Whats an A/C Heat Switch? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Low69CST · 06-01-2002, 10:59 PM

My painless wiring manual keeps talking about running wires to this switch, but what and where is it?

Also, is the A/C controls supposed to have 1 or 2 lights? my harness only has 1 and the controls have 2 holes.

Low69CST · 06-02-2002, 12:30 PM

ttt

Hutch · 06-02-2002, 12:50 PM

The A/C control has two lights and the wire is gray.

I have three of these controls and one has no lights, one has one light, and the other has two lights.

I am planning to wire mine up with two lights, but like you I might have to add another bulb and socket.

I have also noticed that one of the vacuum switches has three lines two it and the other two have just two.

As far as the switch that they are referring to I would think that that would be the compressor switch that is located on the back side of the diverter box at the end of the cable for the diverter flap.
What color and how many wires are there for the switch?

Low69CST · 06-02-2002, 01:38 PM

The wire is black with white stripes. Its not the switch on the back of the diverter box. The wire is used twice in the wiring. Once its included in the plug that goes to the fan switch (the manual says it comes from the fuse pannel to the A/C Heat Switch). Then another wire, the same color says it comes from the compressor and should connected to the A/C heat switch. Well, since one wire is included in the fan switch plug, does this mean that this A/C heat switch is part of the fan switch, and the 2nd wire the is supposed to go to the A/C heat switch should be spliced into this other wire in the fan switch plug? If it is, why didn't painless do it?

This is a pretty nice harness, but their instructions and tech help sucks.

Hutch · 06-02-2002, 02:05 PM

I would not think that you should have to splice the wire.
My compressor has two wires attached to the clutch plate and one is a short frame ground and the other is green and goes through the firewall.

Where does this black and white wire terminate You stated that one end is on the dash side of the firewall near the a/c control and the other end is?

I have seen a few wireing diagrams posted from others that have helped me a lot when troublshouting various electrical issues.

06-01-2002, 10:59 PM	#1
Low69CST Registered User Join Date: May 2000 Location: Frankfort, Kentucky, USA Posts: 2,163	Whats an A/C Heat Switch? My painless wiring manual keeps talking about running wires to this switch, but what and where is it? Also, is the A/C controls supposed to have 1 or 2 lights? my harness only has 1 and the controls have 2 holes. __________________ '69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks

06-02-2002, 12:30 PM	#2
Low69CST Registered User Join Date: May 2000 Location: Frankfort, Kentucky, USA Posts: 2,163	ttt __________________ '69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks

06-02-2002, 12:50 PM	#3
Hutch Registered User Join Date: Oct 2001 Location: Grapevine, Tx. Posts: 2,142	The A/C control has two lights and the wire is gray. I have three of these controls and one has no lights, one has one light, and the other has two lights. I am planning to wire mine up with two lights, but like you I might have to add another bulb and socket. I have also noticed that one of the vacuum switches has three lines two it and the other two have just two. As far as the switch that they are referring to I would think that that would be the compressor switch that is located on the back side of the diverter box at the end of the cable for the diverter flap. What color and how many wires are there for the switch? __________________ John Hutchison Grapevine,Texas 68 1/2 t swb 68 Mustang 69 Jaguar 71 1/2 t swb 88 Supra CompTs6m 93 Escort GT 2005 Corolla XRS

06-02-2002, 01:38 PM	#4
Low69CST Registered User Join Date: May 2000 Location: Frankfort, Kentucky, USA Posts: 2,163	The wire is black with white stripes. Its not the switch on the back of the diverter box. The wire is used twice in the wiring. Once its included in the plug that goes to the fan switch (the manual says it comes from the fuse pannel to the A/C Heat Switch). Then another wire, the same color says it comes from the compressor and should connected to the A/C heat switch. Well, since one wire is included in the fan switch plug, does this mean that this A/C heat switch is part of the fan switch, and the 2nd wire the is supposed to go to the A/C heat switch should be spliced into this other wire in the fan switch plug? If it is, why didn't painless do it? This is a pretty nice harness, but their instructions and tech help sucks. __________________ '69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks

06-02-2002, 02:05 PM	#5
Hutch Registered User Join Date: Oct 2001 Location: Grapevine, Tx. Posts: 2,142	I would not think that you should have to splice the wire. My compressor has two wires attached to the clutch plate and one is a short frame ground and the other is green and goes through the firewall. Where does this black and white wire terminate You stated that one end is on the dash side of the firewall near the a/c control and the other end is? I have seen a few wireing diagrams posted from others that have helped me a lot when troublshouting various electrical issues. __________________ John Hutchison Grapevine,Texas 68 1/2 t swb 68 Mustang 69 Jaguar 71 1/2 t swb 88 Supra CompTs6m 93 Escort GT 2005 Corolla XRS

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