Randomly switches to heater - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Truck Guy99 · 08-23-2014, 07:17 PM

05 Silverado 1500 So sometimes riding down the road with the AC on the middle and far left vents start blowing out hot air and then suddenly it'll go back to AC. How can we fix it?

**Bob B.** · 08-24-2014, 01:16 AM

Usually, that is caused by a bad temp. actuator. There are 2 of them, one on top on the heater-A/C box behind the radio that controls the right side, one on the bottom of the box near the center of the dash that controls the left (driver's) side. Sometimes, the problem can be the controller. The problem is none of these parts are cheap. The actuators are over $200 at the dealer (NAPA has an aftermarket one for about $150, I have tried them and they seem to work O.K.). Controllers are over $200 new as well.

gldevall · 08-24-2014, 04:34 PM

Its this one.."one on the bottom of the box near the center of the dash that controls the left (driver's) side." About $30 at Rock auto and 15 minutes to change. No biggie.

**Bob B.** · 08-24-2014, 05:37 PM

Quote:

Originally Posted by gldevall

Its this one.."one on the bottom of the box near the center of the dash that controls the left (driver's) side." About $30 at Rock auto and 15 minutes to change. No biggie.

$30? Thanks for that tip!

08-23-2014, 07:17 PM	#1
Truck Guy99 Registered User Join Date: Aug 2011 Location: Elk City, OK Posts: 332	Randomly switches to heater 05 Silverado 1500 So sometimes riding down the road with the AC on the middle and far left vents start blowing out hot air and then suddenly it'll go back to AC. How can we fix it? __________________ My names Tye. No Chevy right now

08-24-2014, 01:16 AM	#2
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,309	Re: Randomly switches to heater Usually, that is caused by a bad temp. actuator. There are 2 of them, one on top on the heater-A/C box behind the radio that controls the right side, one on the bottom of the box near the center of the dash that controls the left (driver's) side. Sometimes, the problem can be the controller. The problem is none of these parts are cheap. The actuators are over $200 at the dealer (NAPA has an aftermarket one for about $150, I have tried them and they seem to work O.K.). Controllers are over $200 new as well. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.

08-24-2014, 04:34 PM	#3
gldevall Registered User Join Date: Mar 2003 Location: Walker, LA Posts: 2,925	Re: Randomly switches to heater Its this one.."one on the bottom of the box near the center of the dash that controls the left (driver's) side." About $30 at Rock auto and 15 minutes to change. No biggie. __________________ Gary -1986 SWB: lowered 4/6, SOLD!!! -Best 1/4 mile: 14.51 @ 91.01 MPH -2001 Pewter Tahoe, billet grill, Corsa Sport Cat-back, K&N FIPK SOLD!!! -2004 Z-71 Extended cab with a flowmaster, BDS 6.5", 3" BL, 35x12.5x18 Trail Grapplers on Pro-Comp 18x9 wheels



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