Question about 2004 Ford Crown Victoria

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I cannot control the fan speed manually even when the climate control is not set on automatic. Many time while idling, the fan speed is reduced and controllable, but when on the road the fan speed is faster and cannot be reduced. I can make the fan go faster, but when I try to reduce the speed it just reduces it to the speed it was before adjusting it higher. I doesn't seem to make any difference if the temp control is set at 70 or 76 degrees plus.

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  • wbreshears Jul 30, 2009

    The answer sounds logical, but I will not be able to judge the outcome until I follow through with the suggested solution.

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You have a vacuum leak of some sort in the vent system, what happens is that high speed there is a little flap that controls how much air to let in, based on a vacuum system. If there is a leak anywhere in the system the flap will not be pressurized and will allow all different amounts of air into the vent system. Usually being a ton of air at high speeds, and you can't control it. This is fairly common and is an easy / inexpensive fix in most cases. A lot of the times it's just a seal that has come loose, or a clamp that's become unclamped. However it is definitely best for a mechanic to diagnose as it can be very difficult to pinpoint. Sometimes it is just a small hole in the tubing somewhere, they have systems to detect this.

This definitely sounds like what is going on with your car, if you are extremely mechanically inclined you can try to find it / replace the hoses but I personally recommend having someone do it for you and it will probably end up being very inexpensive.

Thanks
Tim

Posted on Jul 30, 2009

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Heater fan runs when heater is off.06 ford expoler


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