[Cecil]

Hello again! New problem. Sometimes when I turn off the ignition, the low-speed fan (vent fan that's always on) keeps running. If I switch to a higher speed it will go off, but if I switch back to low it will come back on. After doing this a couple times, it will stay off. I should also note that sometimes I get no fan at all on any speed with the engine running.

Sounds like a bad switch to me. What do you think?

 

[John_Muha]

Maybe take a look at this. Yours is an A/C car. Right? If so, this might narrow things down by measuring the wires under the hood.
http://www.chevelles.com/cgi-bin/forum/ultimatebb.cgi?ubb=get_topic;f=27;t=000834

 

[Cecil]

Ok, so I'm still working on this, but it's worse than before. Everything stopped working. I'm trying to at least get the fan to be always on.

Here's what I see. At the firewall relay, there are two connectors. According to my assembly manual (and what I think I see) one has a single black wire (ground, connected to firewall and blower motor), the other has three ([1]large and small orange, always hot, [2]large purple to blower motor, [3]blue to fan switch in dash). I can apply + to the blue wire and make the relay close, I see + on the purple wire, but I don't get any blower action. This does not seem right to me.

Also, I'm trying to repair the switch. Here's a pic. Switch The piece on the right is the slider part that makes all the contacts happen. The connectors on the back of the piece on the left are numbered 1 - 6. Problem is I don't know which way it goes together. Can someone explain which way I put this back together? Or, even better, while you're at it tell me (all of us) which connectors have + in the various switch positions? That would be a good lesson to learn!

advTHANKSance

 

[John_Muha]

"the other has three ([1]large and small orange, always hot, [2]large purple to blower motor, [3]blue to fan switch in dash). I can apply + to the blue wire and make the relay close, I see + on the purple wire, but I don't get any blower action. This does not seem right to me."

What happens when you apply a known good 12 volt jumper wire directly to the purple? Does the fan run high speed?
Perhaps the relay contacts are shot. I'm sure you know that blue is the relay coil wire to close the relay.

 

[Cecil]

I get nothing now, although yesterday I did get the fan running for a while. Maybe the blower motor is giving up?

 

[John_Muha]

Or the fan has a poor ground. I'd check out the fan motor first. If you aren't getting it to run consistantly, with 12 volts directly to it, you may be chasing your tail checking out the other items. Almost sounds like it's worn out. Nothing left of the brushes. Might be able to get a new one over the counter. They aren't that expensive.
*EDIT*
Dick has them for $35.00 but I doubt he's open today. They are fairly universal so you might be able to find one elsewhere.
http://www.true-connections.com/cat/page48.htm

 

[Cecil]

Bummer, 'cause that motor is tough to get at...

 

[troy-curt]

Make sure the blower motor is grounded good. Then run a jumper (12 volt) to the blower motor. Most parts stors have motors.

After reading the post again, sounds like the switch is bad. HTH.

Good Luck.

Troy,

 

[Cecil]

Got the blower motor out. If I hold it horizontal (like when it's attached to the firewall) it doesn't work, but if I turn it vertical it does. Too bad...

 

[Cecil]

Heater blower motor, no fan, Worldwide Auto Parts, $23.00

Such a deal!