96 850 Turbo: is there are relationship between a bad cooling thermostat and AC functionality?

[insession]

Since is slightly off topic, I'm going to post this as a new thread with appropriate topic

[abscate]

See if you have 12 volts on one side of the plug at the low pressure switch with the ac switch on and the temp controls set to the blue dots , fan on. That will tell you if the ECC control unit is commanding the compressor on

[insession]

Thanks absacte, will try tomorrow! Not 100% sure what you mean by 'on one side of the plug at the low pressure switch'. I assume you mean one of the two wires going into the low pressure sensor close to the firewall?
As I said, I've jumped those two wires - no compressor engagement.

And, since it was a bit off topic here, I've posted it as it's own thread:
viewtopic.php?p=595978#p595978

[abscate]

You need 12 volts at the compressor to pull the clutch in. The best way to troubleshoot stuff is start at the component and work backwards, looking for voltage.

Some compressors have thermal switches which can cut off the voltage ftom heat, or fail themselves

[insession]

Lost faith, taking to shop tomorrow, will post what is being found

[insession]

Turns out it was electrical. One of the wire to the high pressure switch by the firewall had broken inside its insulation a half a foot from the sensor. Visually uncheckable since it was inside one of those black plastic ribbed protective hoses. Sigh. But, glad it's working again!!

Of course another possibility is that the shop screwed something up during the r&r of the radiator, ECT and temp sensor, and to cover their asses, they now presented me with a alleged problem that's untraceable

Peter