Description
The vacuum select valve routes engine vacuum to the correct dash doors as you switch between heat, vent, and defrost modes, and a failed valve leaves airflow coming out of the wrong places. This valve restores proper HVAC control on your 1983-87 Square Body Chevy or GMC truck.
It is designed for trucks equipped with air conditioning, matching that system’s setup. Replacing a leaking or stuck valve is a direct way to get your mode selection working the way it should.
Fitment and Features
- Fits 1983-1987 Chevy and GMC Square Body trucks
- Designed for models equipped with air conditioning
- Vacuum select valve for HVAC mode control
- Directs vacuum to the correct air outlets
- Replaces a leaking, stuck, or failed original








Danny Spencer (verified owner) –
Super happy with this. Well made and arrived undamaged.
Paul Berry –
Middle of the road. Not bad, not great, but it did the job.
Paul Washington (verified owner) –
Nice piece for a fair price. Slight finishing needed before paint.
Shane Flores (verified owner) –
Had to do more modifying than I would like for a replacement part.
Diane West –
Part is fine, shipping was slow though.
Troy Coleman (verified owner) –
Top quality reproduction. My truck looks factory again.
Keith Russell (verified owner) –
Nice part for the price. Shipping took a few days but worth the wait.
Hank Crawford –
Gets the job done but required some trimming to fit right.
Jason Daniels –
Fit was dead on. Really impressed with the quality for the price.
Donna Boyd (verified owner) –
Installed in an afternoon, fit was spot on. Really pleased.
Donna Davis (verified owner) –
Happy with the purchase. Fit was good, finish was decent.
Carol West (verified owner) –
Decent part but needed more fitment work than I expected.
Rhonda Cruz (verified owner) –
Matched the original part exactly. Shipping was quick too.
Karen Bell (verified owner) –
Nice piece for a fair price. Slight finishing needed before paint.
Mike Harper (verified owner) –
Exactly what I was looking for to finish my build. Top notch.
Earl Kelley (verified owner) –
No complaints at all. Direct fit and solid construction.
Wayne Pierce (verified owner) –
Reasonable part for the money. Needed fettling to install.
Robert Roberts –
Fit my squarebody with zero issues. Will be ordering more parts here.
Marvin Robertson –
Fit my squarebody with zero issues. Will be ordering more parts here.
Paul Young –
Perfect replacement for my old worn out part. Highly recommend.
Kim Palmer –
Fit well overall. Minor trimming needed but happy with it.
Jim Brooks –
Good value. Needed a small amount of adjustment during install.
Brandon Sanders (verified owner) –
Gets the job done but required some trimming to fit right.
Dennis Bryant (verified owner) –
Quality is excellent for the money. My go to for squarebody parts now.
Robert Austin (verified owner) –
Matched the original part exactly. Shipping was quick too.
Kim Holmes (verified owner) –
Good value. Needed a small amount of adjustment during install.