AC setup in GENIV swap into 1997 Tahoe

[GasGuzzler]

On the 97 you have a cycling switch on the accumulator (receiver/dryer). This opens when the pressure on the low side is too low. Most from this era use 12 volts through this switch in the relay engage circuit. The switch in the back of the compressor opens when high side pressure gets too high. Not sure what the third is (although I know it's not the cycling switch). I cannot use GM service info for non-engine wiring on anything older than 98 so I'll have to look it up tomorrow to see what you mean.

Either way you should be able to temporarily hot wire the pressure cycling switch to get compressor operation. The main problem is the way the 07 makes enabling decisions.

[harascho]

Hi.. and I thought the cycling switch is on top of the '97 compressor on the hose connection block?

For sure the high pressure cutout switch is in the back of the compressor.

As far as I read the pressure switch on the receiver / drier is the low pressure cutout switch....??

hmmmm

Harald

[harascho]

On the 97 you have a cycling switch on the accumulator (receiver/dryer). This opens when the pressure on the low side is too low. Most from this era use 12 volts through this switch in the relay engage circuit. The switch in the back of the compressor opens when high side pressure gets too high. Not sure what the third is (although I know it's not the cycling switch). I cannot use GM service info for non-engine wiring on anything older than 98 so I'll have to look it up tomorrow to see what you mean.

Either way you should be able to temporarily hot wire the pressure cycling switch to get compressor operation. The main problem is the way the 07 makes enabling decisions.

What do the '98 / '99 schematics say.... it should be basicly the same setup...

Yes you are correct.. to get the system running correct the AC request signal is necessary on the CAN bus....

Harald