20 Most Recent 1986 Mercedes-Benz 300 Questions & Answers

Hi,first of all worm the car up to running tempriture,put your hand on the water pipe that is coming from the fermastate is it hot if so try the one at the bottom of the radiater to see if that is hot if that is hot then the radiater is fine,nexst turn engine off,then undo the oil cap to see if your oil has a musterd colour for oil if oil is ok,then you will have to do a compresion test to see if there is one of your cylinders has low compresion. some times you can have a broken head gasket which can couse uneven running due to water going into the cylinder. I hope its not bad and a easy fix this is just to give you food for thought,best of luck.

most likely dirty switches or bad fuses. Try rotating fuses and then try moving them again. Corrosion on the fuses cause "gremlins" in the system. If not find a junkyard and pull out a set of used switches or try autohausaz.com for new replacements.

did you plug it into laptop to check if sensors is right?

in the gas tank.

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First your ac comp has a clutch. second r 12 and r134 are NOT compatible if you just "add a pound of r134" you will kill your entire ac system. The O rings, dryer and pressure switches are not interchangeable nether are the lubricants and you WILL burn up your ac comp. Just a word or caution. It is probably the ac speed sensor to detect slip.

Worn ujoint?? worn pinon gear in rear end? idle set to high,or trans itself. does it klunk from 1st to reverse or all shifts...all shifts i'd guess transmission..

As far as I know you only have to change the compressor and dryer-filter to comply with 134a. Other components from old Freon 12 are safe to use for 134a. There's an Urban (mechanics) legend that you can use a 134a to an r12 system, but you can't use an r12 to a newer 134a system. But be on the safe side, change the compressor and dryer to use 134a or ask an expert on refrigeration.

go to http://www.automecanico.com/auto2002/avanzada.htmltranslate to english, and sear for your model.God bless you

They are on the harmonic damper ring on the front of the engine.