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Joined: Mar 2005
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Hey peeps, I seem to have a problem that I cant seem to find the answer to. I was going down the road with the A/C on High and the fuse blew out. The damn thing only worked on high since ive owned it. Anyways, I replaced the fuse and it popped as soon as it touched. Now the fuse that was in there was burnt to a crisp, so I dont know what to do now. Please help me!!!!
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Joined: Oct 2000
Posts: 463
CEG\'er
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CEG\'er
Joined: Oct 2000
Posts: 463 |
You obviously have a short in the blower circuit or a bad motor. I would suggest that since the blower is a high current item that you have someone with electrical or electronics ability fix it. You don�t want to start a fire under the dash.
The blower resistor and associated wiring are weak spots on the Tour.
jeff
have you fixed your ford lately?
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Joined: Jul 2001
Posts: 7,100
Addicted CEG\'er
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Addicted CEG\'er
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The blower motor resistor is burnt out, and is likely causing excess current draw. (blower only works on high, as you said)
Resistor is a weak spot, as mentioned, but easily replaced, actually. Plug and play module, purchased from Ford, behind the radio panel, up under the dash (accessible from the passenger floorboard..)
Ray
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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Joined: Oct 2000
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Veteran CEG\'er
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The 30 amp fuse will also start to melt its holder in the panel too. I had to put an external fuse holder and a jumper to keep mine going. Fan is on HIGH a lot around these parts. Also, when my cycle switch was acting up (I didn't know it until it completely broke) I ran the fan on high a lot to cool down the car.  It's frickin hot and humid here!
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Joined: Oct 2000
Posts: 463
CEG\'er
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CEG\'er
Joined: Oct 2000
Posts: 463 |
A burnt out blower resistor would cause you to loose some or all of the fan speeds but it won�t blow the fuse (it would actually use less current because of higher resistance). The blower switch and associated wiring needs to be checked for shorts and potential shorts. Also, don�t overlook a bad fan motor.
You really should have it tested by a qualified tech to be safe.
jeff
have you fixed your ford lately?
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Joined: Aug 2004
Posts: 2,033
Hard-core CEG\'er
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Hard-core CEG\'er
Joined: Aug 2004
Posts: 2,033 |
Originally posted by mercman:
A burnt out blower resistor would cause you to loose some or all of the fan speeds but it won�t blow the fuse (it would actually use less current because of higher resistance). The blower switch and associated wiring needs to be checked for shorts and potential shorts. Also, don�t overlook a bad fan motor.
You really should have it tested by a qualified tech to be safe.
jeff
How much u wanna bet a bad resistor won't blow fuses? Happened to me...kept on blowin, turned out to be the resistor doin it afterall. The reason it might work on high only is becuz is uses NO resistance on high...there for, no need for a resistor.
Failure is simply the opportunity to begin again, this time more intelligently.
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Joined: Jul 2001
Posts: 7,100
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Addicted CEG\'er
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Originally posted by mercman:
A burnt out blower resistor would cause you to loose some or all of the fan speeds but it won�t blow the fuse (it would actually use less current because of higher resistance). The blower switch and associated wiring needs to be checked for shorts and potential shorts. Also, don�t overlook a bad fan motor.
You really should have it tested by a qualified tech to be safe.
jeff
WHOA.. how is there HIGHER resistance with a blown resistor... look at the schematic. the circuit then only has one path: through the high blower speed selection.
Ray
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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Joined: Apr 2003
Posts: 1,322
Hard-core CEG\'er
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Hard-core CEG\'er
Joined: Apr 2003
Posts: 1,322 |
Blown resistor? Does this mean "open" my understanding is that this is the only way a resistor will totally fail, they could lose tolerance but they will not short circuit. I have not seen the schematic but if the resistor did open it would read infinate (high) resistance with a multimeter. It would also read a higher than normal voltage drop.
1999 Toreador Red SVT, DOB 4/22/99, 2005 Of 2760.
"Many posted questions are answered by farm boys"
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Joined: Jul 2001
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I wasn't referring to the RESISTOR not having more resistance (obviously an open has more resistance than a short.)
I meant more total resistance in the circuit. The schematic would reveal that when in high-speed mode, the circuit does not include the blower resistor. Any other speed setting includes the resistor in the circuit.
If you have a shorted resistor (yes, it happens, though RARELY occurs...) and the only path is through said resistor, then the circuit would not be designed to handle that much voltage at the blower itself (some was normally "absorbed" or dropped across the now-bad resistor. This extra voltage at the blower may exceed the blowers ratings, and would blow the fuse.
Ray
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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Joined: Apr 2003
Posts: 1,322
Hard-core CEG\'er
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Hard-core CEG\'er
Joined: Apr 2003
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Understood, but I have never heard of a resistor shorting, ever.
1999 Toreador Red SVT, DOB 4/22/99, 2005 Of 2760.
"Many posted questions are answered by farm boys"
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