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05-05-2016, 07:27 AM
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#1 |
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Registered User
Join Date: Oct 2015
Location: Lincolnshire, IL / Burlington, WI
Posts: 209
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A/C heater fan blower switch mystery????
Anyone have an idea why my fan blower switch works on the "off, low, mid" speeds but cuts out when in the "high" fan speed?????
__________________
1970 C-10 CST, LWB, 402/400, A/C |
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05-05-2016, 08:17 AM
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#2 |
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Registered User
 
Join Date: Aug 2013
Location: Atlanta, GA
Posts: 702
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Re: A/C heater fan blower switch mystery????
Check the high speed relay on the right side of the air box under the glovebox. Could be a bad relay, bad harness or loose ground. It grounds through the harness to the blower motor.
__________________
1968 C10 292/3 spd - sold 1969 K10 350/3 spd/205 - sold 1971 K5 350/4 spd/ 205 - sold 1970 K20 350/350/205 - sold 1969 K20 396/400/205 - work in process |
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05-05-2016, 09:15 AM
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#3 |
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Moderator
 
Join Date: May 2007
Location: Southern Cal
Posts: 20,058
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Re: A/C heater fan blower switch mystery????
Relay is either bad or not grounded.
__________________
1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man RIP FleetsidePaul |
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05-05-2016, 09:40 AM
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#4 |
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Registered User
Join Date: Oct 2015
Location: Lincolnshire, IL / Burlington, WI
Posts: 209
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Re: A/C heater fan blower switch mystery????
Thanks guys, I'll check the relay.
__________________
1970 C-10 CST, LWB, 402/400, A/C |
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