01 burban front and rear HVAC. No heat upfront Heat in rear only ???

[bayareadude84]

New one to me ???

I have a 01 Burban with front/rear A/C RPO C68/C69

At moment, I Only have heat in the rear back section but none up front drivers area ?? Want to fix ASAP suppose to get ufkin cold this weekend and taking a 3 hour road trip

no heat through front defrost vents or anything ??

So is it a Blend door issue or heater core ??

 

[S33k3r]

Check fuses first. If no air is blowing up front, at all, aside from fuses, the next most likely thing is your blower motor resistor, and/or 5he blower motor itself.

 

[bayareadude84]

Check fuses first. If no air is blowing up front, at all, aside from fuses, the next most likely thing is your blower motor resistor, and/or 5he blower motor itself.

it does blow out air but only blows room temp air or A/C but no heater up front no hot air??

 

[corvette744]

I 2nd the resistor almost guarantee it or the plug is melted very common.New one comes with new plug you have to splice in the wiring.

 

[Fless]

I think what he's trying to say is that the front blower works, but there isn't any hot air up there. "No heater up front" could mean a lot of things.

 

[bayareadude84]

I think what he's trying to say is that the front blower works, but there isn't any hot air up there. "No heater up front" could mean a lot of things.

Yes, heat works fine in the rear but not upfront ???

 

[Fless]

Yes, heat works fine in the rear but not upfront ???

Not to kick a dead horse, but it would help if you would be more specific. "heat works...but not upfront" does not tell us if the fan (blower) is working, or if it's just a cold air / hot air temperature problem. Two very different diagnosis paths.

 

[bayareadude84]

Not to kick a dead horse, but it would help if you would be more specific. "heat works...but not upfront" does not tell us if the fan (blower) is working, or if it's just a cold air / hot air temperature problem. Two very different diagnosis paths.

Blower fan works fine upfront just no heat ?? just outside air and A/C work upfront heater is INOP upfront but works fine for rear passenger's ?? My truck has front and rear HVAC


Dave

 

[MassHoe04]

Do you have single zone up front or the dual zone (driver/passenger)?

May be a blend door/blend door actuator issue. It might be stuck and only drawing in cold air from outside. Plastic tabs on blend door can break, the gears could be stripped or the motor died in the actuator.
Failed actuators seem to be a very common problem.

If it is the one on the bottom of the front heater box, that is a cheap and pretty easy part to swap out.
If it is the one on the top, it is still cheap, but a little more involved (not hard just more stuff to get out of the way and work around).

If others think this might be you issue, start looking up "how-to" threads on this forum and some videos on Youtube.
You could do it DIY.

I have seen people with access to a welder (or friend with a welder) take a socket and weld it to a flat bar, in order to get the top bolt out of the actuator on the top side. That home-made tool allow you to get in the tight space on top and not have to pull the top dash panel off.

I hope you find out what the solution is! Keep us posted.

 

[olemRmIkE]

I have this same issue in my 2008 tahoe. Its intermiten when temps are from about 30 to teens and no heat if its colder, but heat blows well if its above 30. Pretty wierd...
I have the dual climate control in the front, recently new thermostat plent of heat in the rear