Mechanics

AC SOMETIMES WORKS AND SOMETIMES DOESN'T!

2002 SEAT Ibiza

Air Conditioning problem
2002 SEAT Ibiza 4 cyl Front Wheel Drive Manual 75000 miles

My AC works fine when the temperature outside is not to hot. When the weather temperature is under 90 °f the AC works fine, in fact I plug a pressure guage at the high terminal of the ac system, and it was about 300 psi, but when the weather temperature is over 100 °F the AC system start to fail, it works and then stops. The pressure in the high terminal rises over 390 psi and then it stops. When it cools down, the pressure falls and the it starts again, but the pressure raises again and it stops once again. My car has two fans for the radiator and the ac system, and they work fine,
So what could be the problem. I appreciate your help. Thank you.
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Lex lopez
June 1, 2009.



Thats way too much pressure. The safety pressure switch is shutting the system down to prevent damage. You need to check your low side pressure. It should be around 40 psi idling with a/c on, low side should be around 225.

Tiny
Jack42
Jun 2, 2009.
My low side is about 35 psi with a/c on.

As you said the safety pressure swith is shutting the system down. Some time before I almost discharged all the system out of gas, and the pressure in high terminal still was very high. What can be happening?

Thanks for your help.

Tiny
Lex lopez
Jun 2, 2009.
Sounds like some kind of restriction. Check the orifice tube, could be the expansion valve too

Tiny
Jack42
Jun 2, 2009.