Question about 1991 Mercedes-Benz E-Class

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Mercedes 300 e 1991 AC problem

I have two problems, first is where is the cabin filter and how can i clean it?\r\nsecond is my compressor make sound like grggrgrgrgrgrgrgrgrgrgr if you start it but it's give cold by 60% what is the problem?

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The clutch on the ac compressor is not making good contact. replace compessor with clutch and reciever drier.have system flushed.

Posted on May 13, 2009

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If the system is running right, a quick check is to see if the cold side of the compressor lines are sweating/condensation. Then most likely the system is good. The A/C filter, called a dryer, isn't changed unless you have a catastrophic compressor failure, ie lots of metal in the lines. The cabin air filter has nothing to do with the A/C system. Assuming you have a good system and not getting cool air inside the cabin. The blend door motor is bad or it could be just unplugged. These are usually locate under the dash, in front of the console, on the drivers side. Some times on the passenger side. I do many makes and models of cars, So I can't tell you exactly where yours is. Hope this helps.

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Check drain and unclog if required.
Remove air cabin filter (see you tube for instructions). Make sure it is done in a clean place so no dust or dirt gets in while you do this.
Block Air Cabin filter opening with duct tape.
Set fan to 50% (3/4), temperature to minimum
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Open hood and using a Spray bottle, spray half a bottle of Alcohol 70% into the air intake vents at bottom of windshield
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I have a 2003 toyota corolla. My AC would blow cold air for a min or two then when the compressor shut off it would no longer blow cold air or come back on. A new compressor was put in it but it did not...


the ac clutch relay is the problem. It is located in the under hood fuse box. It is a $10 part. The relay will make a clicking sound when activated but the contacts inside are burnt causing no electrical flow to the ac compressor. Simply unplug and replace. The relay is labeled M/G CLT .

replace or blow out the cabin air filter as well. It is located behind the glove box. Instructions are in your owners manual.

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start by cleaning or replacing your in cabin air filter. check to see if your AC condenser fan is turning when the AC is turned on. Make sure the front of the radiator is not clogged with bugs, mud, etc. Check AC compressor relay-make sure the compressor clutch is turning the compressor with engine at idle. lastly check for proper refrigerant charge.

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I Have A Mercedes Benz E40 2002 AC Compressor Is Not Turning On But A Mechanic Checked It Once And Compressor Is Good And No Licks Is Founded What you Think Its The Problem?


The compressor is not turning due to the clutch is not engaged. The clutch is only engaged after a total check from the controller then a signal is generated to turn on the clutch. This is a series of sensor check to meet the requirement. It means you have to check: The refrigerant pressure switch check to make sure there is enogh coolant, The coolant sensor -if it signal too hot, clutch not engaged, The speed sensor from the back of compressor to compare the speed of of the camshaft to prevent the compressor looked up, The sensor at the evaporator, if it is bad, it senses too cold then the clutch will not engage, The sensor near the reading lights to check cabin temperature... All these make the AC repair for this car is expensive, and not any one can fix the AC in this kind of car. Don't try to find any local repairman to attempt the fix, since it ends up costing you more than what it needs to be. Good luck.

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Are you sure it has one. Go to your local Advance Auto Parts store and ask for a Purolator Cabin Filter. If they sell you one it comes with detailed instructions.

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My a.c. unit under the hood is cycling cold but I am not getting any cold air in the car. It appears to be blowing outside air in the car. why?


Hi,
It turns out the cars thermostat is sticking, as the engine gets hotter, the ac kicked out. Some sort of sensor turns off unnecessary stuff (like the compressor) to save it. I changed the thermostat, and no more problems. Let the car sit in your driveway idling, ac on. If the ac goes off, spray the radiator with water, and see if comes back on; then it's the thermostat. Another possible thing could be this air filter (cabin filter) is clogged. Usually it is located in the plastic duct work in the car behind the glove box. The filter was put in newer cars to filter out pollen, etc. getting into your car. I would check the cabin filter first. Either blow it out with compressed air to clean it, or leave it out. A new filter runs about $40 and it's a dealership item
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Well Bruno it sounds like you lost freon from your a/c system.The cabin filter wont restrict you from getting cold air.Check that your a/c clutch engages when you turn it on.if it dont you need freon and have to check for leaks

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1991 Mercedes 300E, low air volumn in cabin from AC


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