No high speed fan

No high speed fan

Postby smokamoto [OP] » August 23rd 2014, 4:50am

I admit I'm too busy to search this (and I just saw a post about no high speed fan-but didn't read it doh!) so here it is...new AC Delco blower resistor & connector pigtail harness, cleaned up one burnt connector on the fan speed switch, and now all fan speeds work except high. Symptom was intermittent operation of fan on all speeds...I know, go search...
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Previous Astros-'95 passenger, '90 passenger
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Re: No high speed fan

Postby Lumpy » August 23rd 2014, 5:44am

I really don't know the answer, esp since you've replaced the usual suspect parts. But the good part about those who suggest "Go look it up" is that it's already looked up and there should be about five "related topics" at the bottom of this very thread.

I know it's a common problem. One that I haven't experienced though. So several people have already figured it out.


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Re: No high speed fan

Postby smokamoto [OP] » August 23rd 2014, 6:58am

Thanks Lump...I'm searching now!
smokamoto
1998 Astro 2WD 8 passenger
120k miles
Previous Astros-'95 passenger, '90 passenger
Original Poster [OP]
smokamoto
Fueling (1/4 tank)
Fueling (1/4 tank)
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Re: No high speed fan

Postby smokamoto [OP] » August 23rd 2014, 11:41pm

I checked the wiring diagram then found I have 12 volts to the blower resistor for the lower speeds but 0 volts to the orange wire that energizes the hi speed circuit. So I suspect the burned connection at the fan switch that I cleaned up has more issues, I'll do more troubleshooting on the switch. Gotta be it...
smokamoto
1998 Astro 2WD 8 passenger
120k miles
Previous Astros-'95 passenger, '90 passenger
Original Poster [OP]
smokamoto
Fueling (1/4 tank)
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Re: No high speed fan

Postby Lumpy » August 24th 2014, 12:26am

smokamoto wrote:I checked the wiring diagram then found I have 12 volts to the blower resistor for the lower speeds but 0 volts to the orange wire that energizes the hi speed circuit...



Orange, in OEM wiring, is HOT ALWAYS. If you're not getting voltage there then it might be as simple as the fuse that supplies that wire. I think(?) 30A in your year, marked HVAC.


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Re: No high speed fan

Postby smokamoto [OP] » August 24th 2014, 6:44am

Fuse ok, and the blower wouldn't work on any speed if blown, correct?
smokamoto
1998 Astro 2WD 8 passenger
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Previous Astros-'95 passenger, '90 passenger
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Re: No high speed fan

Postby chevy57bert » August 24th 2014, 7:54am

Only high speed.. resistor fail
Only lower speeds.. blown fuse
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Re: No high speed fan

Postby Lumpy » August 24th 2014, 1:41pm

I'm tracing the schematic in my 89 FSM. Mine appears to be wired differently than your year model. I don't have an orange wire on my resistor block.

But I think(?) what Bert suggests is universally correct across models.

+12v travels direct to the fan motor when in HIGH.

+12v travels to the resistor block and then to the fan when the selector is in any position other than HIGH.

The changeover occurrs at the HIGH blower relay on the firewall. With the fan switch in "Other than HIGH" the relay is not engaged and sends +12v to the resistor block. With the fan switch on HIGH, relay engages, sends +12v direct to the fan via the PURPLE wire.

SO - Might just be that your high blower relay is not functioning. Perhaps the relay itself, perhaps the connection or wiring to the relay. My relay went bad once.

Image

Test the relay with +12v on [52], GROUND or -12v on [152]

Image


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Re: No high speed fan

Postby smokamoto [OP] » August 25th 2014, 6:13am

Lump is THE MAN...blown 30 amp giant fuse under the hood...DOH check the easy stuff first!!!
Thank you Lumpy!
smokamoto
1998 Astro 2WD 8 passenger
120k miles
Previous Astros-'95 passenger, '90 passenger
Original Poster [OP]
smokamoto
Fueling (1/4 tank)
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Re: No high speed fan

Postby Lumpy » August 25th 2014, 6:41am

Lumpy wrote:
...The changeover occurrs ...



Occurrrs, Ocurrs, Ocuurss...happens


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