What Chevy Man can answer this ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BALDMIKE · 07-22-2005, 06:13 PM

Here's the deal:

When using the A/C, low and medium speeds worked fine, but when switched to "high speed" the blower motor just stoped blowing (didn't blow fuse)

* I thought it might be the high speed fan relay so I replaced that, now when I turn on the A/C, low and medium work as before but when I switch to "high" it pops the fuse "20amp". (didn't pop when using old H/S fan relay)

* I assumed the new high speed fan relay was bad and returned it for another new one only to find it doing the same thing.

* I unpluged the inline power condensor to the blower motor and it still poped the fuse when I turned A/C to "high".

* I unpluged the blower resistor and still poped the fuse when switched to "high".

I haven't tested the control panal in the dash yet, but was wondering if anyone had any other good ideas ?

Bad Karma · 07-22-2005, 07:08 PM

Check the fan switch in the dash, on mine the wires were melted and the switch was burnt.... But, I only had high speed and no others.

BALDMIKE · 07-22-2005, 07:21 PM

Quote:

Originally Posted by Bad Karma

Check the fan switch in the dash, on mine the wires were melted and the switch was burnt.... But, I only had high speed and no others.

I will check that Saturday, thanks Bro.

Anyone else ?

full foot notch · 07-22-2005, 07:55 PM

look at the blower motor fan, possible resistance either mechanical or electrical that is drawing too much of a current when you switch it to high and that since its a current overload, is blowing the fuse, is you truck a glass fuse or plastic blade fuse type?

BALDMIKE · 07-22-2005, 09:06 PM

Quote:

Originally Posted by full foot notch

look at the blower motor fan, possible resistance either mechanical or electrical that is drawing too much of a current when you switch it to high and that since its a current overload, is blowing the fuse, is you truck a glass fuse or plastic blade fuse type?

Fuse is a plastic plug in yellow 20amp.

Think maybe the blower motor could be shorting this thing ?

full foot notch · 07-22-2005, 09:42 PM

i would try unplugging the blower motor itself and put a DMM in place of the motor, so you can see if your getting voltage, and with the DMM in place, just see if your getting power there (most likely 12v at the high setting) and if it blows with the blower motor not connected its a short IMO, if it doesnt blow when the blower motor is disconnected, reconnect it and try, if it does then, its most likely the motor, at which point i would go buy another blower motor and plug the new one in and see if it does still pop

if ya do all that and it still blows, lemme know and ill look at teh schematic to see if it oculd be something else

BALDMIKE · 07-23-2005, 12:25 AM

full foot notch
Thanks Bro I will check it out and ost back.......

cliffsta · 07-23-2005, 03:57 AM

Yeah sounds like the switch... mine doesn't work on high but on the rare occasions i throw the switch back and forth really quick, sometimes it'll jump into high....

My dash bezel is just so brittle, so i don't take it off unless i gotta

BALDMIKE · 07-23-2005, 01:54 PM

cliffsta I will check the switch also.

BTW cliffsta why do you hate your life ?

cliffsta · 07-23-2005, 04:06 PM

Quote:

Originally Posted by BALDMIKE

BTW cliffsta why do you hate your life ?

LMAO I dunno. It was a joke.

Basically, kinda like, whenever life sucks, i just jump in my truck and go for a joy ride.

You could complete my avitar by making it:

I hate my life.... when i'm not in my truck

BALDMIKE · 07-23-2005, 04:41 PM

Fair enough, lol.................

full foot notch · 07-24-2005, 02:26 PM

so you figure it out yet baldmike

BALDMIKE · 07-24-2005, 03:39 PM

No not yet, I had to do a family thaing Saturday.

I hope to check out the fan switch and some other things Sunday or Monday.

All I know is it's too damn hot with no air, lol..........

86 GMG · 07-25-2005, 10:08 AM

you might check the wireing harness to the blower ,a/c, heater unit see if there is a wire that is opened and shorting it out

flip66 · 07-26-2005, 11:35 AM

Check the blower motor common problem when the motor is bad. I know the problem in GM G Body cars 90% of the time it was the blower motor.

BALDMIKE · 07-26-2005, 01:40 PM

Well I'm down to checking the blower motor itself,must be it ?
Will post back, and thanks to all.......

phantom dually · 07-26-2005, 06:51 PM

There is a relay outside under the hood where the blower bolts up. Change the relay and you should be set.

BALDMIKE · 07-27-2005, 06:14 PM

Quote:

Originally Posted by phantom dually

There is a relay outside under the hood where the blower bolts up. Change the relay and you should be set.

Are you talking about the high sped fan relay or the tube shaped relay ?

I already replaced the H/S fan relay.......

