Question about Mercedes-Benz 350-Series

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I need to find the thermostat on my 91 mercededs 350sd. The vehicle was over heating due to a leak in a coolant hose. The hose has been replaced yet the car still overheats. The thermostat is my next best guess.

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First the thermostat is at the end of that top hose leading to the engine under that bulbus cover. Next ideas are this, A/C must be charged to let the low speed fan run, The strip fuse for the aux fan must not be blown for any speed fan to work and the temp cutout on the thermostat housing must be good to turn on the high speed of the fan.

Posted on Jul 07, 2009

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How do I determine why 2003 Pontiac Grand Prix blows no heat with step by step instructions?


The most common reason is the coolant is low.
Check coolant level when vehicle is cool.
If coolant is low start vehicle and fill radiator with coolant.
if coolant was needed high probability there is a leak
look at all cooling system hoses, thermostat housing, all over the engine to try and find leak and repair.

if coolant isnt low, make sure its not really dirty...reddish mud colored. If it is the radiator is probably clogged and needs to be flushed thoroughly..then refilled with coolant.

there will be two heater hoses coming out of firewall..they are connected to the heater core and one hose directs flow of coolant to the heater core, other hose directs flow away from heater core..start vehicle and run until engine is warm then feel each heater hose as close to the firewall as possible..if one hose is hot and other is cool..the heater core is clogged and will probably require replacement. also look in passenger floorboard if coolant is leaking there..heater core requires replacement.

if you check these things and find none of the issues, let me know, and I will tell you what to check next.
Good Luck with it and if you have any.question let me know

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Coolant leak in cabin - driver's side 2001 306 cabriolet - 2.0 16v


If you have a coolant leak in the car that is caused by a leak in the car's heating system - either the heater core or the associated hoses and connections.

Unfortunately to get at it is a PIA since it is behind the dashboard. A lazy fix is to stop coolant flow into the compartment and the leak will be gone along with the heat - bypass the heater hoses going to core .

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You'll have to get underneath the vehicle to see where the leak is coming from. If you can find the general area I might be able to help to narrow it down.

Do you have to add coolant to the engine from time to time?

To find the thermostat, follow the top radiator hose to where it connects to the engine, this is the thermostat housing. Remove the 2 bolts which hold it on and replace the thermostat.

** only do this on a cool/cold engine. Otherwise the hot coolant could cause sever injury.**

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1997 Cirrus is still overheating... The heater does not blow out hot air...would the heater core cause the vehicle to overheat? if not, what other problems am I looking for, I was loosing anti freeze...


it appears that you have a large air pocket/low on coolant. The engine is getting hot due to the lack of coolant but there is no heat because nothing is flowing through the core.

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1 Answer

1990 300c overheating. Are both electric fans supposed to come on? Any help would be appropriated. There is no coolant in oil or out the tail pipe as far as i can tell. Has hesitation. Temp keeps going...


I assume you have checked the cooling system to ensure that first, that it is completely full of coolant (not just the overflow tank) with no air locks and second that there are no leaks anywhere and the radiator cap is in good condition. The heater hoses and those pesky little bypass hoses in the cooling system tend to go hard and split if they are over 10 years old, allowing coolant loss. Those spring type hose clamps tend to be less effective in clamping as the hoses become hard. Worm drive ones are the best to use. Both cooling fans operate together on most larger cars.

If there are no leaks or air locks, the over heating could also be caused by a clogged radiator (more than 15% restriction in the radiator flow capacity will cause overheating problems), a faulty water pump or a faulty thermostat.

If there are no leaks and water pump and thermostat are working correctly, but undetected loss of coolant once the engine heats up, then it could indicate a problem with the head gasket (Usually caused by allowing engine to become excessively overheated when cooling system has run dry) allowing very hot high pressure combustion gases into the engine water jacket, which super heats the coolant in the engine block, which then boils off, and is released via the cap.

If unsure take vehicle to a cooling system specialist and have them do a pressure test and more thorough diagnosis.

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make sure your over flow/add coolant bottle is clean...check that the hose from bottle to radiator isnt clogged...also fill add bottle fluid level between add and full mark

Nov 15, 2009 | 1991 Honda Accord

1 Answer

My heat blow cold some body told me i need resistor on a 91 Buick regal unlimited where do i find it


the resister only changes the fan speed
if you have not heat
first check coolant level if it's down then you have a leak that will cause no heat if it's ok
then run the vehicle and make sure the engine temp gauge reads about half if not change the thermostat if the engine temp is ok
then grab the heater hoses see if they are hot then the heater core is plugged and if the heater hoses are hot
then there is a problem with the heater control head
hopr this helps

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1 Answer

I have a 91 corolla with 78,000 miles. I've been losing coolant with no obvious leaks. Heat from the vents is sometimes hot, sometimes cool. I've checked and changed oil, and there's no coolant in the oil....


have the system pressure tested for a few hours, if pressure drops and no leaks are found you may have a head gasket leak and the coolant is going out the tailpipe

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4 Answers

My 96 aurora keeps overheating and I already changed a leak I had in my heater hose. I believe the leak is coming from the left passenger side probably front or mid front.


It could be a faulty thermostate or a bad water pump. Water pump is on the passneger side where the fan belts are. Good luck

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