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09-14-2018, 01:01 AM
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#1 |
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Registered User
 Join Date: Nov 2006
Location: KINGSPORT,TN.
Posts: 3,035
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Heater blower need help
My 72 c10 with a/c only has low speed on the blower. Just replaced the blower motor, same results. What should i do next. Never worked on a/c equiped truck before. All help is appreciated a bunch............
Thanks bob
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I BELIEVE IN JOHN 3:16 |
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09-14-2018, 01:25 AM
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#2 |
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Registered User
Join Date: Oct 2001
Location: Grapevine, Tx.
Posts: 2,142
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Re: Heater blower need help
BCOWANWHEELS
Check the ground wire from the relay inside the cab on the firewall. It is very short It is located up high between the glove box and passenger side wall. There is a short ground wire that is supposed to go one of the shroud bolts that come through the firewall Easy test is to attach a short piece of wire while it is on high from the relay to ground. A lot of folks do not get the ground re-attached correctly while working on the heater coil. The symptoms are Low= Low Medium= Medium High = Very SLow
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John Hutchison Grapevine,Texas 68 1/2 t swb 68 Mustang 69 Jaguar 71 1/2 t swb 88 Supra CompTs6m 93 Escort GT 2005 Corolla XRS |
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09-14-2018, 01:51 AM
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#3 |
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Registered User
Join Date: Nov 2006
Location: KINGSPORT,TN.
Posts: 3,035
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Re: Heater blower need help
I havent got nothing but low speed. Even with oem blower motor
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I BELIEVE IN JOHN 3:16 |
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09-14-2018, 10:53 AM
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#4 |
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Registered User
Join Date: Apr 2011
Location: Fairview Park, Ohio
Posts: 1,031
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Re: Heater blower need help
I'm not sure but do our trucks some a blower motor resistor? we know thats a very common problem on later models when one or more of the variable speeds go out.
isn't there something like a resistor that by the fan switch? edit: just looked it up. this is what you need. it's mounted to the back of the fan control area i believe https://www.classicparts.com/1960-72...iABEgLjq_D_BwE
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My build page http://67-72chevytrucks.com/vboard/s...d.php?t=764662 My cabinet building site http://www.cbcabinets.com |
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09-14-2018, 01:30 PM
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#5 |
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Registered User
Join Date: Nov 2006
Location: KINGSPORT,TN.
Posts: 3,035
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Re: Heater blower need help
I bet thats it, could somebody tell me exactly where its located. I,am crippled and movement is real tough for me.
Bob
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I BELIEVE IN JOHN 3:16 |
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09-14-2018, 03:31 PM
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#6 |
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Senior Member
Join Date: Aug 2004
Location: Centennial, CO
Posts: 2,988
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Re: Heater blower need help
Maybe the resistor, but I'd suspect a bad switch first. Hi doesn't go thru the resistor, but low does. The switch is easy to get to and test. No sense spending money without a quick continuity test of the switch.
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ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ |
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09-14-2018, 03:38 PM
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#7 |
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Registered User
Join Date: Nov 2006
Location: KINGSPORT,TN.
Posts: 3,035
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Re: Heater blower need help
Resistor is 10.00 at oreillys, i,ll check switch also. Thanks.
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I BELIEVE IN JOHN 3:16 |
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09-14-2018, 04:09 PM
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#8 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: Heater blower need help
Here are some good info pages.
Most times on a AC truck it's the switch. It's a easy fix. I have fixed many of them by taking them a part and cleaning the contacts and regreasing them. A lot of times it's the plastic connector gets hot and melts and the terminals want make contact also.   This shows you where everything is. 
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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09-14-2018, 07:09 PM
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#9 |
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Registered User
Join Date: Nov 2006
Location: KINGSPORT,TN.
Posts: 3,035
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Re: Heater blower need help
perfect............ you blessed me tremendously.......... thanks bunches
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I BELIEVE IN JOHN 3:16 |
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09-14-2018, 07:11 PM
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#10 | |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: Heater blower need help
Quote:
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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