Sorry about that. Below is manual ac.

Answered by JDL (expert)
14,401 answers provided

Splitting the diagram is the only way I could do it and make it readable. The top diagram was for automatic ac. Whichever you have.

Answered by JDL (expert)
14,401 answers provided

Could you give me a bit more of the diagram?
Another problem it has is no fan on Hi, just the lower speeds...
Where does the Hi (#5) lead connect ?
There must be a voltage divider there somewhere but I have no color code for the leads and am not sure where it is located...
If this is a really big file, could you send it to my email easier?
I can zoom and crop to suit on my own...

Response from kurt_s_37
2 questions asked

Sorry, I can't do any better on the diagrams. Some of the large libraries carry automotive databases, if you live in the area they serve, the info is free. One of their databases, you access on your home computer. The other database is mitchel and you have to go to the library to access. It's all free, if you live in an area they serve. You can pay a small yearly fee to access alldata or mitchel for a single vehicle.

Below is wiring for blower speeds, manual ac. When the relay is energized, that little arm with the arrowhead, switches to terminal 87, carries voltage to blower motor for high speed only. When relay is not energized, the arm is on 87a, has continuity for lower speeds, only.

Answered by JDL (expert)
14,401 answers provided

Thanks much...
Would never have found the direct link to the relay...
This explains why the lower speeds work while the Hi does not...

Should be able to solve all the problems w/ Ms Tahoe this week end...
If I can catch the daughter in law during one of her pit stops, that is...

Response from kurt_s_37
2 questions asked

If you can only work on it intermittently, hard to track it down. Good luck.

Answered by JDL (expert)
14,401 answers provided