Thread: Another A/C Heat Problem

I have a 99 Grand Prix GTP with climate control. It had the problem where the water was dripping onto the passenger floor through the blower motor. The drain plug in the engine bay was clogged and when it rained it just dripped into the cab. And the rain diverter at the top of the hood, just under the windshield, was pouring the rain into the fan/blower. Anyways, I replaced that plastic piece so it no longer drips into the blower, and I unclogged the drain plug.

The blower worked at that point, but now it doesn't work. I looked all over forums, it doesn't blow at all, not on high, not on low, not at all. I checked the blower and there is current going in and coming out. I checked the resistor and it was junk so I replaced it. It did not fix the problem. I checked the head unit connection and it looks great (no fried wires). I checked how many volts were going to the blower and it was real low, like 1 volt when it requires 7. So I replaced the head unit, still did not fix the problem. I am stumped at this point.

Can anyone help me figure this out before I bring it to a mechanic? Kinda need heat for this below zero weather we are having in mass. This weekend it will be 50 so I'd like to have a last attempt.
Thanks

The cage spins. Is there anyway to test the blower? I thought the multimeter test i did was good. I can go to a junkyard and grab a new one

If you unplug the blower motor and put a test light in the harness does it light? Bright or dim with the blower on high? You said it has climate control so i would assume it has a blower control module and not an actual resistor?

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yes, it has a control module.. here is the link http://www.rockauto.com/catalog/more...219&cc=1357130

i do not have a test light yet, i will have to grab one this weekend. is it the harness that comes from the control module or the other one, that i test?

The one coming from the blower control module. Just unplug it from the blower motor and test it there. If the test light lights bright then you are looking at a bad blower. You can always hooke the blower up to the battery with jumper wires if you want to be sure. The blower control modules have three wires going in a power, a ground, and the signal that comes from the hvac module. The signal circuit is difficult to test and know what it should be, but between 1-6 is normal.

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I bought a test light and checked the blower control module, and it lit up. I am not sure if the light would be considered bright or dim, but it lit up. Does this confirm the blower is junk?

Is the blower motor the same in all grand prix's? Should I run to a junk yard or look online (ebay/rockauto)? The model on it says "52481316", is there an updated version?

If you connect the test light right to the battery that will show you what bright looks like (assuming your battery is not dead) but yes if the test light, lights at the blower connetor then you need a blower motor. Im not really sure what blowers are the same.

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