Author Topic: A/C wiring (Read 4624 times)

Zulfiqar · « **on:** December 29, 2007, 06:29:57 am »

I want to wire the high temp cutout switch located in the front coolant flange to make the entire thing operate like VW intended, I know its for A/C as it states 107 degrees C, The A/C harness from the cabin has 3 wires in it,

1X red - batt
1Xwhite/red going to connector to front of car - Cut from middle of harness underbattery
1Xgreen/white - going to AC comp and also spliced into rad fan with a diode (mech shop did it)

I have this VW wiring diagram but it shows different wire colours.

Anyone chime in because the wires to the 2 pin switch are not in any harness

And while at it what relay is the A/C high temp cutoff relay

Ziptar · « **Reply #1 on:** December 29, 2007, 06:46:29 am »

What year and model car??

Zulfiqar · « **Reply #2 on:** December 29, 2007, 08:42:48 am »

1986 golfC 1.6 NA (with factory AC)

Zulfiqar · « **Reply #3 on:** December 31, 2007, 07:42:01 am »

Anyone???

Can someone walk me through this A/C wiring schematic, like where would I find the A/C high pressure switch wire for the high speed relay. (Ive ghetto rigged it by running an additional wire to it.

jtanguay · « **Reply #4 on:** December 31, 2007, 01:07:39 pm »

the high speed switch should be located on the high pressure hose going to the condensor. there's a high temp switch and a low pressure switch. compressor will not run on low pressure, and the high temp switch kicks the rad van into high speed mode.

is that what you mean?

Zulfiqar · « **Reply #5 on:** December 31, 2007, 01:21:34 pm »

OK - figured that out so far, and Ive placed the missing high speed fan relay on the inner fender with a self tapping screw

Theres another switch on the coolant flange in front of the head btw #4 and #3 cylinders, its 2 pins, I couldnt find any wires to connect it to, the wiring schematic I have shows that I should be connecting a wire and a ground to it. It goes to the A/C cutout relay (solidstate), which I cant find at all anywhere. Should this relay be something in the engine room or the relay panel under the dash.

jtanguay · « **Reply #6 on:** December 31, 2007, 07:25:41 pm »

Quote from: "Zulfiqar"

OK - figured that out so far, and Ive placed the missing high speed fan relay on the inner fender with a self tapping screw

Theres another switch on the coolant flange in front of the head btw #4 and #3 cylinders, its 2 pins, I couldnt find any wires to connect it to, the wiring schematic I have shows that I should be connecting a wire and a ground to it. It goes to the A/C cutout relay (solidstate), which I cant find at all anywhere. Should this relay be something in the engine room or the relay panel under the dash.

for the coolant flange in front of the head if i'm nto mistaken thats the temp sender. it could also be the afterrun switch though..

Zulfiqar · « **Reply #7 on:** January 01, 2008, 02:25:56 am »

the coolant flange in the front of the head has the temp sender unit also and a large two pin switch which is a NO switch, Ive asked around and it definitely is the A/C cutoff switch for factory A/C cars

jtanguay · « **Reply #8 on:** January 01, 2008, 03:53:15 am »

Quote from: "Zulfiqar"

the coolant flange in the front of the head has the temp sender unit also and a large two pin switch which is a NO switch, Ive asked around and it definitely is the A/C cutoff switch for factory A/C cars

oh yea in case of the coolant getting too hot because of the a/c system

Zulfiqar · « **Reply #9 on:** January 01, 2008, 10:44:15 am »

found the switch wires, they were neatly tucked in the harness beside the battery by the nutjob who previously messed the wiring, its grn/wht and brn going to relay # 43 on fuse panel.

also found the original red pwr wire for the rad fan and h/speed relay- now still looking for the high speed trigger wire blk/yel it doesnt seem to exist,

is it a direct connection from the switch from the high pressure metal hose resting on the fan shroud considering its so near the relay