New control/scroll valve was the first thing I did, didnt help.

My apologies for the misleading thread title. I don't see an option to change the title. I'll see if I can get a mod to adjust it.

atikovi wrote:

satvue wrote:If I hold the throttle down at 1500rpm, temp immediately drops, I let off temp immediately goes back up.

That's opposite of what you say in your title.

Do you typically only read thread titles?

Changed out the highside switch, no change. If I hold the throttle down at 1500rpm, temp immediately drops, I let off temp immediately goes back up. Any other ideas?

The sensor is on the high side line someplace. AC Delco part number 1551343 Again, a Mitchell subscription can be a big help. You can screen shot the wiring diagrams & save them, that alone is worth the $20 charge https://eautorepair.net/Marketing/Default.asp I'll give the Mitchell subscription...

I've tried 2 remanufactured compressors and one labeled NEW, all same results. I put a new scroll valve in the initial compressor hoping that was the issue, no dice.

The high side is a 3 wire pressure transducer that feeds high side pressure information to the PCM. The PCM makes the fan speed decision. It is not a simple switch, and is not adjustable. It is a 5 volt input, with a 1 to 4.5v output. The sensor could be bad, or the wiring to the sensor. The high s...

I'm almost positive it fan related, they both run but always on what I would consider low. If i pull the relay for the low speed fan they stop, but the high speed relay does nothing. How would I adjust the high pressure side to kick the fans into high? Appreciate the help.

The fans should change speed depending on cooling load. This is normally decided by refrigerant pressure & ambient temperature. A few questions: Have you owned this car since it was new? I've owned it since 2009 When was the last time you changed the cabin air filter? I honestly didn't realize ...

I meant to ask in my original post, the radiator fans are running but always at a the same speed (no high or low). Any chance there's a resistor that has went bad not kicking the fans to high? I"m grasping at straws...