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07-22-2005, 06:13 PM
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#1 |
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Enormous Member
Join Date: May 2005
Location: CLOUD "9"
Posts: 108
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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 ? 
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"79" Chevy Stepside 350/350 Check my Blog @ www.BaldMikesWorld.blogspot.com |
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07-22-2005, 07:08 PM
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#2 |
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Magnificent bastard
Join Date: Oct 2004
Location: Glendale, AZ
Posts: 196
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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.
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1977 Big Block Burb |
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07-22-2005, 07:21 PM
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#3 | |
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Enormous Member
Join Date: May 2005
Location: CLOUD "9"
Posts: 108
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Quote:
Anyone else ?
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"79" Chevy Stepside 350/350 Check my Blog @ www.BaldMikesWorld.blogspot.com |
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07-22-2005, 07:55 PM
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#4 |
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Registered User
Join Date: Apr 2003
Location: Central florida
Posts: 3,223
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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?
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07-22-2005, 09:06 PM
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#5 | |
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Enormous Member
Join Date: May 2005
Location: CLOUD "9"
Posts: 108
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Quote:
Think maybe the blower motor could be shorting this thing ?
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"79" Chevy Stepside 350/350 Check my Blog @ www.BaldMikesWorld.blogspot.com |
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07-22-2005, 09:42 PM
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#6 |
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Registered User
Join Date: Apr 2003
Location: Central florida
Posts: 3,223
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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 |
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07-23-2005, 12:25 AM
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#7 |
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Enormous Member
Join Date: May 2005
Location: CLOUD "9"
Posts: 108
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full foot notch
Thanks Bro I will check it out and ost back.......
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"79" Chevy Stepside 350/350 Check my Blog @ www.BaldMikesWorld.blogspot.com |
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07-23-2005, 03:57 AM
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#8 |
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Stepsides RULE
Join Date: Jul 2004
Location: Pineville, LA
Posts: 1,921
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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 
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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 |
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07-23-2005, 01:54 PM
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#9 |
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Enormous Member
Join Date: May 2005
Location: CLOUD "9"
Posts: 108
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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 |
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07-23-2005, 04:06 PM
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#10 | |
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Stepsides RULE
Join Date: Jul 2004
Location: Pineville, LA
Posts: 1,921
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Quote:
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
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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 Last edited by cliffsta; 07-23-2005 at 04:07 PM. |
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07-23-2005, 04:41 PM
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#11 |
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Enormous Member
Join Date: May 2005
Location: CLOUD "9"
Posts: 108
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Fair enough, lol.................
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"79" Chevy Stepside 350/350 Check my Blog @ www.BaldMikesWorld.blogspot.com |
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07-24-2005, 02:26 PM
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#12 |
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Registered User
Join Date: Apr 2003
Location: Central florida
Posts: 3,223
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so you figure it out yet baldmike
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07-24-2005, 03:39 PM
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#13 |
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Enormous Member
Join Date: May 2005
Location: CLOUD "9"
Posts: 108
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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..........
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"79" Chevy Stepside 350/350 Check my Blog @ www.BaldMikesWorld.blogspot.com |
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07-25-2005, 10:08 AM
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#14 |
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Registered User
Join Date: Apr 2005
Location: Tulsa Oklahoma
Posts: 943
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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
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square body trucks an addiction or an investment either way they consume all my extra time and money |
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07-26-2005, 11:35 AM
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#15 |
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Registered User
Join Date: Jan 2004
Location: Garland TX Dallas area
Posts: 658
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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.
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1998 Pontiac Grad Prix GTP 1969 C10 396 TH400 3.08 posi |
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07-26-2005, 01:40 PM
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#16 |
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Enormous Member
Join Date: May 2005
Location: CLOUD "9"
Posts: 108
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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 |
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07-26-2005, 06:51 PM
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#17 |
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Project92 SWB stepside
Join Date: Feb 2003
Location: Louisville KY
Posts: 4,792
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There is a relay outside under the hood where the blower bolts up. Change the relay and you should be set.
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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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07-27-2005, 06:14 PM
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#18 | |
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Enormous Member
Join Date: May 2005
Location: CLOUD "9"
Posts: 108
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Quote:
I already replaced the H/S fan relay.......
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"79" Chevy Stepside 350/350 Check my Blog @ www.BaldMikesWorld.blogspot.com |
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