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Pressures all wonky

bkbarnes on Mon June 23, 2008 8:29 PM User is offline

Year: 1988
Make: Ford
Model: F150 4X4
Engine Size: 351
Refrigerant Type: R134
Ambient Temp: 92
Pressure Low: 75
Pressure High: 260
Country of Origin: United States

Ok, so here is the story. A couple of years ago I had my 88 F150 changed from R12 to R134a by a shop in town. New compressor along with dryer reciever. It worked great for about 200 mi then the front seal on the compressor blew out so had them put another compressor on it and that worked great (very cold) for probably another 200 mi and it started cycling on and off allot then the clutch went out. They replaced the clutch, hit me with labor ofcourse, and the process repeated again. By now the unit is out of warranty (its been about 2 years and I don't drive it too much) so I decided to tackle it myself and put on another clutch. Ofcourse it immediatly startet cycling allot (about every 5sec.) so I called the shop up to get some guidance and he told me too just put another can in, so I did without really checking the gauges and the cycling stopped. Thought I was good and drove about 30 mi. and it starts cycling again and I turned it off. So, today I put gauges on it and static pressures are Low 80 and High 130 ( I thought they were supposed to be the same) I didn't check the static when I first went out but that is what it is right now and the vehicle has been off for about 30min. Running pressures are
Low 75 High 260 ambient is 92. I have no idea where to start.


bigkev on Mon June 23, 2008 8:38 PM User is offline

new compressor? Next time buy a real new compressor. Dont get a second rate rebuild from a chain store and ask your mechanic not either. Put some dye in it and find out where your leak is also, you probably got a bunch of air in through the leak.

chris142 on Mon June 23, 2008 9:30 PM User is offline

Any shop that tells you to "Put another can in" are complete boneheads. Find another shop.

Chick on Tue June 24, 2008 6:44 AM User is offlineView users profile

You have a leak, and your compressor may be on the way out. But I would evacuate, recharge properly (might have air in the system now) add some UV dye, and see if the pressure return to normal, that will tell you if the compressor is toast. I agree, find another shop...Hope this helps..

Email: Chick


Freedoms just another word for nothing left to lose

bkbarnes on Tue June 24, 2008 12:59 PM User is offline

Thanks very much, I will do that. Is there a way to save the 134 that is currently in there without having a fancy recovery setup?. Or, I guess if there is moisture in the system I wouldn't want to put it back in anyway huh?

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