07-22-2005, 06:13 PM	#1
BALDMIKE Enormous Member Join Date: May 2005 Location: CLOUD "9" Posts: 108	What Chevy Man can answer this ? Here's the deal: When using the A/C, low and medium speeds worked fine, but when switched to "high speed" the blower motor just stoped blowing (didn't blow fuse) * I thought it might be the high speed fan relay so I replaced that, now when I turn on the A/C, low and medium work as before but when I switch to "high" it pops the fuse "20amp". (didn't pop when using old H/S fan relay) * I assumed the new high speed fan relay was bad and returned it for another new one only to find it doing the same thing. * I unpluged the inline power condensor to the blower motor and it still poped the fuse when I turned A/C to "high". * I unpluged the blower resistor and still poped the fuse when switched to "high". I haven't tested the control panal in the dash yet, but was wondering if anyone had any other good ideas ? __________________ "79" Chevy Stepside 350/350 Check my Blog @ www.BaldMikesWorld.blogspot.com

07-22-2005, 07:08 PM	#2
Bad Karma Magnificent bastard Join Date: Oct 2004 Location: Glendale, AZ Posts: 196	Check the fan switch in the dash, on mine the wires were melted and the switch was burnt.... But, I only had high speed and no others. __________________ 1977 Big Block Burb

07-23-2005, 12:25 AM	#7
BALDMIKE Enormous Member Join Date: May 2005 Location: CLOUD "9" Posts: 108	full foot notch Thanks Bro I will check it out and ost back....... __________________ "79" Chevy Stepside 350/350 Check my Blog @ www.BaldMikesWorld.blogspot.com

07-23-2005, 03:57 AM	#8
cliffsta Stepsides RULE Join Date: Jul 2004 Location: Pineville, LA Posts: 1,921	Yeah sounds like the switch... mine doesn't work on high but on the rare occasions i throw the switch back and forth really quick, sometimes it'll jump into high.... My dash bezel is just so brittle, so i don't take it off unless i gotta __________________ 1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord

07-23-2005, 01:54 PM	#9
BALDMIKE Enormous Member Join Date: May 2005 Location: CLOUD "9" Posts: 108	cliffsta I will check the switch also. BTW cliffsta why do you hate your life ? __________________ "79" Chevy Stepside 350/350 Check my Blog @ www.BaldMikesWorld.blogspot.com

07-22-2005, 07:55 PM	#4
full foot notch Registered User Join Date: Apr 2003 Location: Central florida Posts: 3,223	look at the blower motor fan, possible resistance either mechanical or electrical that is drawing too much of a current when you switch it to high and that since its a current overload, is blowing the fuse, is you truck a glass fuse or plastic blade fuse type?

07-22-2005, 09:42 PM	#6
full foot notch Registered User Join Date: Apr 2003 Location: Central florida Posts: 3,223	i would try unplugging the blower motor itself and put a DMM in place of the motor, so you can see if your getting voltage, and with the DMM in place, just see if your getting power there (most likely 12v at the high setting) and if it blows with the blower motor not connected its a short IMO, if it doesnt blow when the blower motor is disconnected, reconnect it and try, if it does then, its most likely the motor, at which point i would go buy another blower motor and plug the new one in and see if it does still pop if ya do all that and it still blows, lemme know and ill look at teh schematic to see if it oculd be something else

07-23-2005, 04:41 PM	#11
BALDMIKE Enormous Member Join Date: May 2005 Location: CLOUD "9" Posts: 108	Fair enough, lol................. __________________ "79" Chevy Stepside 350/350 Check my Blog @ www.BaldMikesWorld.blogspot.com

07-24-2005, 02:26 PM	#12
full foot notch Registered User Join Date: Apr 2003 Location: Central florida Posts: 3,223	so you figure it out yet baldmike

07-24-2005, 03:39 PM	#13
BALDMIKE Enormous Member Join Date: May 2005 Location: CLOUD "9" Posts: 108	No not yet, I had to do a family thaing Saturday. I hope to check out the fan switch and some other things Sunday or Monday. All I know is it's too damn hot with no air, lol.......... __________________ "79" Chevy Stepside 350/350 Check my Blog @ www.BaldMikesWorld.blogspot.com

07-25-2005, 10:08 AM	#14
86 GMG Registered User Join Date: Apr 2005 Location: Tulsa Oklahoma Posts: 943	you might check the wireing harness to the blower ,a/c, heater unit see if there is a wire that is opened and shorting it out __________________ square body trucks an addiction or an investment either way they consume all my extra time and money

07-26-2005, 11:35 AM	#15
flip66 Registered User Join Date: Jan 2004 Location: Garland TX Dallas area Posts: 658	Check the blower motor common problem when the motor is bad. I know the problem in GM G Body cars 90% of the time it was the blower motor. __________________ 1998 Pontiac Grad Prix GTP 1969 C10 396 TH400 3.08 posi

07-26-2005, 01:40 PM	#16
BALDMIKE Enormous Member Join Date: May 2005 Location: CLOUD "9" Posts: 108	Well I'm down to checking the blower motor itself,must be it ? Will post back, and thanks to all....... __________________ "79" Chevy Stepside 350/350 Check my Blog @ www.BaldMikesWorld.blogspot.com

07-26-2005, 06:51 PM	#17
phantom dually Project92 SWB stepside Join Date: Feb 2003 Location: Louisville KY Posts: 4,792	There is a relay outside under the hood where the blower bolts up. Change the relay and you should be set. __________________ 92 C1500 stepside 496 Stroker Competiton Engineering Ladder bars/QA1 coilovers. Dana 60 rear with 4.10 gear and posi. Bonspeed Palisade 20x12 in rear w/335/30/20 and 20x8.5 front w/245/40/20. 5/8 drop with Belltech springs/DJM spindles/drop shocks. WWS Progress thread http://67-72chevytrucks.com/vboard/s...d.php?t=140448

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