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Ever see a comp behave like this?

pippo on Tue September 11, 2012 7:57 PM User is offline

Year: 1984
Make: ford
Model: f150
Refrigerant Type: r12
Pressure Low: 45
Pressure High: 190

People,

helped a friend fix his ac- we put in freon, and got cold ac!! But, the mystery is the comp- its acting soooo funny- the clutch clicks on for 3 seconds, and then shuts off for 3 seconds, then repeats over and over!! I first thought needs a new comp, but, hey, we're getting cold ac!! Whats up with this clutch? How can a comp deliver high psi with clutch engaging for only a few seconds, then disengaging like that? Was this a Ford thing?

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beware of the arrival

pippo on Tue September 11, 2012 7:59 PM User is offline

actually, going from memory- clutch may only be engaging for even less than 3 seconds. May even be just 1-2 seconds. Man..........(scratching 3 day old beard stubble, curious.....)

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beware of the arrival

GM Tech on Tue September 11, 2012 9:05 PM User is offline

Possibly overcharged- and you have got high pressure cut-outs-- but your gage set does not show it due to the location of yor gage port relative to the hpco switch..

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Edited: Tue September 11, 2012 at 9:06 PM by GM Tech

mk378 on Tue September 11, 2012 9:31 PM User is offline

What's your ambient temperature? In low ambient temperature a CCOT will cycle a lot because there isn't much need for cooling. It's hard to test any system properly below about 75 F. You could try jumping the low side switch -- if it still cycles it is something like GM Tech said, if it runs constantly and the air gets even colder you have a triggerhappy low side switch that needs to be replaced. Don't jumper the high side switch of course.

Edited: Tue September 11, 2012 at 9:35 PM by mk378

pippo on Thu September 13, 2012 3:07 PM User is offline

Strange- I thought I replied here last night, but Oh well, lemme try it again...

Ambient temp was about 75, come to think of it- it was at altitude of about 6000 feet, and near dusk, so couldnt be that warm. Maybe thats it, huh mk?
Thanks,Man.

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beware of the arrival

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