1995 Chevy Blazer A/C willl blow out of defroster/floor but

RIGSBY92

MEMBER
1995 CHEVROLET BLAZER
4 CYL
4WD
AUTOMATIC
197,906 MILES

The air conditioning has worked great until a week ago when it just quit blowing out of the vents. The air is still ice cold but will only blow of the defrost and floor no matter what you set the switch at. I have took the switches out and messed with the vacuums but unpluging and pluging them one at a time to see if by doing that it might blow out of the vents and it will not do so. I figured it is something behind the dash such as a door flap or something like that but i'm not for sure. I was going to take the dash out but I want to see if there is something else I can do or check before going this route.

5 Replies

HMAC300

MECHANIC
48,601 POSTS

Hopefully you have put the lines back where they belong. There should be a vacuum motor on the heater module that isn't working correctly. YOu'll have to feel around by the module to find it and see if it is getting vacuum to work it. There may be two so you'll have to squeeze in there and check.

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Monday, June 28th, 2010 AT 5:53 PM

RIGSBY92

MEMBER
3 POSTS

Yes I took one vacuum off at a time and they all got put back in the correct place. Ok well where is the heater module located at? I'm not sure where it is ok what it looks like and does the dash have to come out for this?

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Wednesday, June 30th, 2010 AT 10:53 AM

HMAC300

MECHANIC
48,601 POSTS

Teh heater module is on the passenger side of the truck under the dash. You shouldn't have to pull the dash out to change the vacuum motor. It won't be easy to do but you can reach it and see if it's stuck or not working. It may move if you mess around with it. here is a diagram you can find the part from this......

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Wednesday, June 30th, 2010 AT 1:13 PM

RIGSBY92

MEMBER
3 POSTS

So the from looking at the diagram this module would be the heat/defrost actuator? I appreciate all your help. I was gonna pull the dash out and check all the vacuums before you helped me.

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Thursday, July 1st, 2010 AT 9:43 AM

HMAC300

MECHANIC
48,601 POSTS

Actually it should be the centr outlet acutator. If it comes out the floor then that one is ok. Keip in mind that the chart I sent you is only a generalization and not te actual thing. These actuators may be righ ton top of each other or a little bit apart.