1996 ford escort 1.9lx 5spd in question.

I've had a catastrophic a/c failure and decided to replace EVERYTHING BUT EVAPORATOR (it was only flushed), and so I did.

When hooked up it was running at 30-40 low end and 350+ high end on idle. When driving or under throttle it would surge above 400 and turn off.

My hypothesis was that there was too much of something in there even though we followed instructions to the letter. So I had him take out 0.5lbs of refrigerant and it still ran at 350psi. So it definetly is NOT TOO much oil/refrigerant.

My mechanic suggested we replace the compressor with a new one (i had bought a remanufactured one). I was hesitant but said what the heck, can't argue with the guy since THEY are the mechanics.
We put a new one in after flushing all the new lines again. Same thing happened. High end pressure was ~380 under idle and above 400 when driving or under throttle.

Mechanic thought the condenser was bad and checked it for cold/hot spots but it turned out fine. Now we are out of ideas.

Anyone have any ideas? Clues? Same thing happen to them?

Also, what does the high pressure transducer do? Is its function to only shut off the compressor under high pressures or does it actually control/maintain the pressure?

Thanks.

 

The normal cause of exceedingly high pressure readings is due to air flow thru the radiator. Is your radiator fins clean and free from debris? This is a common and most often overlooked area. Also, is your cooling fan coming on as soon as the A/C compressor engages? The coolong fan should come on as soon as the A/C compressor engages. Normally it will come on in the low speed position, if need as temperatures require, it will come on in the high speed position, or step up from low to high.

 

The fan is working fine.