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- Path: sparky!uunet!spool.mu.edu!uwm.edu!rutgers!spcvxb!hsh!lee
- From: lee@hsh.com (Lee Havemann)
- Newsgroups: rec.autos.tech
- Subject: Re: Defogger and A/C compressor question
- Message-ID: <1992Dec15.171240.372@hsh.com>
- Date: 15 Dec 92 21:12:40 GMT
- References: <FRAZER.92Dec14141757@ired460a.erim.org>
- Distribution: usa
- Organization: HSH Associates
- Lines: 42
-
- 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.
- > 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.
-
- The car probably needs a recharge - most (all?) newer cars have a pressure
- sensing switch on the AC which cuts power to the compressor clutch if the
- system is undercharged.
-
- >
- > 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?
-
- Probably has a bad case of carbon build up - the car was never revved up past
- 3000 rpm, and the enging gets full of crap. Fill it up with some good gas,
- take it out on the highway, and romp on it for a while.
-
- >
- > Thanks in advance for any help.
- > Matt Frazer
- > frazer@erim.org
-
- --
-
- Lee Havemann, Sys_op HSH Associates (201) 838-3330
- Internet: lee@hsh.com Compuserve: 70410,3507 AOL: HSH Assoc
- "Any opinions expressed are not necessarily those of anyone else,
- including myself."
-