96 850 A/C switch problem. Keeps sparking?!?

nctlspider · Post by **nctlspider** » 02 Mar 2008, 13:46

When i bought this car, the blue light on the a/c switch would never come on. So i took it out and it seemed nothing was wrong. The orange REC light would come on and i could here the motor moving the door under the passengers dash. SO yesterday i decide to look at the switch again and i see that the circuit board has one copper section that blew. Manual climate control by the way.

No problem, i get some coil wire and jumper to match the broken contacts. I plug it in and the LED sparks off, burning one of the little legs in half. I twist them together, turn it on again. Same thing. Figuring there is something wrong in the board, i use alligator clips to try and recreate the wiring scenario

Violet/yellow- Hot
Black- ground
Green/yellow - assuming the a/c relay
brown/yellow - the REC door

So i run the violet to green, and nothing. I then add black to either one and i become an arc welder.

WHAT should this be doing? Why can i not figure this out? I Don't want to buy a new switch and burn it too. Any suggestions? I just wanna see if the compressor will spin. Is there a way to do this without the relay? i have been on the Search engine all day, no luck. thanks

Cory

Post by **Ozark Lee** » 02 Mar 2008, 14:38

Jumpering the Green/Yellow wire with the Yellow/Violet wire should simulate the A/C switch being on.

If it still acts up try pulling the A/C relay - it may have an issue.

If you want to hot wire the compressor on jumper the switch wires as described above and then jumper the A/C relay socket positions associated with terminals number 30 and 87. From there it goes to a pressure switch and then on to the compressor.

The A/C switch itself is a high failure item.

...Lee

nctlspider · Post by **nctlspider** » 02 Mar 2008, 20:54

Thanks Lee.

I will have to wait till next weekend to look at this again, since I have BIG tests this week before spring break. I didn't think adding the ground into the equation was correct, but looking at the circuit board it looked right. THe relays work when i switch them both into the fan spot. One is grn and one is blue. The wiring diagram on the side makes them look the same, with different part numbers. I suppose next i'll check the pressure switches and clutch gap.

Does anyone know a place other than the dealer for the a/c switch?

thanks

Cory

Post by **MadeInJapan** » 02 Mar 2008, 21:15

Cory,
eBay has these all the time. Just be patient if one isn't on there...it will turn up. Otherwise, you might try www.erievovo.com (call them as they don't answer email).