New Radiator & Now Ac Inoperative

[Zim]

94 SC400

140K

The plastic top of the radiator developed a crack. While the crack was developing I never noticed a hi temp on gauge. However, it was 95 deg weather and did notice the AC not as cold as before (thought it was low freon)). Had freon checked and it had about 35 lbs pressure.

Before taking it to the shop for radiator replacement I filled it with water for the drive over (by now the outside temp was 78 deg) and I stuck a digital thermometer in the center AC vent in the car and recorded 43 deg. Also, I turned the AC on and off ~ 5 times and the compressor clutch functioned normally - no noises.

Next I drove to the shop (10 min away) and the vent temp upon arrival at the shop is still 43 deg. Everything working normally.

Picked the car up last nite after a radiator change (outside air temp about 78 deg) and the AC is now inoperative. Clutch will not engage on compressor, therefore no AC. All fuses looked good (expecially close look at #2, 10, 20). All connections at or around radiator looked good, except for the low level sensor at the expansion tank. The black rubber cover will not cover the wires and stay in place. However, it was like this when I bought the car 1 month ago and the AC worked.

Is there some connector that the shop or I have overlooked that keeps the clutch from engaging? Or is the radiator temp somehow interconnected to the AC compressor and I have a bad sensor. Is there something the shop disconnected and failed to reconnect.

I just can't believe the AC worked fine immediately prior to the radiator change and immediately after the change it does not work. I am afraid the shop will say it is a bad compressor that "coincidentally" failed when they worked on it.

Any suggestions??

Thanks

Zim

EDIT

BTW - the AC button on the dash does NOT flash. It stays on steady.

Zim

[SKperformance]

Have someone press the a/c button to confirm the relay works.

It has to be wiring related as if it was mechanical such as the freon lines broken the clutch would still engage.

[Zim]

Have someone press the a/c button to confirm the relay works.

It has to be wiring related as if it was mechanical such as the freon lines broken the clutch would still engage.

←

Thanks for your comment.

Did hold in the AC button but clutch still did not engage. Do you know if the sensor at the bottom of the radiator have anything to do with the AC? Perhaps they damaged it or the wiring when changing out the radiator. Or is there any other radiator related sensor or wiring that has anything to do with the AC?

Thanks

Zim

[SKperformance]

Try the hvac test to see what error # it gives you.

i think i made it in the general maintainace section.