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1992 Mercedes 300E M103 -Replacing Thermostat For Summer Heat!

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So teaching my son how to replace the thermostat on his 300E,
due to really hot temperatures coming up during the summer here, we install a 75c (167F)thermostat , it helps the engine run cooler.
During wintertime we put the stock 87c(188F thermostat back in.
Coolant to use is Zerex G5 it protects aluminum parts and its color is clear brown.

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29 авг 2024

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Комментарии : 22

@rommelpena9397 Год назад

I made the modification to put a teflon plug under the thermostat, this prevents the HOT water that comes out of the engine from going down the pump and re-entering the engine. and finally remove the thermostat permanently so that the water that comes out of the engine goes up without obstacles towards the radiator. since I live in a very hot area.

@ebutuoyebutouy Год назад

Thanks for sharing. Be aware that most new cars have electrically controlled thermostats $$$$ controlled by the ECU. For light duty (civilized) driving they allow temp to go way up. If engine is heavier loaded or the ECU detects pinging temp is immediately dropped. Better efficiency when temps are higher. Also for best thermal transfer minimize the amount of antifreeze.

@mygermancars7264 Год назад

I'm pretty old school , my newest car is 2006 Lincoln, all my cars are easy to fix and not complicated, new cars are cool and lots of tech, for me to buy one I would have to invest lots of money on really good code scanners etc , can be done but lots of nightmares when things go wrong , mechanics charge so much for things nowadays, as long as I can fix them myself I'll keep them! only thing I would send out for repair are transmissions, to much work on those.

@mygermancars7264 Год назад

Hey thanks man , eventually I'll have to learn new tech, may have alzheimer's by then lol.

@User0player1 Год назад

Headers look very posh!

@rommelpena9397 Год назад

yo hice la modificación de poner un tapón de teflón debajo del termostato, esto evita que el agua que sale del motor baje hacia abajo de la bomba y vuelva a ingresar al motor. y finalmete quite el termostato definitivamente para que el agua que sale del motor suba sin obscaculos hacia el radiador. ya que vivo en una zona muy caliente.

@dikranberg7600 Год назад

❤❤❤❤😊😊😊

@danishnauman2167 11 месяцев назад

Hello. I am having trouble removing the thermostat housing. I have removed all 3 bolts but the housing seems to be stuck.

@mygermancars7264 11 месяцев назад

Tap it lightly with robber hammer or use piece of wood to it with hammer. .

@danishnauman2167 11 месяцев назад

I will try that. Thank you!

@w124mercedes7 Год назад

Do you know if there is a 75 deg thermostat that will fit 1987 mercedes 300d turbo diesel om603

@mygermancars7264 Год назад

No I don't, best thing to do is join a W124 forum for diesels and ask them.

@Alex-im6yf Год назад

What’s the part number for the lower temp thermostat?

@mygermancars7264 Год назад

This is what I bought, says Wahler on it, its a 75c , its for a 79 450SL but fits my car. amzn.to/3omiU9d

@Alex-im6yf Год назад

@@mygermancars7264 Thanks for the help! Between this and the exhaust gasket trick you have saved my rear!

@451dcramer Год назад

How significant was your decrease in fuel economy? I’m considering putting a 79 degree in my car.

@mygermancars7264 Год назад

During very hot months I don't think it makes a difference, during winter 87c goes back in, optimum running temps for best MPG is 87c, these cars just run hot during summer time, lots of complaints on this issue, we may ditch the whole system and upgrade to electric fan system, protect the head gasket!

@451dcramer Год назад

@@mygermancars7264 Thanks! I just put in the 79 degree last night. I live in the Bay Area so during summer I can be anywhere from 60 to 100 plus depending on where I am. Fan clutch refill is next.

@mygermancars7264 Год назад

@@451dcramer Good luck , good part is where you live compared to the blistering heat of Temecula , still after spending 1K on all the cooling parts I could have ditched existing system and spent $350 for electric fan set up, these 6 cylinder cars do not like excessive heat, probably why they suffer head gasket failures. My son was a a drive thru the other night and waiting in line temp was at the 100 mark, thats 212F.

@451dcramer Год назад

@@mygermancars7264 I’ve also been looking into an electric fan conversion/fan clutch delete. Unfortunately I have a M104 and the consensus seems to be that there simply isn’t enough room between the engine and radiator.