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Author Topic: 92 Chevy Silverado Heater ?  (Read 1333 times)

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Offline 223fan

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92 Chevy Silverado Heater ?
« on: June 19, 2010, 11:24:54 AM »
The heater in my silverado clicks whenever the ignition is turned on or off,the heater doesn't have to be turned on for this to happen.I was thinking maybe a relay going bad somewhere,I would apreciate your thoughts on this.Thanks
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Offline Lloyd Smale

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Re: 92 Chevy Silverado Heater ?
« Reply #1 on: June 19, 2010, 03:00:19 PM »
you dont really turn the fan off in the older chevs. Its allways on. All your doing is putting it on low
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Offline Dee

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Re: 92 Chevy Silverado Heater ?
« Reply #2 on: June 19, 2010, 04:52:14 PM »
I don't have one now, but had one. I would be interested in the answer. Has it always done that 223, or did it just start?
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Offline 223fan

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Re: 92 Chevy Silverado Heater ?
« Reply #3 on: June 20, 2010, 05:28:52 AM »
No it worked fine up till about a week ago.The sound comes from the passanger side of the truck down where the heater core is.It sounds like a door in there is opening and closing,it'll do it for 30 or 40 seconds when ever the truck is started or turned off,or when the heater is turned on or off.
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Offline Dee

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Re: 92 Chevy Silverado Heater ?
« Reply #4 on: June 20, 2010, 08:57:12 AM »
Oooooooook. Does the term actuator motor or valve ring a bell? I would guess that will be your problem.
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Offline Rex in OTZ

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2003-2005 Chevy Heater/blower problems
« Reply #5 on: September 20, 2011, 10:05:32 AM »
#04-01-38-008: HVAC System Cannot Be Controlled Or Defaults To Defrost Mode (Repair HVAC Actuator Harness) - (Jun 17, 2004)
Subject: HVAC System Cannot be Controlled or Defaults to Defrost Mode (Repair HVAC Actuator Harness)

Models: 2003–2005 Cadillac Escalade, Escalade ESV, Escalade EXT

2003–2005 Chevrolet Avalanche, Silverado, Suburban, Tahoe

2003–2005 GMC Sierra, Yukon, Yukon XL

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Condition

• Some customers may comment that they cannot control the HVAC (heating, ventilation and air conditioning) system. Others may comment that the HVAC system defaults to the Defrost mode.

• Technicians may find that the following diagnostic trouble codes have set:

• B0229 Recirculation Actuator

• B0414 Left Air Temperature Actuator

• B0424 Right Air Temperature Actuator

• B3770 Mode Actuator

Cause

The HVAC actuator harness may contact a sharp edge on the instrument panel support brace, causing a rub through condition and a ground out of the actuator control and/or feedback circuits.

Correction

Locate the HVAC actuator harness contact point shown by the arrow in the above illustration. The illustration is of the instrument panel with the instrument panel compartment door opened and folded downward. The actuator harness is located in the left side of the opening in the instrument panel.

Technicians are to inspect the HVAC actuator harness for contact with the instrument panel support brace. Repair any damage to the actuator harness wiring and install protective plastic conduit over the harness. Install friction tape over the sharp edge of the instrument panel brace. Clear the diagnostic trouble codes and verify proper HVAC system operation.
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