Best way to clean up critter debris in HVAC? - Chevy Impala SS Forum
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post #1 of 20 (permalink) Old 05-24-2018, 10:00 AM Thread Starter
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Question Best way to clean up critter debris in HVAC?

Over the winter it appears that rodents must have gotten into the engine compartment and got leaves or other crap into the HVAC box. My son was driving the car and all of sudden the passenger compartment filled with smoke, which I'm guessing was from crap that was in/around the heater core. While that eventually subsided, I have this not so nice smell now coming from the vents, and the blower motor only works on HIGH. I need to check my fuse panel and see if any are blown, I am hoping I don't need a new blower motor. I read the blower motor R/R thread, and saw the removal steps, and was wondering if there were any old threads where someone had to clear vents, intakes, etc of debris?

Am I going to need a plumber's snake or coat hangar to get into hard to reach places to loosen up stuff to suck up with a shop vac?
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post #2 of 20 (permalink) Old 05-24-2018, 10:27 AM
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Quote:
the blower motor only works on HIGH.

You will have to check out your blower resistors. When they fail you lose all but HIGH.


They may have burned off the mount or the thermal fuse may have burnt out. The best choice is a NEW replacement.


Be sure you have the correct fuse to the blower and that it still works properly or the resistors may burn out again.


The images are from one that rusted out.
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post #3 of 20 (permalink) Old 05-24-2018, 11:04 AM Thread Starter
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Is this the best place to get new parts?

https://www.rockauto.com/en/catalog/...tor+relay,3088
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post #4 of 20 (permalink) Old 05-24-2018, 11:09 AM
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You need to drop the blower motor. It will be filled with crap. Don't run it at all until you do this. Once the motor is out, you shove a shop vac hose up there and get all the goodies. BTDT...
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Old cars, just like classic rock... 60s, 70s, 80s, and 90s!
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post #5 of 20 (permalink) Old 05-24-2018, 11:51 AM
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Quote:
Is this the best place to get new parts?

https://www.rockauto.com/en/catalog/...tor+relay,3088
Wrong Part


https://www.rockauto.com/en/catalog/...+resistor,6557


I got one from Rock Auto when I got other parts. I would think a local store would be cheaper if you just want the resistor.

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post #6 of 20 (permalink) Old 05-24-2018, 12:18 PM
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It's pretty easy. Remove the door sill, kick panel and the cover under the blower. There will be 3 screw holding the blower motor in place. You'll need a 1/4" drive handle and a 7mm socket. A ratchet and extension will work also. As mentioned earlier, vacuum out the hair, teeth and eyeballs of the critter that committed suicide. You'll see a plug that goes to the blower resistor. Remove the resistor and replace it with one from a local auto parts store. OReilly's part number is Part #: 20254 and it's around $25.00. The hardest part is that one of the screws that hold the blower in is back by the firewall. You can't really see it so "May the Force be with you. Trust the Force".

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post #7 of 20 (permalink) Old 05-24-2018, 12:24 PM Thread Starter
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Thumbs up

Thanks everyone, I'll source the part from local Oreilly's.
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post #8 of 20 (permalink) Old 05-24-2018, 05:16 PM
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Ace, you had mentioned about the odor coming from the vents. I used to get a small bottle of deodorizer from the HVAC shop in town. It's very small bottle and it has green lettering. I can't remember the name but they used it in systems when a skunk got in the AC. I used it in my patrol car for other odors. It worked real well. I'll try to see if I can find something on it. Till then you can look too. It was a little pricey for the amount but it was good stuff.

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93 9C1: Work & Cubic Ca$h This started with a new headlight and fender Celeritas In Conficiendo
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post #9 of 20 (permalink) Old 05-24-2018, 06:26 PM
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Quote:
Originally Posted by gbhs72 View Post
Ace, you had mentioned about the odor coming from the vents. I used to get a small bottle of deodorizer from the HVAC shop in town. It's very small bottle and it has green lettering. I can't remember the name but they used it in systems when a skunk got in the AC. I used it in my patrol car for other odors. It worked real well. I'll try to see if I can find something on it. Till then you can look too. It was a little pricey for the amount but it was good stuff.

Mark: Snowman-33
For smell you could mayhaps use spray Resolve for a ready and cheap solution. Not a whole lot to add except I always be real careful positioning the foam collar that seals the motor-cooling tube. It's usually 1/2 rotted anyway, but will allow quite a bit of airleak and diminished air velocity out the vents if not sealed as best as possible. At one point during my last cleaning (averages out to about bi-annual ) I ALMOST cut a new one from some of those electrical receptacle insulator pads. I said almost. But I'll definitely do that next time.

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post #10 of 20 (permalink) Old 05-25-2018, 07:24 AM
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The 91-93 car screws have 7mm heads, and the 94-96 cars have 5.5mm heads.

The new blowers have short squirrel cages, and flow less air. The OEM cages are black, and taller. You can not swap the squirrel cages between the two motors, because the newer ones are taller, and the OEM fan will not fit over them. To the best of my knowledge, the motor is not rebuildable.

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For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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