7 symptoms of bad radiator cap 

The best explanation of bad Radiator Cap.

Best explanation of the function and symptoms of a bad radiator cap.

I would have never guessed a radiator cap can go bad. My heat would not get very hot and the car would blow cool air when the heat is on. So I got a new radiator cap and everything is back to normal. Thanks so much.

ITS amazing what one little cap does

Great video. Thanks!

Great explanation and thank you....also your doing a great job👍

Full of necessary information. thank you for sharing!!

While driving, I noticed my temp gauge go much higher than normal, close to red zone. I turned my heater on and gauge went back to normal. I pulled over, opened hood, and noticed reservoir was full with boiling water. I assumed it was the thermostat, so I replaced it, but it happened again. I let the car cool down and opened up radiator. The rubber or plastic on the radiator cap had deteriorated into a coarse black dust. Cleaned off all that black dust, replaced cap, and no more problems. All that time and work replacing thermostat when it was a bad cap. That's what I get for assuming and not troubleshooting. I should have squeezed the hose going from engine to radiator to eliminate the thermostat.

Thanks so much. This was perfect!

This is an excellent video. Well done!

Straight to the point

The radiator cap is underrated and often forgotten. I change mine at 60K mile intervals with an OEM one. It costs a few dollars more but if you divide the time into the price, it is a fantastic bargain.

very well explained and very helpful!! thank you!!

Great..thank you very much

My seal is over the edge on my rad cap. I have noticed that my reservoir bubbles like coolant is being forced into it. It is not overflowing but has bubbles. It also appears that a little coolant is coming from the cap itself. It is a 2015 Jeep wrangler. Cap is definitely needing to be replaced.

Thank you.

Awesome vid mate

thank you . excellent explanation.

Very Educative video.

Great content!

Great video!!!

Good video

solid! thanks

Great vid bro thanks

My car over heats and fan starts to run as soon as i turn on my car and i hear water sound inside the cabin while accelerating.

good description

Interesting

What's the condition of the first outer rubber sealent if the radiator cap is going bad? Soft or hard? And same question for the 2nd inner rubber sealent.

You are the best

Very informative video on the workings of a radiator cap. Thank you sir. Just a point of note, lot of radiator caps do not function like the factory originals as most sellers out there sell some cheap China made caps and they are not rated accordingly. I'm finding it hard to get the originals these days.

exactly what i needed to know..........

Is a radiator cap responsible for losing the amount of coolant from the radiator? My coolant has been loosing in big amount even if I drive even for a short distance but there is no leakage in radiator neither in water pump.

I need help plzz my 2016 Nissan Altima sr has a overflow tank and it’s not boiling or nothing but it’s overflow

Nice teaching

Replace you cap when you replace your thermostat. Problems solved

Useful 👍

Damn crickets in the back

Radiator fluid was leaking from the cap, i went and brought another one but it still leaks from the cap

I bought 2 new radiator cap , vacuum valve is without any spring,is it something wrong?? my radiator for 1.5cc car replaced by 1.6 cc ,is it o k ?

Hi I have a question My cars gauge goes really high and I believe its overheating .I place some Radiator Coolant to the Reservior .Then after that it drains my Fluids I put in the Reservior .I already replace the Thermostat in my Car . And still the temperature still going high and I run my OBD reader 2 and it finds a P0115 which is Engine Coolant Temperature Sensor 1 Circuit . I bought a new Temperature Sensor but still its leaking fluids in the Reservior tje temperature gauge go higher . A good advice would be beneficial for me .

👍

Sir you forgot .. if the coolant cannot return back to radiator because return valve stuck cause build up of coolant in reserve tank

Radiator cap is also bad when the overflow pipe next to the cap is leaking?

I'm gona have a heart attack if my problem is the cap...I just put new water pump...radiator...heater valve...I know parts can be faulty...but sheesh...got a new cap...didn't think It could be bad...gona try new cap...hoping this works...don't think it's my head gasket...I overlooked just bout everything

Well Explained - The other day I drove my car for more than a week, when stop at shopping centre RED Temperature light appeared on my Dashboard I checked the Reservoir completely empty also the radiator took about a litre & half of water. I did not drive again until yesterday and Red light appeared Radiator took over 2 litres of water. Got the Road Side Assistant out he said he does not think its the head casket as the car starts with no problem, he could not see any leaks under neath the motor / on the ground. How do I put the Coolant in the Radiator, if there is still some water inside and do I have to mix the coolant. I have a 4 litre of Distilled water. Please help no $$$ I'm a 74 year old Pensioner. John

.. Well no, dont go get just any radiator cap but the one rated for the proper PSI.

I'm sorry but I don't understand what he is saying bc his accent is so thick.