Question about 1985 Mercedes-Benz 300

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Engine running hotter than usual

Recently changed thermostat (got from Mercedes dealer)...car is now running hotter than before...not overheating just hotter...coolant is fine...any suggestions?

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  • Jay Glendenning
    Jay Glendenning May 11, 2010

    Did the dealer possibly give a "hotter" thermostat than what you had in originally?

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  • 75 Answers

First check your axillary fan for function,if change your thermostat element look at the bottom you can see what degrees open the element,you can buy element with lower degrees.axillary fan working,first stage when aircon is on.

Posted on Feb 19, 2009

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Posted on Jan 02, 2017

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Where do you live?
This has been a hot summer, bit hotter than usual due to the solar flares going on...
as long as the pointer stays within normal operating range, you must not worry... especially since you changed the thermostat and did a flush, did you make sure you got the right temperature range thermostat installed, rarely but few times that seems to be the problem, hotter thermostat gets installed by mistake.

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Please see my tip at http://www.fixya.com/cars/r5929960-s_thermostat . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

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I have a 2006 Xterra and heater just blows cold air and the service engine soon light is on. Just happen I came in from work everything works fine but 8 hours later my heater/defroster just blows cold air....


It could be your thermostat inside your radiator hose. They are a common thing to fail, but luckily relatively cheap and easy to DIY with some automotive background.

Thermostats usually work with a spring that allow them to have a closed "door" while your car is still cold working its way to optimum operating temperature. (Usually around 200°F depending on vehicle. You can check with a parts store for your thermostats rating) Once hot the thermostat opens to keep the engine from continuing to get hotter to the point of overheating.
When a therm. gets stuck in the open then your vehicle will usually not allow cabin heat in efforts of keeping emissions down. Cold running engines produce more hydrocarbons = not environmentally friendly.
This could also trigger a code that could set your check engine light. Before you go changing anything you should stop at an auto part shop where they can check what codes are stored for free. Codes aren't black and white though so do some research after as well.

A bad thermostat would set codes such as

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hello ,seems your thermostat element should be checked and locate your leaking problem,using a radiator tester could help you easily,also check your oil for contamination due for overheating,ty

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1 Answer

Car running hotter then usual


sounds like wrong temperature range thermostat , or new defect , i only use stant thermostat , also double check coolant level , almost always air traps after coolant service

Feb 19, 2009 | 1985 Mercedes-Benz 300

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