When I run the air conditioning or heat in my 1995 Oldsmobile Cutlass with electronic climate control, I get very little air out of any of the outlets. It doesn't matter whether I direct the air to the windshield defroster, dash vents or floor vents. If I increase the fan speed to its highest setting, I get a loud rumbling/vibrating from inside the dash.
Any ideas on what might be the problem here?
Could be all kinds of things, most notably a big wad of leaves stuck in the fan. I've seen the fan impeller come detached from the motor too. Pull the covers and look inside.
--scott
As Scott said, check to see that there is nothing blocking the air flow.
We have had a lot of problems with GM hvac systems, personally.
The computer has gone out of a lot of these cars. On one of them, the computer was changed several times, and the problem was later found to be a bad ground.
The ones that have the vacuum modulated control unit (the dual AC system) can also have a problem with that somewhat expensive unit. In one case, one of the divertor doors froze and the vacuum unit simply couldnt open it. A little penetrating oil, and it came back to life.
It could be a lot of things.
When that happens to me it's rats. I put screens over the air intakes on my cars.
I do have the dual controls for the passenger and driver in this car. I live in the midwest, the car is a convertible, and is garaged during the winter months. That and we have had a cool summer, so the car hasn't been used much since last year. So hopefully the problem is a simple as a stuck actuator.
Earlier this spring I was cleaning out the garage and came across three dead mice in a bucket, so maybe there is a critter carcas stuck inside the fan assembly.
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