A/C electrical issues
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Joined: Aug 2005
Posts: 2
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A/C electrical issues
My girlfriend has a 98 3.8L, and the air conditioning stopped working one day awhile back. I finally got around to tracing the electrical system with the help of a service manual CD. Everything appears to point to the constant control relay module being bad. The fans and fuel pump work fine, so I know the ground is good on it. Pins 21 and 22 have +12V on them, so pin 23 is supposed to have +12V as well. This is the output to the a/c clutch field coil, but it just sits at .13V whether the a/c switch is on or off. When I connect +12V to pin 23, the a/c works and blows really cold. I found a junkyard specializing in Ford parts here and got a replacement from a 97 3.8L today. When I installed it, though, I had the same problem. There is the possibility that the replacement module has the same problem, but I do not know how common CCRM failure is on these cars. More than likely, it is probably something else in the electrical system, but I have been unable to locate anything so far. Any ideas?
6th Gear Member
Joined: May 2005
Posts: 7,445
From:
RE: A/C electrical issues
ORIGINAL: Physics
My girlfriend has a 98 3.8L, and the air conditioning stopped working one day awhile back. I finally got around to tracing the electrical system with the help of a service manual CD. Everything appears to point to the constant control relay module being bad. The fans and fuel pump work fine, so I know the ground is good on it. Pins 21 and 22 have +12V on them, so pin 23 is supposed to have +12V as well. This is the output to the a/c clutch field coil, but it just sits at .13V whether the a/c switch is on or off. When I connect +12V to pin 23, the a/c works and blows really cold. I found a junkyard specializing in Ford parts here and got a replacement from a 97 3.8L today. When I installed it, though, I had the same problem. There is the possibility that the replacement module has the same problem, but I do not know how common CCRM failure is on these cars. More than likely, it is probably something else in the electrical system, but I have been unable to locate anything so far. Any ideas?
My girlfriend has a 98 3.8L, and the air conditioning stopped working one day awhile back. I finally got around to tracing the electrical system with the help of a service manual CD. Everything appears to point to the constant control relay module being bad. The fans and fuel pump work fine, so I know the ground is good on it. Pins 21 and 22 have +12V on them, so pin 23 is supposed to have +12V as well. This is the output to the a/c clutch field coil, but it just sits at .13V whether the a/c switch is on or off. When I connect +12V to pin 23, the a/c works and blows really cold. I found a junkyard specializing in Ford parts here and got a replacement from a 97 3.8L today. When I installed it, though, I had the same problem. There is the possibility that the replacement module has the same problem, but I do not know how common CCRM failure is on these cars. More than likely, it is probably something else in the electrical system, but I have been unable to locate anything so far. Any ideas?
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