Question about 1997 Mercedes-Benz C-Class

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How to restart the AC compressor

Service station filled freon but AC remains hot - it was suggested that it needs a computer restart from a dealer. Some other way

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When you start the car with the ac off go under the hood and look at the ac compressor. Look at it good and you will see the clutch is not spinning. Now go in the car and turn the ac on max, when you go under the hood again I will bet the clutch is still not spinning. If you feel comfortable you can unplug the wire that plugs in to the compressor and make a jumper wire that goes to the battery and engage the clutch that way, this would ensure the clutch is good if it engages. Other way is to start checking fuses and relays. I haven't heard of having to reset the computer from havin ac serviced. I work in a shop that does this knid of work.

Hope this helps

Posted on Jun 28, 2009

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Unhook the battery for 1 minute.

Posted on Jun 28, 2009

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Ac problems


Either connection is bad to low pressure sensor or pressure sensor is faulty.

Jun 22, 2014 | 1997 Cadillac DeVille

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Do I have to change my compressor? This is my 3rd freon refill. A 230E '99 MB.


no you do not need a new compressor; take your car to an ac shop and, make sure they change the fill valves (they look like oversized tire valves inside the compressor where the freon lines attach (after time the o-rings fail in these and, they leak refrigerant; obviously your dealer has an incompetent ac mechanic or. these should have been inspected and, if having failed: replaced.

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Problem with ac blowing hot air on a 2002 ford mustang gt


Low or no freon. Bad compressor. If its low, find the leak, repair, evacuate and recharge with oil and freon. CLEAN Freon. NOT a quick fill with sealant. That will do damage the system.

You can jump the compressor without having the key on. Run a jumper wire from the positive post of the battery to the single wire plug for the clutch. If it clicks, find an AC shop and have it checked for leaks and repair.

Aug 11, 2012 | Cars & Trucks

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My A/C compressor shuts off after an hour (sometimes longer) of driving on a hot day.


I would get it checked by another mechanic shop, I suggest a complete AC service with freon, oil and dye every 5 years... The oil keep the compressor lubricated.... Also, there is always a 10-15% tolerance level in freon amount to be filled in. Auto compressor shut off is a built in safety feature that kicks in when pressure is too high in the system..... If you are in OC,Socal, let me know

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2005 ford explorer ac compressor not turning on


The most common cause is a lack of refrigerant. Most systems require a minimum of 2lbs of refrigerant to make the compressor engage. This is a precaution to prevent burning out your compressor. There are leak detection/refill kits available at most auto parts stores. There are also many service stations that are certified in automobile AC systems. Keep in mind, by law, service stations are required to search for and repair leaks prior to recharging your system.

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A/C is blowing hot air. Freon is full, compressor


Not sure how you know if the freon is full without the unit running. There are a number of switches which can keep your A/C from coming on. There is a low pressure switch which is usually located on the larger line and sometimes located on a silver cannister (called an accumulator) which is the low side of a compressor circuit. There is also a high pressure cutout which is usually located on the back of the compressor unit. Both of these switches can be jumpered out to see if they are the reason for the compressor not working. You remove the two wire connector to either switch and place a small jumper wire between the two wires on the connector block. The other reason my be a low idle cutout switch and this will also usually be located near on on the compressor. You can also test it the same way as the other switches. If it is the low pressure switch then of course you will need to add freon which you can purchase from any auto parts store. They usually come with instructions and all the equipment needed to add in freon. If it is high pressure, then some of the freon should be recovered from the system by a technician. If is the low idle cutout then you will have to take it to a mechanic to understand why it is idling so low. Hope this helps.

Jul 16, 2010 | 2004 Kia Sedona

1 Answer

My ac wont get cool.......it blows hot air and(caddy seville 95)


Below is a guide to troubleshoot and check system function. This can be done by most folks.

Look at the front of the ac compressor and have someone turn on the ac from inside the car. The front of the pulley(clutch) will spin when turned on.

If it does not spin, the low pressure switch (LPS) is not satisfied. Meaning there is not enough freon in the system to operate the system. Means low freon capicity because of a leak.

The LPS can be jumpered to cause the compressor to run (clutch to engaged) which will draw the freon in the system.

The LPS is usually a two wire sensor on the suction of the compressor. (between evaporator and compressor) Unplug the sensor and install a jumper, this will engage the clutch. Connect a new can of freon
and fill to system capacity.

The capacity of the ac system will be on a label under the hood, do not overfill. Probably about 2 lbs. Local parts stores (Auto Zone and Advance) will have freon with stop leak. This may help the leak. They also make a freon with a UV dye. I always add a single can with dye so that if stop leak does not work I can find the leak in the future.

The system should be filled until suction pressure is about 30 to 38 psi..

Remember the flow for the a/c system is :
1. From the compressor a high pressure (HP) gas goes to the condenser in front of the radiator.
2. From the condenser a HP liquid goes to an expansion device (orifice tube or expansion valve)
3. From expansion device the low pressure gas enters the firewall to the evaporator.
4. From evaporator the low pressure liquid/gas mixture goes through the dryer2_bing.gif back to the compressor suction.

May 29, 2010 | 1995 Cadillac Seville

1 Answer

I have a 1998 GMC Jimmy & there's no power going to my low pressure switch which is located on the accumulator. I ran a hot wire from the battery to the ac compressor, filled the system with 1.8lbs of...


Running a hot wire bypasses any compressor cycling. Low side should pull down to 20 psi or less when compressor is hot wired. If not pulling down you may have weak compressor or way to much freon in system.

Jul 14, 2009 | 1998 Chevrolet Cavalier

1 Answer

AC still blows hot air


CYCLING COMPRESSOR COULD MEAN TOO MUCH OR TOO LITTLE FREON.TAKE IT TO AN A/C SHOP

May 07, 2009 | 2002 Mercury Sable

1 Answer

1998 ford explorer a/c and heater wont work


You lost the Freon again, because you probably only fill up Freon last winter, you didn’t check the leak and fix it,

You have to check the AC belt, compressor, AC clutch, condenser ( see the small glass window to find out if there is some bubbling, if your Ac has bubbling, you need fill up Freon.

Jun 30, 2008 | 1998 Ford Explorer

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