Question about 1991 Mercedes-Benz 300 Diesel

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1991 mercedes 300 sel. i just flushed out the coolant and added new coolant. heater now doesnt work.

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  • Mercedes-Benz Master
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Aux heater valve by the battery area my have crapped out on you.

Posted on May 19, 2010

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1 Answer

I flushed out the coolant in my 91 Toyota Mr2 and Added new coolant and its not going threw and car and over hearing how do fix?


Did you do a coolant flush because it was overheating?
Sounds to me like you have a bad thermostat.

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Where are the relays located at in 1991 Mercedes Benz 300 SEL ?


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I drive a 1991 mercedes 560 sel and i want to change the stereo in it. The only problem is the wires that i need to connect to the new deck are not colour coded the same way the instructions are for the...


see if the store that sold you the radio has a wire adaptor kit. they are available for most american/japanese cars so i would think a mercedes one should be available.makes easy work out of the job

Apr 21, 2010 | 1991 Mercedes-Benz 560

1 Answer

Where is the pollen filter locatedon a 300 te 4matic the heater only blows cold air there are no visable leaks


1989?' it doesnt have a pollen filter that i know off ,cold air ?' remove the feed hoses and flush the heater rad reversing the direction a few times ,dont forget to put antifreeze back in ,100% is best

Jan 12, 2010 | 1989 Mercedes-Benz 300-Class

1 Answer

1991 Mercedes Blinker and hazzard lights light up but don't blink


Needs a New Flasher. This is located in the center console somewhat near the ashtray.

Jan 04, 2010 | 1991 Mercedes-Benz 420

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1980 mercedes 300cd. The heater blows cold. It has a brand new servo unit. The recirculation pump is works when hot wired. All new hoses and clamps.The vacuum heater valve is operational. I am ready to...


Check you have coolant flow to the heater core - feel the inlet and outlet coolant hose as near as possible to the heater core- they should be both be hot and approx equal in temperature.
If the outlet hose is noticably colder you may have a blocked heater core ( a reverse flush with water from garden hose may fix it).
Check the cooling system has been properly filled, with the heater coolant valve open, bleeding off any airlocks as required.
Check any cold/hot air re-direction vane within the cab heater air ducting is operating properly (not seized or stuck).

Oct 27, 2009 | Mercedes-Benz 300-Class Cars & Trucks

1 Answer

Removing int door skin 1990 300 sel. the rear window guide/retainer has broken


start from bottom and pull. remove any screws that might be holding the panel on the door first they may be covered by little plastic caps. then work your way up around the edges. be sure to disconnect any swtches befor u pull the cover all the way off. then push the hole panel up.

Aug 15, 2009 | 1991 Mercedes-Benz 300 Diesel

1 Answer

Broken heater


I know this is an old post. Has the problem been corrected? If so I am sorry no one took the time to assist you here. If you are still having this problem I would like to help. Let me know.

Oct 31, 2008 | 1991 Mercedes-Benz E-Class

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