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#1 |
Pesemistic Optimist
Join Date: Dec 2002
Location: Prineville, Oregon
Posts: 227
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Fan high speed
The high speed on my blower motor does not work in my truck. I have heard of the fan relay going bad or a bad ground. The ground looks good so is there any way to test the relay or do I just have to buy a new one? BTW the truck is 1/2 tore apart so I don't have any battery power but stuff sure is easy to work on.
![]() Thanks for all the help, without this board I'd be rich and have alot of free time. ![]() Dan. |
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#2 |
Registered User
Join Date: Apr 2003
Location: NB
Posts: 3,367
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you could bench test the relay and see if power comes out where it should!
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__________________
1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD |
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#3 |
Pesemistic Optimist
Join Date: Dec 2002
Location: Prineville, Oregon
Posts: 227
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And how would I go about doing that?
Dan. (electrically challenged) |
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#4 |
Registered User
Join Date: Apr 2003
Location: NB
Posts: 3,367
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I by-passed all the hoccus poccus !
Just find the wire which makes the fan go on high and hook up a toggle switch from the fuse box. A high is all you need! ![]()
__________________
1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD |
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#5 |
Wiseass secured himself a BAN
Join Date: Nov 2000
Location: MOON!!!
Posts: 2,282
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Mine never worked. I even took the relay apart and the switch. Checked all the grounds and still nothing. DO NOT hook it up direct like ^ he said. You will fry the fan motor in due time. You may want to check the coils on the passenger side. There should the a thick coil and a thin coil. The thick coil is for high speed and the thin coil is for low speed.
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#6 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,643
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Does your fan work on low and medium speed, just not on high? Mine did that once - it was just a bad fan speed control switch.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#7 |
"Ochre Ogre"
Join Date: Apr 2000
Location: Springfield, MN
Posts: 3,558
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first off, A/C or not? A/C has a relay, non-a/c doesn't. The coils that were mentioned are for low and medium speeds. When it is on high it bypasses the coils all together(they are called resisters I believe).
If non-a/c I would start by checking the ground strap at the blower motor. Then move to the switch on the speed lever. They are known for going bad, usually a loose rivit or bad contact inside. I usually take it apart and fix it but the parts are cheep so you can replace it too. If it is an A/C truck then everything above applys plus you have the relay on the side of the air plenum, under the glove box. It has a ground wire that could be off or making a bad contact and they tend to go bad too.
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Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087 |
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#8 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Running power directly to the motor will do it no harm at all. That is what a relay does.
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#9 |
Registered User
Join Date: Apr 2003
Location: NB
Posts: 3,367
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U bet 10 years trouble free on/off!
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__________________
1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD |
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#10 |
Registered User
Join Date: Dec 2003
Location: oregon city, or
Posts: 164
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a relay controlls a steady 12 volts. the resistors bring the voltage down accordingly, hence the low and medium speed.
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yeah, but how's it wheel? |
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