Marcel4t

I have an issue where when accelerating from a stop AC blows warm for a while. Also takes forever to get cool up on cold start. Blows cold at highway speeds. I hooked up some gauges to see what was going on. 90* with a feels like of 100*. Low side seems high and high side seems low. I also noticed that the low side pressure rises a lot when revving engine up (95psi). I'll attach pics of idle pressures. I tried to upload the pressure when I rev up the motor but it won't upload.

ILM-NC G37S

iTrader: (3)

Are the fans running? 90% of all AC issues with these cars can be attributed to the fans or dirt/ debris clogging the radiator/ condenser fins.

Marcel4t

Thanks, yeah, I thought about the fans, and they are running. But maybe they shut on and off and I dont know?? How would I be able to tell? Do you think my pressures are OK or something wrong with them?

ILM-NC G37S

iTrader: (3)

This post will show you how to run the IPDM/er self-test which tests the fans. BOTH fans, during this test, should run at 50% duty (medium) for 5-seconds, then "ramp up" to 100% duty (full-speed) for a additional 5-seconds. At full speed they should BOTH be roaring loud and moving a ton of air.

With the AC set to 60 (MAX cooling) the fans should be at 100% with the car idling.

I will let others chime in on the pressure gauge readings.

SkysG37

The IDPM turns the AC clutch off under acceleration, right?
But not the blower fan(s)
And the heater core is always hot, so maybe look at the blend door
I installed high temp shut off valves to keep my heater core isolated. Helped cab temps tremendously.
olated.so did ditching the cats and wrapping the headers

ILM-NC G37S

iTrader: (3)

Not exactly. The ECU/ IPDM/er only turns the compressor OFF under the following conditions:


Under normal acceleration the comoressor remains engaged.

Every indication, based on OP's symptoms, leads me to suspect insufficient airflow across the radiator/ condenser.