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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Posted on Jan 02, 2017

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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.

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When engine completely cools remove coolant from overflow reservoir to the cold mark on the reservoir which is the lowest mark on reservoir. If you continue to loose coolant you may have busted block.

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


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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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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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