97 S10 Blazer 4x4 4.3 Idle jumps to 1200 rpm when AC is turned on. How can i fix this.

97 S10 Blazer 4x4 4.3 Idle jumps to 1200 rpm when AC is turned on. How can i fix this.

Check for a vacuum leak.

Checked for vacume leaks. Everything check ok no leaks. Is there a some type of switch to raise the rpms for the ac when it is turned on.

Still broken. Does anyone have a idea?

You might try cleaning TBI and IAC valve.

And get a engine capable scanner on it and check out and test actual idle and desires idle iac and rpm readings.

Thank You , MT-2500 I will plug in a scanner this weekend.

You are welcome and let us know what you find.
Good luck
MT