Hey guys, new to the forum and new the C5, bought a 99 C5 about 2 weeks ago and its the best thing since sliced bread, Have a question though my AC / Heat only works on 4 and 5, 1-3 i dont get anything. Im pretty sure its a 5 channel Resistor, the only problem is I dont know where it is in this car and if you can pick it up a locally. Anyone done this before or had this problem? Any help would be great, thanks.

 

Never mind i fixed it, it was the blower motor resistor 25 dollar part at autozone, took about 30 minutes, its under the dash passenger side.

 

My blower is doing almost the same thing. I have a 2000 with the manual HVAC controls. Setting 1 and 2 do nothing. 3, 4, and 5 work normally. I'm glad I found your post explaining how you fixed the problem. But could this just be a matter of needing to clean the blower motor? Did you check for power at the fan before deciding that you needed a new resistor? Is your fan still working?

Thanks, Bruce

 

Yes my fan is still working, if its working on the other settings then its not your blower. I would be about 99% sure that its the resistor, actually the same day i fixed mine i called my buddy up who has a 200x GTP who had the same problem it was the same exact part! both resistors just by looking at them you could tell they were fried. So if you want to check the resistor before buying it just pull it out and most likely just by looking at it you can tell that its done.

From memory I think there are 3 screws holding it in, two facing outward and one against the firewall, the one against the firewall is a pain, just get a few turns on it and you should be able to get the old one out and the new one back in otherwise let just say only two screw would be holding mine in. Good luck.

 

Thanks - good info!

I wonder what caused the original resistors to fry? If the motor was a little sticky and required too much current to turn, I suppose they could have overheated? Or maybe it was just time... Maybe I'll pull the blower motor at the same time and give it a good cleaning.

Thanks again - I love this forum! -Bruce

 

Bruce

i recommend removing the fan motor and give the fan a good twist. If it spins free, your all set and theres a good chance the resistors just went bad. If it were me, i would just replace the bad resistors! I would also use a higher wattage resistor and never have to worry about it again.

If the fan motor is stiff, you can lubricate it. There are TWO versions of the fan used. An early version and a late version. I know the 2002 has the later version and the 98 has an early version. I do NOT know where GM converted the fan over to the newer style. If you have this one, it a late style and easy to lubricate.



The early style is sealed on the end and requires you to drill a small hole in the bearing cover to inject the oil.

Bill

 

Hey Bill - thanks for the advice. I didn't see your reply until just now... but the good news is that I replaced the whole resistor unit with one that I bought at autozone for 20 bucks, last night - everything is working very well! It's a bit difficult to get at the screws for the resistor unit - especially with the fan installed. So, to make things easier on myself, I pulled the fan motor, first. While It was out, I inspected it (it spun freely and had no obvious corrosion or dust build-up) and lubed it (I have the same fan that you show in your link, from the looks of it). I would normally have tried replacing the resistors, as well. However once I saw the part, I was glad that I hadn't decided to go that route. I will take some pictures of the old part and you'll understand what I mean - the new one looks much different and has conventional resistors. I might go the route that you suggest and just replace the resistors if this ever happens again.

For anyone that reads this - make sure that you have a 7/32" 1/4"-drive socket and some small extensions to loosen the screws on the resistor unit. Note that you don't need to completely remove the rear-most (closest to the firewall) screws as they simply fit into some grooves on the unit and it can be slid out once the screws have been loosened.

 

Pic of the failed blower motor resistor! The other side is similar. Interesting resistors, right? The autozone replacement looks quite a bit different, has normal looking resistors, and works perfectly.

 

yep thats what my blown one looked like too.

 

I have the automatic multispeed A/C. It uses a circuit board and costs a $$$$$$FORTUNE$$$$$$$$$$$.
Got one for about $75 at GM parts wholesaler.
Sometimes MANUAL is NICE. BIGHANK

 

My fan no longer works, last speed to work was # 5. Where is the blower motor resistor located? Thanks Rich

 

read above posts

 

Its up in the corner near the firewall on the passenger side INSIDE the car. To get my expensive part out I first removed the blower motor and got some ROOM. Then there are 2 or 3 screws holding in the module or resister. The one in the back was ALMOST impossible to get to. When replacing I left that screw in and slid my module over it (that side was slotted not just a round hole) and tightened screws as much as I could. HAVE FUN BIGHANK

 

I also found it easier to turn the screws that are closest to the firewall after removing the passenger footwell compartment cover. It gave me about another 1/2" of room and made things that much easier. Good luck!

 

Wow, just removed blower motor & resistor. All corvette forum threads are on the money. The resistor looks clean, but the motor looking inside the hole on the side shows all rust inside & on brushes & windings. I have a resistor on order becaused I ordered part before taking apart & just ordered a blower. Does the squirrel cage come with new motor or you re-use cage. How does it come apart from motor? Thanks Rich

 

If I were you, I'd put the new resistor in there, anyway. If yours is the same part number as mine (see picture), it was redesigned and replaced by another part number. I'm guessing that might have been to correct a design flaw - but like I said, I'm guessing.

Got a picture of the motor? I don't know about the "squirrel cage". I didn't remove mine. Someone here is sure to know.

 

Wait, so where is the resistor?

 

The resistor module (manual HVAC) and the HVAC Fan controller (duel Zone ) are located in this small recess on the passengers side of the Air Box in the area pictured:

Late model HVAC Fan and module well:



Early model fan and module in place:



BC

 

I've got my blower motor making one hell of a racket and need to pull it out. I'm figuring I'll need to replace it because the squirrel cage fan is probably broken. Probably caught a mouse in it or something...

Anyway, I want to order a replacement, but there are two models. One with manual a/c controls and the other with auto a/c controls. I'm guess my 2002 Z06 has auto a/c controls but figure I had better check first. Don't want to order the wrong one.

So anyone know for certain?

Thanks.

 

NOPE! There pretty bullet proof. Ive had mice, dog food, sticks and paper in mine and all ive done is clean it out. Killed the mouse once. He didnt like 1720 RPMs







Just clean it and you should be fine.

BC