1994 Chevrolet Cavalier front windshield defroster

1994 CHEVROLET CAVALIER

78,000 MILES • 4 CYL • FWD • AUTOMATIC

MKAONE

MEMBER
2 POSTS

Hi, when I turn on the defroster the air does not come out of the top vents at the windshield. It does not matter which speed I selected. So for example when I have it on high just a little bit of air comes out with no force. I have taken the faceplate off and checked all the controls and there is a little part. Not sure what it's called but my cousin said it was working. Any suggestions and help will be greatly appreciated.
Thank you

Feb 1, 2015 at 6:39 AM

JACOBANDNICKOLAS

✓Experienced Mechanic
110,248 POSTS

I believe the air flow vents are operated by engine vacuum. Have you checked for leaks?

Feb 1, 2015 at 9:24 PM

MKAONE

MEMBER
2 POSTS

Hi, thanks for replying. No I have not checked for leaks. I do not know where to check. Can you provide how and where I can check for the leaks?
Thank you,
Mark

Feb 2, 2015 at 1:06 AM

JACOBANDNICKOLAS

✓Experienced Mechanic
110,248 POSTS

The vacuum is provided by the engine so you need to start by locating the vacuum supply from the engine, through the firewall, and under the dash. Also, if you look at the attached picture, you will see a mode actuator and defrost actuator. Locate them under the dash and check for vacuum to them.

Image (Click to enlarge)

Feb 2, 2015 at 10:50 AM

JACOBANDNICKOLAS

✓Experienced Mechanic
110,248 POSTS

FYI numbers 29 and 30 on the pic is what you are looking for,

Feb 2, 2015 at 10:51 AM

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1994 Chevrolet Cavalier front windshield defroster

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