Highway A/C Cutting out
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Joined: Jun 2004
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Highway A/C Cutting out
I have a 98 Eddie Bauer Expy and it's A/C has started to cut out whenever I hit highway speeds. No cold air at all. When I turned off the Interstate and stopped at a red light, the A/C started blowing cold again. Right up until I hit 70+ mph.
I just purchased it a month ago and have never had it on the highway until then. Any ideas??
I just purchased it a month ago and have never had it on the highway until then. Any ideas??
Junior User
Joined: May 2004
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I know that on some vehicles (not sure about Expy) that the AC compressor will dis-engage if the engine revs go above a certain RPM (say 3500). I believe there is a clutch that controls this action and it could be faulty, (if the expy does the same thing) disengaging at a lower RPM than it should.
Just another thing to consider, although I would look at refrigerant level first.
Glock
Just another thing to consider, although I would look at refrigerant level first.
Glock
Postmaster
Joined: Jan 2003
Posts: 4,417
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From: Durham, NC
I think it is a freon charge problem also. At highway speeds, with the compressor at a higher RPM, the pressure on the suction side is going too low, and the low pressure cutout switch is opening. One other thing to remember, there is a WOT compressor cutout relay also, that the PCM controls, from the TPS.
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Ok.....now it has cut out completely and there is a rattling noise (like chains across concrete) whenever I have the HVAC controls in ANY setting other than Panel/Floor; that goes for in motion or at a stop
Senior User
Joined: Jan 2003
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From: Tucson
Low pressure is my guess. At highway speed the ram air through the condensor is cooling with greater efficency and causeing the pressure to drop. There is a pressure switch on the reciever dryer that can normally be jumped with a paperclip to troubleshoot this. Try half a can and see what you get.
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Senior User
Joined: Jan 2003
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From: Tucson
Sorry didn't see your second post, never mind my last. Only guess there is low charge may have burned up compressor bearings. If you have a leak in the system the oil that lubes the compressor can leak as well.
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