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- Newsgroups: rec.autos.tech
- Path: sparky!uunet!psinntp!newstand.syr.edu!mothra.syr.EDU!ravalent
- From: ravalent@mothra.syr.EDU (Bob Valentine)
- Subject: Re: Defogger and A/C compressor question
- Message-ID: <1992Dec16.032023.956@newstand.syr.edu>
- Organization: Syracuse University, Syracuse, NY
- References: <FRAZER.92Dec14141757@ired460a.erim.org>
- Distribution: usa
- Date: Wed, 16 Dec 92 03:20:22 EST
- Lines: 52
-
- In article <FRAZER.92Dec14141757@ired460a.erim.org> frazer@ired460a.erim.org (Matt Frazer) writes:
- >Hi,
- > I recently inherited a 1986 Plymouth Horizon. It only has 25K actual
- >miles - a real life case of the little old lady who only drove it to
- >church on Sundays. It's in pretty good condition, but lack of use seems
- >to have taken its toll too. One thing I have noticed is that when I turn
- >on the defogger, there is a clicking sound. This car has A/C, and I found
- >that the noise is from the compressor clutch engaging, then immediately
- >disengaging. This sure doesn't seem right. The constant cycling on and off
- >has got to be tough on the compressor, and it sure doesn't sound good on
- >that little engine either.
-
- The A/C system has probably lost some charge. They're a pressure
- switch somewhere in the system. If you remove the connector, jumper
- it, and the problem disappears, then you know the problem. NOTE:
- Don't do this permanantly, it WILL damage the system. Even better,
- get the pressure guage for A/C systems. It'll tell ya in a jiffy.
-
- > Could it possibly be the battery? I'm going to replace the all-but-dead
- >battery next week. I'm thinking that if the compressor is controlled by a
- >relay, when the engine rpms drop due to the compressor load, the battery
- >voltage is not high enough to keep the relay engaged... Just a shot in
- >the dark. Any other explanations would be appreciated.
-
- Doubt the battery is causeing the AC problem.
-
- > Another simpler question I have regards engine run-on. As I said, this
- >car was driven by a little old lady. It was probably never driven over
- >35MPH. Would this be the most likely cause of the terrible case of engine
- >run-on it has? What's the best remedy for this?
-
- Sounds like goo in the carb, if so equiped. Solutions are to
- either remove the carb and clean, or just a tank full of gas with a
- shitload of carb cleaner in it. Then go beat the hell out of it for
- a few miles. It could also be wrong spark plugs or just plain old
- sparkplugs.
-
- > Thanks in advance for any help.
-
- You're welcome.
-
- Matt Frazer
- > frazer@erim.org
-
-
- --> Bob Valentine <--
- --> ravalent@mailbox.syr.edu <--
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