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Electrical & Wiring Troubleshooting electrical problems.

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  #1  
Old May 17th, 06, 11:32 PM
BUDS1970 BUDS1970 is offline
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Default 1970 Fan blower switch

I've got a '70 Chevelle project car and when I bought it the fan did not work at all.I'm just about finished and going thru everything for inspection so I'm trying to get the fan to run.By process of elimination,I've run a hot wire to the fan and it works.I've got juice up to the fan switch.If I jump a wire to the other side of the plug in at the fan switch it will run on high only.This was a AC car so I know it has to have everything that it came with (resistors,relays,etc.which I don't have)for it to run on low and medium,but I would be perfectly happy to have high and off.My question is if I replace the switch,it should do this right?And where can I find a switch since Autozone,Napa,Advance,nobody has a listing for one.Thanks.
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Old May 18th, 06, 12:08 AM
JayJ JayJ is offline
 
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Default Re: 1970 Fan blower switch

Buds1970, please keep us posted on this situation. I am trying to convert my A/C to heat only using the factory A/C controls and "non-air" blower resistor. I picked up the resistor for 9 bucks from my local classic Chevy store/shop.

However, I have not found much information on the wiring now that I have the resistor.

I have heard I should be able to get rid of the entire A/C harness inside the engine compartment and have a single wire running to the blower from the resistor?switch?

Let us know!
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Old May 18th, 06, 10:00 PM
Dean Dean is offline
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Default Re: 1970 Fan blower switch

Have you tried True Connections?
http://www.true-connections.com/
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Last edited by Dean; Sep 19th, 06 at 11:05 AM.
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Old May 19th, 06, 2:04 AM
JayJ JayJ is offline
 
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Default Re: 1970 Fan blower switch

Dean,

Any info on how to wire an air conditioned vehicle blower speed switch to a non-air resistor then to the blower motor so I get more than one speed?
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Old May 19th, 06, 10:57 AM
Dean Dean is offline
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Default Re: 1970 Fan blower switch

I think you're going to need to put the original resister back into the air flow.
I'm sure there are other ways to make the motor operate a different speeds but probably more trouble than it's worth.
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Old May 19th, 06, 4:09 PM
jat70 jat70 is offline
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Default Re: 1970 Fan blower switch

I had no idea this was so complicated. I guess that explains why the 70 I just bought is missing the blower switch. It was an A/C car, but the compressor was taken out of it.

There's a switch on ebay. I considered buying it, but now I apparently have more to learn about the system first.

http://cgi.ebay.com/ebaymotors/ws/eB...RK%3AMEWA%3AIT

Jay
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Old May 19th, 06, 5:19 PM
DG DG is offline
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Default Re: 1970 Fan blower switch

The switch is working if you get off, HIGH fan speed and nothing. The HIGH does not go thru the resistor pack. It connects the 12v right to the fan. You should be able to duplicate that. I know I can wiggle my switch and loose med and low speed. HIGH is alway there.

I got my switch from GM a couple years ago. I think the NOS parts are goen. Repops are available.

A used switch would be ok.
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Old May 19th, 06, 9:29 PM
stroobydoo stroobydoo is offline
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Default Re: 1970 Fan blower switch

Quote:
Originally Posted by BUDS1970
I've got a '70 Chevelle project car and when I bought it the fan did not work at all.I'm just about finished and going thru everything for inspection so I'm trying to get the fan to run.By process of elimination,I've run a hot wire to the fan and it works.I've got juice up to the fan switch.If I jump a wire to the other side of the plug in at the fan switch it will run on high only.This was a AC car so I know it has to have everything that it came with (resistors,relays,etc.which I don't have)for it to run on low and medium,but I would be perfectly happy to have high and off.My question is if I replace the switch,it should do this right?And where can I find a switch since Autozone,Napa,Advance,nobody has a listing for one.Thanks.
For high speed, the switch operates a relay under the hood on the firewall that connects a 12V power supply to the blower motor.
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  #9  
Old May 19th, 06, 9:48 PM
Dean Dean is offline
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Default Re: 1970 Fan blower switch

It obviously works if jumpering/bypassing the bad switch make the motor run on high speed.

Quote:
Originally Posted by BUDS1970
If I jump a wire to the other side of the plug in at the fan switch it will run on high only.
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  #10  
Old May 21st, 06, 6:56 PM
BUDS1970 BUDS1970 is offline
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Default Re: 1970 Fan blower switch

I wired a toggle switch in between the brown hot wire and the orange wire going to the fan.I'm perfectly happy with off and high.I even mounted it in the same location as the original switch so it looks somewhat authentic.
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