What would cause no defrost when heater works Fine

Vicki Sulfaro

Asked by Oct 14, 2015 at 10:14 PM about the 1995 Chevrolet Beretta Coupe

Question type: Maintenance & Repair

The heater  works but no defrost

9 Answers


Vacume module under dash at blower vent assembly,check for vacume leaks,if none are found,may be switch module in control panel is bad.

1 out of 1 people think this is helpful.


Vicki Sulfaro

Ty so much we will check that, is there more than one?

1 out of 1 people think this is helpful.

I put that link in a seperate window ti make it easy to hyperlink, TST is spot-on but there are several diagrams there to show you what is happening , example (click for full screen)

Vicki Sulfaro

Hubby tore it apart and says there is more than one do you know where I can find a diagram that shows that part?

Vicki Sulfaro

We found the one vacuum line located behind the glove box it wasn't that, he says there is more than one according to chiltons

Vicki Sulfaro

Same diagram but can't get behind the module to see ty for helping

Vicki Sulfaro

Ok is this on drivers side?

Vicki Sulfaro

He thinks he figured it out ty sooooo very very much, really appreciate the help :)

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