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actuator again?

man00
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man00 Enthusiast

man00

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Couple years back my 2006 silverado  would only blow hot air through vent even when A/C was on.

I replaced the actuator and it was fixed. not when heat is on only cold air coming in...

Will that be the same actuator again (one near floorboard) ?

Thanks

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richard wysong Senior Enthusiast

richard wysong

Posted
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could be that, a bad  thermostat, clogged heater core. does the temp gauge read normal? if so check the heater hoses close to the firewall, they should be about the same temp with the engine warmed up and running at a high idle. if 1 is cooler than the other the core is clogged and needs to be back flushed. if thats ok do the actuator, 

man00 Enthusiast

man00

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Posted (edited)

Engine temps are normal, after going down the road for few mile all sudden hot air returns until the next time you start off down the road. Would be the same actuator again if heater hoses check out?

Edited by man00
richard wysong Senior Enthusiast

richard wysong

Posted
Posted

if the coolant levels full then that actuators on its way out it sounds like. yes same 1, controls temperature blend door. if it has 2 zone controls it may have 2 of them

richard wysong Senior Enthusiast

richard wysong

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Posted

make sure the doors moving free if you change the actuator, I know I have had a few pencils that have fallen thru my vents over the years that will cause problems someday

swathdiver Senior Enthusiast

swathdiver

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Posted
On 2/5/2022 at 12:35 PM, man00 said:

Couple years back my 2006 silverado  would only blow hot air through vent even when A/C was on.

I replaced the actuator and it was fixed. not when heat is on only cold air coming in...

Will that be the same actuator again (one near floorboard) ?

Thanks

Probably, especially if an aftermarket actuator was used.

 

Do you have dual zone climate control?  If so, does hot air come out of one side and cold out of the other?

 

Could also be low on freon if both vents are blowing warm air.

man00 Enthusiast

man00

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1 hour ago, swathdiver said:

Probably, especially if an aftermarket actuator was used.

 

Do you have dual zone climate control?  If so, does hot air come out of one side and cold out of the other?

 

Could also be low on freon if both vents are blowing warm air.

I have the two slider controls one for each side, when heater in on I get cold air out of both sides, when it decides to fail

swathdiver Senior Enthusiast

swathdiver

Posted
Posted
15 hours ago, man00 said:

I have the two slider controls one for each side, when heater in on I get cold air out of both sides, when it decides to fail

Ok, heat out of both sides when it fails.  Does the air start to come from different locations, floor, dash, etc. too?  If so that would be the Mode Actuator.  If both actuators are doing this, I would suspect the controller and before throwing money at it, would hook up a Tech-2 and pull the internal BCM codes.  They will tell you what failed and why.

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