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at a loss air conditioning

medinapops on Thu September 13, 2007 1:36 AM User is offline

Year: 1986
Make: pontiac
Model: fiero
Engine Size: 2.8
Refrigerant Type: 134
Ambient Temp: ?
Pressure Low: ?
Pressure High: ?
Country of Origin: United States

I have converted from r12 to 134 when I first got this car the compressor would run for a while then the compressor would stall and the belt would lock up then work for a while. then lock up again. I replaced the compressor, accumulator, orifice tube, converted it to 134. flushed the system. and it does the same thing. I did not replace the High & low pressure switch on the compressor I used the same one off the old compressor. The condenser has plenty of air volume. I'm at a lose on what to try next.

Kenneth Bishop

Chick on Thu September 13, 2007 5:50 AM User is offlineView users profile

What are the pressures, High and low along with the outrside temp taken at..did you pull a deep vacuum and charge into the vacuum? How much refrigerant did you put in? Did you use sealers? or other additives, or just oil and R134a? Need to know everything you did in order to help you.

Email: Chick


Freedoms just another word for nothing left to lose

medinapops on Fri September 14, 2007 10:00 AM User is offline

A friend of mine has an auto shop and used a machine to automatically vacuumed & charge the system told me he charged it for the minimum charge. I did not use any additive. I just used oil and r134A.

Kenneth Bishop

2POINTautO on Fri September 14, 2007 10:04 AM User is offlineView users profile

Get Chick's info for all of us as soon as you can please sir.

Give all the dirty details
and dont forget the LO & HI pressures
Year, Make & Model would be nice too

iceman2555 on Fri September 14, 2007 11:53 AM User is offlineView users profile

Without pressures....both high and low....when the lock up occurs...not when the system is operational......but best a high pressure lock up....the compressor can not pump against the excessive pressure..hence the lock up....pressures are reduced...operation resumes....pressure build up.....and the process begins all over.
It is quite possible the compressor is not locking up....the pressure begins to build...compressor begins to labor...the belt being the weakest point begins to slip. If this has occurred more than once....the belt becomes glazed and it is much easier for the slippage to occur. My books indicate a single groove pulley for this unit...???...belt tension is very important....

The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

NickD on Fri September 14, 2007 1:11 PM User is offline

Listed vehicle is a Fiero that was problematic from the start with the engine in the rear and the condenser way in the front and some very long hoses running underneath. Cooling with R-12 can be best described as marginal, but setting that aside, nothing was mentioned about changing the accumulator to a R-134a unit. Sounds like you have limited resources for AC testing, but can try to hand turn the compressor hub when the engine is off and cold several times to learn if you can detect any binds. I kind of remember a V-belt driven compressor, but wouldn't even bet a half a cup of coffee on that, was about 19 years ago. I do remember, it wasn't a very easy car to work on.

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