Lifetime Premium Member
Join Date: Mar 2005
Location: Jeannette Pa. near pittsburgh
Re: Heater resistor plug
The 70-72 Chevelles with factory A/C have a STAND ALONE wiring harness. It enters the dash above the Dist. Also What ever under dash and under hood harness you are using.
You need the SAME YEAR - A/C harness. Whats the big deal !
I built a driver it is a 1971 Nomad Wagon with factory A/C. I installed a green 70 SS Dash, With the 70 under dash harnsee and a 70 under hood harness.
NOW I am driving the car and want to get the A/C working.. CLUE:
1971 Chevelles with Fac. A/C have relays under the glove box. 1970 Chevelles with Fac. A/C -DO NOT. Now I am having an OH SH!T Moment.
I enjoy working on A/C, I have done it for years. YES,,,, You can make anything work if you have the time money and knowhow.
Just to keep it all FACTORY and have all the wiring the same. I installed a 1970 A/C wiring harness.
NOTE: 1971 Chevelles with A/C. After the key is shut off and in your hand...... LISTEN.... You will hear a click.... What is it?
My 1971 Nomad wagon with a 307 and A/C. Like I said " After the Ign. is shut off and the key is in your hand, You will hear a click? "
This click is a relay under the glove box (with the key in your hand) It sends 12 Vts. to ENGAGE the A/C Clutch to Load down the engine, WHY?
This EXTRA LOAD on the engine without the Ign. on, Acts as a "ANTI DIESELING UNIT". This is an item 70 Chevelles do not have.
Another reason not to mix and match wiring harnesses.
P.S. Not sure ,, But I think a 70 A/C harness is a 5 wire and a 71 is a 6 wire, Not sure, I do not remember?
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
1970 SS LS-5/M-22 El Camino- Org. Owner-AACA 2016-Senior Grand National Winner---MCACN-GOLD-2013
1970 ( FRAUD) SS 468 Station Wagon - Driver.