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post #1 of 11 (permalink) Old 07-31-2007, 11:45 PM Thread Starter
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1999 Intrepid ES fans only works on high

The heater AC fan in my 1999 Intrepid ES only works on the high setting.
The in dash fan speed controller appears to be fine.
How do I fix this?
Thanks.
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post #2 of 11 (permalink) Old 08-01-2007, 01:24 AM
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assuming that you have Automatic Temperature Control (ATC) I'm betting the blower control module is bad... and as far as location its located underneath the dash on the passenger side, below the glovebox, at the very back held on by two screws. You'll know it when you see it, its connected by a connector which consists of a green wire and a black wire... just disconnect.. unscrew the screws, pull out module (looks like a grey flattened honey comb) and just pop the new one in, put two screws in, plug in to module, turn car on and enjoy...

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post #3 of 11 (permalink) Old 08-01-2007, 02:16 AM
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The ATC ones don't seem to go out as often, but this is a classic symptom of a blower motor resistor on MTC. Even if you do have ATC, I would do what Dru suggested and check the blower control module(ATC version of resistor block).
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post #4 of 11 (permalink) Old 08-01-2007, 02:21 AM
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Might be an ES with MTC or mistakenly called an ES instead of an SE.
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post #5 of 11 (permalink) Old 08-01-2007, 03:45 AM
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Quote:
Originally Posted by Ronbo
Might be an ES with MTC or mistakenly called an ES instead of an SE.
Yeah, I went to look at a 2000 "ES" the other day. When I talked to the guy he said it was a 2.7, but that still would have been possible. When I saw there were no foglights or alloys, I knew I had just wasted a nice chunk of my day off driving to look at a car that I never would have if the owner wasn't dyslexic.
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post #6 of 11 (permalink) Old 08-01-2007, 02:00 PM Thread Starter
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Quote:
Originally Posted by 00RT
The ATC ones don't seem to go out as often, but this is a classic symptom of a blower motor resistor on MTC. Even if you do have ATC, I would do what Dru suggested and check the blower control module(ATC version of resistor block).
Thanks for the replys. I have the manual temp control. Having read the Haynes manual some more I am pretty sure that it is the blower motor resistor block which is bad.
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post #7 of 11 (permalink) Old 08-01-2007, 02:44 PM
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Done it, takes forever to do, but very simple also....
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post #8 of 11 (permalink) Old 08-01-2007, 03:48 PM
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exact same instructions as I said before except instead of blower module its blower resistor...
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post #9 of 11 (permalink) Old 08-02-2007, 12:58 PM
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Chances are the new one will do the same thing in a short period of time. Usually when that happens you have to replace the blower motor too. The old motor draws too much current I believe and toasts the resistor.
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post #10 of 11 (permalink) Old 12-09-2007, 09:09 AM
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Hi, first time user here. I have a 94 Intrepid ES with the same situation. Blower motor stuck on high. I replaced the ATC unit but that didn't fix it, so I'm assuming its the Blower Control Module. No scrap yards in town have it, and its $225 at the dealer. It's simply a circuit board with what looks like 2 big transistors and some capacitors coated in epoxy. I would rather try and diagnose the circuit board and replace a $2 part then spend $225......or wire a on/off switch to the blower motor and it'll just be on high when I want it, and off when I dont need it.
Does anyone have a schematic for the blower control module ?
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post #11 of 11 (permalink) Old 12-09-2007, 06:15 PM
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Quote:
Originally Posted by jlove70 View Post
Chances are the new one will do the same thing in a short period of time. Usually when that happens you have to replace the blower motor too. The old motor draws too much current I believe and toasts the resistor.
Unfortunately this is all too often the case. I have ATC and my blower power module died....I fixed it by replacing the big transistor and it was dead 3 days later. At least this transistor failed shorted so I have heat..... :p

Occasionally I can hear the bearings squeal on the thing..... it's being replaced after finals.
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