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Car Forum / Jeep / April 20072005 Grand Cherokee heater fan control failure
On my 2005 (of course out of warranty) Grand Cherokee, I'm experiencing intermittent failure of the HVAC fan low speed circuit and, it appears the HVAC compressor clutch activation. It won't work for a while, then, it "heals" itself. I see in the owners' manual that there are 2 relays and 1 fuse associated with HVAC controls, I'm betting on one of the relays......would this indicate an overload of some kind? Any suggestions would be appreciated! Thanks, Don Hi Don, Yup, it's been the relay on the ones I've played with. I don't remember two, the other must be a heat sensor. It sure boils over instantly doesn't it? God Bless America, Bill O|||||||O mailto:LWHughes3rd@aol.com http://www.billhughes.com/ > On my 2005 (of course out of warranty) Grand Cherokee, I'm experiencing > intermittent failure of the HVAC fan low speed circuit and, it appears the [quoted text clipped - 10 lines] > > Don  SignaturePosted via a free Usenet account from http://www.teranews.com Bill, I think you're talking about the aux fan that lives out by the grille and radiator, but I thought the OP was complaining of the fan that lives inside the cabin. > Hi Don, > Yup, it's been the relay on the ones I've played with. I don't remember [quoted text clipped - 18 lines] >> >> Don Yes, apparently I didn't read the subject line. Thanks. God Bless America, Bill O|||||||O mailto:LWHughes3rd@aol.com http://www.billhughes.com/ > Bill, > I think you're talking about the aux fan that lives out by the grille and > radiator, but I thought the OP was complaining of the fan that lives inside > the cabin. SignaturePosted via a free Usenet account from http://www.teranews.com The fan should work independently of the AC compressor. I'm not sure what you are complaining about, the fan or the compressor. > On my 2005 (of course out of warranty) Grand Cherokee, I'm experiencing > intermittent failure of the HVAC fan low speed circuit and, it appears the [quoted text clipped - 10 lines] > > Don Hi Don, Air-conditioning compressor normally cycles off and on. There are both a high pressure and low pressure safety switches that are designed to save the pump if one happens. You may be low on Refrigerant R134a, that may be checked with a gauge: http://www.billhughes.com/temp/r12gauge.jpg The low side should read a little higher than R12. This real should be done by a licensed tech. God Bless America, Bill O|||||||O mailto:LWHughes3rd@aol.com > On my 2005 (of course out of warranty) Grand Cherokee, I'm experiencing > intermittent failure of the HVAC fan low speed circuit and, it appears the [quoted text clipped - 10 lines] > > Don SignaturePosted via a free Usenet account from http://www.teranews.com a scan for fault codes would be the best first step then you would have a better idea whats up > On my 2005 (of course out of warranty) Grand Cherokee, I'm experiencing > intermittent failure of the HVAC fan low speed circuit and, it appears the [quoted text clipped - 10 lines] > > Don > a scan for fault codes would be the best first step then you would > have a better idea whats up [quoted text clipped - 9 lines] >> >> Any suggestions would be appreciated! The compressor clutch will disengage if the system is under or over pressure. Check the electrical connectors on the pump (high side limit) and the accumulator (low side limit) and make sure they are clean. SignatureDougW |
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