Question about 1999 Ford Expedition

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1999 ford expedition; intermittent- blower remains on after ignition is turned off. with ignition off, if i then turn temperature control to off blower shuts off and will not come back on. Also, intermittently, while driving a beeping alert tone near headlight switch although there are no illuminated lights on dash

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  • kaplan40 Dec 11, 2009

    q. one would think that with the ignition off, there should be no power to the climate control circuitry?

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  • Master
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That light may be related to the issue you have. locate the blower motor relay it's under the dash. replace that. there is one other issue that may be causing it. there is a resister block mounted on the duct work for the heat/ac near the fan. it's held in with a couple screws and there is a wiring plug attached to it. I would replace the relay first as this will likely solve the problem. if it does not the resister block has failed.

Posted on Dec 11, 2009

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  • Ford Master
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The problem u are having with the blower staying on is the blower motor speed control resistor is defective/shorted, as far as the beeping goes unless u see a light flash on that indicates a system problem it could be anything from a defective Body control module to a door ajar switch, the the module function can be actively tested with a special scanner by the Ford dealer, this might Trace the problem down with the beep noise. here is how u replace the blower motor speed control resistor. The resistor is located right next to the blower motor behind the passenger side glove box and is held into the air ducting by two 8mm headed screws, to access the resistor u must remove the glove box insert/compartment and drop the glove box door down, very easy, the whole job is a 3 on a scale of 1-10 with 10 being the most difficult, here also is a part number and a picture of the part for easier ID, the part is rectangular and is about 3/4"X 2"

MOTORCRAFT Part # YH1699 {#4L3Z19A706AA}
w/4 Pin Connector Price: $17.17 {source rockauto.com}

Posted on Dec 11, 2009

  • yadayada
    yadayada Dec 11, 2009

    Blower motor resistor

  • yadayada
    yadayada Dec 11, 2009

    well u are wrong about the power to the cluimate control there is power there with the key off.

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I will try to answer and offer you a couple of choices based on 2 different potential problems.

The blower motor resistor is the control for both the heater fan blower and the A/C since they are the same blower motor. It is the boost that you need to feel either heat or A/C through the vents. The part can be traced from the heater blower wires under the hood to a control about the middle of the Firewall. 2 bolts hold it in place with 1 connector wire. But a heater line will likely block access to switching the part. It is often a part that tapping will start it working again.

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SECTION 412-02: Heating and Ventilation 2000 Expedition/Navigator Workshop Manual
DESCRIPTION AND OPERATION Heating/Defrosting The heating and defrosting system has the following features:
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A/Ccontrols


I recently had the modulator replaced in my 2006 Expedition Limited. $210 CDN.

It was doing exactly the same thing. Apparently the part is only $70 CDN but the rest of the bill is labour. It was done by a reputable mechanic too, so I think that bill should be close to the best price out there.

Good luck, Ian

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