Ac compressor cuts out when stopping. will not kick back in untill you start going and get the engine rpms around 2500 -3000 under a load. when you get up to speed and drop the rpms cuts back out. stop and shut off engine approx. 45 sec. restart kicks in, until you start driving and the rpms drop

SOURCE: engine almost stalling when ac is turned on

you may have a faulyt IAC sensor not idling up enging when a/c is on

SOURCE: ac blow warm air at

Refrigerant Leak and low on
ref.

Have to fix leak first

Do not try to work on A/C yourself,
or add to system,need a shop that
does A/C work

SOURCE: i have 96 vw jetta

That would be the high speed oil pressure sensor telling you there is a problem with your oil pressure.Your computer is reading insufficient oil pressure to maintain engine integrity above 2000RPM.
There are 2 oil sending units mounted on top of the oil filter housing. I don't have wiring for your year so I can't tell you for sure, but on my 1992 they are brown ( low pressure) and white (high pressure). Check the wiring carefully for cracks or bare spots in the insulation and fix any you find. Also make sure the wiring is good at the plug-ins. VW wiring won't tolerate cracks and often will break right where it meets the plug-in. Also if you have recently moved these wires you may have plugged them in wrong. I would most definately get the pressure checked with a mechanical oil pressure guage to be sure of the pressure. If it's good, 29 PSI at 2000 RPM then I would be looking at a bad sending unit. Hope this helps.

Testimonial: "wow! thank you so much!! it was going to be $90 just to find out what the prob was/diagnostic! I sooo can't afford that as single mom w/3 kids!!! "

Jeffery Lewis

• 329 Answers
• Posted on Jul 02, 2011

SOURCE: our 2001 V70 -AC shuts

The A/C needs to be serviced by a certified volvo tech or some one who know's a/c very well it can be just low charge or the speed sensor on the compressor.

Stephen

• 21873 Answers
• Posted on Jul 24, 2012

SOURCE: compressor and fans do not turn on until rev engine

I passed this question the first time I read it, so I will take a stab at it now.
The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch.
I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ?
Speeding up the engine would increase voltage from the alternator.
This is assuming the serpentine belt is tight and everything else is working correctly.
I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.