thermostat is on the inlet in this case?
Professor can I have a question? I understand there is no V-belt to drive the water pump nor the AC compressor as you have shown in the video. Is there a generator/alternator which is driven by a belt to charge the 12V battery? Also, on the other side of the crank shaft there must be a timing belt to drive the camshafts right?
The 12V battery is charged by the DC-to-DC converter located inside the inverter-converter assembly. The converter is powered by the high-voltage battery.
Sangueffusor is right, there is no alternator. The 12V system is charged by a DC-to-DC converter. Yes, there are still timing belt(s) or chain(s) from the crankshaft to the camshaft(s). They are under protective covers on the engine. Thanks for your feedback!
Great video as usual. Thanks for sharing your knowledge. Potentially stupid question. What is the need for the mechanical thermostat on the ICE's electric water pump? Couldn't they just turn the pump on and off based on temperature sensor readings? Maybe they use it to allow flow through the 3 different paths?? It just seems like a potential waste of electric power for the pump to be running it all the time. Do you have any idea how much power that pump consumes?
Great question! The water pump is a variable speed brushless DC motor. Its rotational speed is independent of engine rpm now, so it actually reduces frictional losses that occur in belt-driven water pumps. The pump does not run constantly, its speed is based upon several factors (engine temperature, vehicle speed, and engine speed). I do not know how much current it draws, but the wires that feed it are pretty small. I will try to find out. Best wishes.
Thank you for the video. I was hoping that you would also explain how the heater for the interior work when the engine is not running. Or is it something you explain in a separated video?
That is amazing that a little grill shutter motor and sensor get their own microprocessor and thrown on the CAN bus. Dare I ask where you get information like "26 pieces of data..." from? I would guess that how all the modules communicate and what data they swap back and fourth is proprietary to Toyota and they don't want to share that? So with that information it seems you could connect to the CAN bus(es) and have fun with your car there, open/close vents and who knows what else? Are things like power mirrors, windows, headlights, etc on the CAN bus too? That is just amazing, thank you for the interesting video!
Thank you! Many of those items are on CAN busses now. I get my information from the service manuals. Toyota publishes a "New Car Features" supplement with all the cool technical details you would not normally find in the service information. Of course it is not free, you have to purchase it. Everything I have shared is available for anyone to purchase from Toyota. I read the information and summarize it in my own words in my videos. The 26 pieces of data I referred to can be read using a Toyota Techstream scan tool. Thanks for your feedback!
jontscott almost every little gadget is on the CAN bus these days. I, as an automotive technician, love that. Because I can actuate and test all these things with a click of a button on the computer. Makes diagnosis so much easier.
I guess I need to get a newer car so I can have more CAN bus around me :-) My '05 has CAN bus but nothing fun to control like lights, mirrors, fans, etc... just critical drive stuff.
jontscott you lucky guys with your fancy OBD-II systems! My family car is stuck in the world of OBD-II, and I'm stuck trying to find the equipment for it, for a reasonable price 😂
As always a perfect presentation I did have a question what is the voltage of the AC compressor motor - also would you know the voltage of the AC compressor on a Panamera Hybrid? Many Thanks Mike
I can't believe that it took until 2021 to get an automaker to install a heat pump instead just a plain AC system on their cars. this means that the engine does not have to provide heat to the cabin unless its really cold out, and thus, can operate more efficiently.
Those two cats are going to cost big bucks in Calif where no aftermarket cats are available or legal. On the 2016 up Prii, I would only keep the car until the warranty expired and I would make sure I got the additional Toyota Platinum warranty. I think you can still buy the Toyota warranty up until the first year of ownership and you don't have to buy it from the selling dealer. On my 2005, I bought a 7 year warranty for $1000 but not from my San Diego dealer. I got a deal from a Toyota dealer in Rexburg, Idaho!
Thank you for this educational video, I've recently got a 2020 Camry Hybrid and it's pretty similar to this model. I've got an off topic question about the vehicle approaching speaker. Is there a way make it louder with toyota techstream? Best regards from Austria
Sir. Any idea if these pumps and fan motors are brushed or brushless? Thanks Sir. You make great videos for us learning engineers to reference to. Awesome Stuff!!
Hi! I'm a big fan of your channel. THANKS for share your videos. I wanna ask from where you have the information of all the car, i mean, do you have the repair manual from toyota?
