Question about 1997 Chevrolet Blazer

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None of my vents open but I can hear the fan working. what seems to be the problem? I can't get to the valves that work by vac.

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Your problem is probably caused by a vacuum hose (under the hood) which has cracked or fallen off or, as I once found on a new GM rental car, the vacuum reserve canister was (is) defective.
The reserve canisters can have any shape but from the volume, it will be between a pint and a quart capacity and have one or two hoses attached to it that come from the area of the intake manifold.

Posted on Sep 23, 2009

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The chances of all of the vacuum solenoids failing are next to none. Ensure that you have not broken the vacuum line somewhere down the line. This would allow all vacuum to escape and would cause the problem that you posted.

Posted on Sep 23, 2009


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I have a '96 Eddie Bauer Limited and it has the same problem. They told me that there is a small butterfly valvu located in the vac lines to select between hot or cold air. There is a tension spring connected to the valve, to an acutator, and to your ac contorl system. The spring on mine broke, so the valve opens and closes due to suction only. It is supposed to be about a $700.00 fix (due to the valves location by the firewall) but I have found a way around that. Try to aggressively apply the brakes making the vehicle slow rapidly, and at the same time turning on the blower fans with full bast heat selected. If this does not work, try doing the previous while going around a right hand corner. The corner will help the momentum of the valve turn in the right direction. Remember you have to switch the fan on full blast when you try either. If it works you should hear a thud as the valve flips shut and the heat should start coming out of the vents.

Good luck

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