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Discussion Starter #1
Hi,

I've searched to find a solution for the newest problem troubling my 95 c280, but haven't made much progress. Currently, my 202 has a bypass switch installed on the two auxiliary fans in front of the radiator (identical to the one mentioned by jnenad) that completely bypass any connected relay. I bypassed them because I noticed my car was overheating in the Texas summers and that the auxiliary fans would turn on and off at will. From my understanding, these only come on under certain specific conditions. I never quite found a solution to the problem, thats why I bypassed the system.

This worked for quite some time, keeping my engine cooler but now, a year later, I came to turn my A/C on and the cold air would only last a few seconds. It appears as though the compressor now turns and off intermittently., along with the cold air.

I have checked that there is enough freon in the system, and I believe the clutch does engage properly. I have read that the A/C system is somehow interconnected to this fan relay, but I'm not sure if it could cause this problem somehow so much further down the road. I've also read that low radiator fluid could also cause A/C woes.

I don't physically have the vehicle with me at the moment as my mechanic is searching frantically for a solution, but I don't think he'll figure this one out. Also, he did say the car threw out a number of codes when tested.

If anyone has had this similar intermittent A/C or fan problem or could help me out in any way, i would be forever grateful because the texas sun is not as forgiving.

Zade
 

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1998 c230 170K
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What are the codes?

Hi,

I've searched to find a solution for the newest problem troubling my 95 c280, but haven't made much progress. Currently, my 202 has a bypass switch installed on the two auxiliary fans in front of the radiator (identical to the one mentioned by jnenad) that completely bypass any connected relay. I bypassed them because I noticed my car was overheating in the Texas summers and that the auxiliary fans would turn on and off at will. From my understanding, these only come on under certain specific conditions. I never quite found a solution to the problem, thats why I bypassed the system.

This worked for quite some time, keeping my engine cooler but now, a year later, I came to turn my A/C on and the cold air would only last a few seconds. It appears as though the compressor now turns and off intermittently., along with the cold air.

I have checked that there is enough freon in the system, and I believe the clutch does engage properly. I have read that the A/C system is somehow interconnected to this fan relay, but I'm not sure if it could cause this problem somehow so much further down the road. I've also read that low radiator fluid could also cause A/C woes.

I don't physically have the vehicle with me at the moment as my mechanic is searching frantically for a solution, but I don't think he'll figure this one out. Also, he did say the car threw out a number of codes when tested.

If anyone has had this similar intermittent A/C or fan problem or could help me out in any way, i would be forever grateful because the texas sun is not as forgiving.

Zade
I am sure we all want to know the codes before answering;)
I'll take a shot in the dark even though you don't have the car onhand.
It sounds like you may have faulty aux fan switch but if the water temp sensor is faulty then then it would defer a signal for the fans to kick in, the aux fans don't come on until the engine reaches a certain temp.
I would advice if you have not done so already to drain the radiator, flush the system and replace the thermostat. Your mechanic should be able to ohm test the water temp sensor for correct values.
Have your mechanic check the high and low side readings of the a/c system while its running, this will give you a insight to what is going on, may be just a pound low on fridge or a restriction in the system such as a reciever drier. B
 

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Discussion Starter #3
Okay, well I got the car back today and the mechanic said that the A/C actually only turns on once and will blow cold air for about 2-3 minutes before it turns off. It will only blow cold again once the car has been restarted. He also said that they refilled the system with freon, applied vacuum, tested the compressor several times and even checked the speed sensor. The compressor works fine, and he was under the impression it was an electrical problem.

I do recall in the vehicle's record book that the engine wiring harness has been replaced previously, and I'm thinking there may be a short somewhere. My mechanic also told me that the engine threw just about every code possible. I would like to check the codes myself, so i'll go ahead and search the forum on how to do this and post the results shortly.

Thanks again
 

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Discussion Starter #4
I tried to get the codes several times just to make sure I got them all and this is the list I compiled..

25
59
END

26*
28*
60*
78*
80*
82*
86*
90*
94*
98*
102*
106*
END


:(
 
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