Does the Auris Hybrid 2017 have the same feature regarding preheat of ICE through the exhaust system? I have often wondered how it heats up the cabin so fast. Thanks for all the great videos.
Professor I have a question if I may. On the bottom of the Transmission where you have it labeled "Fluid Drain Plug" is for draining the Transmission Fluid? It does not specifically say so I wanted to ask. Also should I use ATF-WS Toyota Fluid I have a 2020 Prius Prim? Thanks
Interesting So on this 2017 Toyota Hybrid (vid) car has a "here I am" sound speaker mounted in the front grill to make a noise at very slow speeds. The Hybrids are sneaky quiet but our 2017 Camry Hybrid SE as it slows down make an electric motor type sound ( I thought) as its producing electrical power for the traction battery.. When backing up after a few seconds the gas engine starts up (at least I think its the engine starting up?) Just took a look and didn't see.a speaker device near the drivers side horn similar to the one in the vid? Like everyone else appreciate the Professor Kelly Weber Auto vids. Note: Four yrs old and 0 problems of any sort. .
Yeah it's going to be great one day you talk about GMC trucks you can hybrids about charging systems I understand this dcdc but I don't know where it's location
John - does the GEN 2 have an inverter cooler? A power split device fluid cooler? The WS fluid degrades with heat. Maybe that's why they have the cooler.
Yes, all four generations have inverter and transaxle stator coolers. There is a huge amount of heat generated when the inverter us under load. The Stators get very hot as well under load.
Hi Professor, I own a Prius Prime, and I think that this car you are working on. You called it an eco, and the car looks exactly like mine. Question, the coolant reservoir on the left keep emptying and I have steam or a mix of fuel and or oil, I’m not sure what it is exactly. Just billows of white thick smoke/steam but it lingers in the air. Toyota near me is unable to figure out what is wrong. They say the cylinders are holding pressure and there are not signs of burning coolant. The car seems to run fine...it’s just smoking and the coolant constantly drains within miles. Can you direct me to someone who can fix it for me? Toyota dealership near doesn’t know what’s wrong. Thanks for making this video. I really enjoy this vehicle. It is very reliable and is actually pretty quick in traffic. I made the mistake of seeing how long I can go on an oil change using Lucas synthetic oil stabilizer, 40k, but I’ll never do that again. I also only use non-ethanol fuel. I also decided to put in a K&N air filter on it and the engine just purrs. Even more quiet than it is stock and Toyota really did a great job on engineering these cars. The best Prius I have ever had the pleasure to drive and with a full charge and my additions, I used to get 72 mpg. Now though after 133k miles, I need to replace spark plugs and get it serviced. Thanks.
This one is not the Prime. That issue sounds pretty serious. The exhaust heat recovery system could be leaking exhaust into the cooling system causing that problem. Your coolant is probably going out the exhaust pipe. See ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-LTxGlUDcTDs.html
Professor Kelly, I have a question relating to coolant draining and bleeding procedure for a 2010 Prius base model. My local dealer in northern Virginia charges $200 to change the engine coolant and $200 to change the inverter/converter coolant. I'd like to do it myself. I haven't been able to locate any solid videos and/or instructions on how to do both properly. Based on watching this video of yours, which was incredibly well done, it concerns me that I don't have the proper professional level scan tool to force the water pump to the inverter to kick on to bleed it. If it wouldn't be too much of a bother for you, is it possible for you to recommend an educational source for a DIY mechanic showing how to change the engine and inverter/converter coolant and bleed both of them properly... without having to purchase a $20,000 Toyota scan tool? Many thanks professor. Regards, Steve.
So with the tank system now there is no longer pressure in the cooling system? Also dones not the heat exchanger on the transmission also help to heat up the transmission fluid quicker to reduce friction. Have noticed that my wife's new 2.4L accord that has one takes much longer to heat up the engine than my older 2.4 without on on its tranny. These may be why since not only the engine has to heat up.
There is still pressure in the cooling system. Yes, the heat exchanges on the transmission can also help it warm up more quickly. Thanks for your feedback!
Professor Kelly thank you for such a detailed description Can you please let us know why would Toyota use fans moving in opposite direction considering these will create more complex inventory management of 2 different parts that could be just one. There must be some technical requisite behind that. Thanks in advance.
