heater blower motor question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68c10owner · 01-03-2004, 02:53 AM

my heater doesn`t blow hard enough to keep the truck warm. does anyone know where i can get a new blower or any other tips/tricks to get this thing blowing better? oh yeah, it`s a 68 non a/c. thanks

Anthony

JOE BOB · 01-03-2004, 03:05 AM

Anthony, I have read on the baord here that certain year Cadillac's are a perfect fit, but are more powerful. Also, is there a different blower motor to order for an A/C truck? I would imagine they would be more powerful. Good Luck, Joe Bob.

Solver · 01-03-2004, 03:10 AM

either your high is out on your switch or my best bet is that your full of leaves and debris in the heater box. They plug up after a few years of leaves and such falling down the cowl.

scott67swbtx · 01-03-2004, 03:15 AM

I had the same problem with my heater about a month ago...mine was not blowing hot air ...ended up pulling heater assembly(inside engine compartment) found birds nest in there.....blows pretty hard now and a hole lot warmer

68c10owner · 01-03-2004, 04:35 AM

thanks for the info guys. whats the easiest way to get into the heater box and how do i test the switch? thanks again,

Anthony

GMC Jim · 01-03-2004, 07:23 AM

There is a considerable difference in A/C and non A/C blower motors....The Heater only blower motor specs are :- 6.25 amps max and 2550/2950 min/max RPM. The A/C blower motor:- 16.5 amps and 3700 RPM min. Most GM blower motors are interchangeable and can be gotten quite reasonably from most salvage yards.

da-burb · 01-03-2004, 11:42 AM

But is a used one worth the trouble when a new one is less than $20. I got a new one from NAPA last year. They no longer differentiate between AC or nonAC. They were all AC versions and boy do they BLOW. It was like a wind tunnel with the new blower motor.

Huck · 01-03-2004, 12:40 PM

If you have tons of junk in the air passages, a new fan motor may not help much. As I recall (somewhat foggy here) you can pull the fan motor on a non-A/c truck without too much trouble from under the hood. May have to remove the hood hinge asm. On A/c trucks believe you need to drop the pass side inner fender a bit by removing the rear bolt, and the wheel arch bolts/bolts to fender but you can leave the three front bolts to rad support--.
You can then see what is happening. I will say that if the air passages are clear and the thermostat is working, an original fan will work fine. I've seen motor fans chewed into pieces from mice. I removed debris from every truck I've parted out~~ If you open the passenger side vent all the way and stick you hand thru the hole and down into the outer air box, you may find leaves, rags, dead mice, snake, tools, etc. Yep, found them all. You can also find all of the above behind the blower motor or up against the heater coil itself. Bet you find junk behind the fan~~~~

01-03-2004, 02:53 AM	#1
68c10owner Registered User Join Date: Oct 2003 Location: Carmichael, California Posts: 3,006	heater blower motor question my heater doesn`t blow hard enough to keep the truck warm. does anyone know where i can get a new blower or any other tips/tricks to get this thing blowing better? oh yeah, it`s a 68 non a/c. thanks Anthony __________________ Anthony

01-03-2004, 03:10 AM	#3
Solver Registered User Join Date: May 2000 Location: Storm Lake, Ia Posts: 1,449	either your high is out on your switch or my best bet is that your full of leaves and debris in the heater box. They plug up after a few years of leaves and such falling down the cowl. __________________ 1972 Cheyenne Super 20 LWB-Blue 1972 Cheyenne Super 10 LWB-Black 1972 Cheyenne Super 10 LWB-Red 1972 Cheyenne Super 10 LWB-green 1972 GMC 4x4 LWB-White 1971 Cheyenne 10 LWB-Ochre 1971 Cheyenne 20 Longhorn-Copper 1971 Cheyenne 20 Longhorn-Black 1969 Custom 10 LWB-lt blue 1968 GMC 3/4 ton-green 1968 1/2 ton swb stepside-silver 1967 Chevrolet CST 10 LWB-green 1967 Chevrolet custom 20 LWB-Maroon

01-03-2004, 04:35 AM	#5
68c10owner Registered User Join Date: Oct 2003 Location: Carmichael, California Posts: 3,006	thanks for the info guys. whats the easiest way to get into the heater box and how do i test the switch? thanks again, Anthony __________________ Anthony

01-03-2004, 07:23 AM	#6
GMC Jim Senior Member Join Date: Dec 2002 Location: Portland, Oregon Posts: 901	There is a considerable difference in A/C and non A/C blower motors....The Heater only blower motor specs are :- 6.25 amps max and 2550/2950 min/max RPM. The A/C blower motor:- 16.5 amps and 3700 RPM min. Most GM blower motors are interchangeable and can be gotten quite reasonably from most salvage yards. __________________ '71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal).

01-03-2004, 11:42 AM	#7
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	But is a used one worth the trouble when a new one is less than $20. I got a new one from NAPA last year. They no longer differentiate between AC or nonAC. They were all AC versions and boy do they BLOW. It was like a wind tunnel with the new blower motor. __________________ 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

01-03-2004, 03:05 AM	#2
JOE BOB Registered User Join Date: May 2000 Location: Ballston Lake, NY Posts: 161	Anthony, I have read on the baord here that certain year Cadillac's are a perfect fit, but are more powerful. Also, is there a different blower motor to order for an A/C truck? I would imagine they would be more powerful. Good Luck, Joe Bob.

01-03-2004, 03:15 AM	#4
scott67swbtx Registered User Join Date: Sep 2003 Posts: 5	I had the same problem with my heater about a month ago...mine was not blowing hot air ...ended up pulling heater assembly(inside engine compartment) found birds nest in there.....blows pretty hard now and a hole lot warmer

01-03-2004, 12:40 PM	#8
Huck Senior Member Join Date: Jun 2001 Location: Shelbyville, KY Posts: 3,269	If you have tons of junk in the air passages, a new fan motor may not help much. As I recall (somewhat foggy here) you can pull the fan motor on a non-A/c truck without too much trouble from under the hood. May have to remove the hood hinge asm. On A/c trucks believe you need to drop the pass side inner fender a bit by removing the rear bolt, and the wheel arch bolts/bolts to fender but you can leave the three front bolts to rad support--. You can then see what is happening. I will say that if the air passages are clear and the thermostat is working, an original fan will work fine. I've seen motor fans chewed into pieces from mice. I removed debris from every truck I've parted out~~ If you open the passenger side vent all the way and stick you hand thru the hole and down into the outer air box, you may find leaves, rags, dead mice, snake, tools, etc. Yep, found them all. You can also find all of the above behind the blower motor or up against the heater coil itself. Bet you find junk behind the fan~~~~



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