No heat - ideas?

[Jewel or Jalopy]

Hey gang,

I just came back from a 1200 mile trip down to San Francisco and back, and the Tahoe ran like a champ the whole time. Hopped in it today and the heat isn't working. Not lukewarm, ice cold.

I just replaced the water pump and thermostat recently, and the coolant that came out was pretty clean, so I don't think it's a heater core issue. Plus it just went bang, good one day, cold the next.

Can anybody point me to a DIY on how to find, test or replace the blend door actuator? This is a 2004 Tahoe with full auto HVAC, and rear heat/AC as well. I looked around a little but didn't find anything, and this is our primary car.

Thanks!
Ian

 

[sumo]

check obvious 1st. Maybe your low on coolant or had a air pocket that trapped in the system. You just serviced items related and it may be related to your repair.

 

[chauncey0337]

Like Sumo suggested, first check the obvious. Does the rear get heat? If not, then it might be more involved than just the blend door actuator. Anyhow, here's a write up to replace it-
http://tahoeyukonforum.com/forum/showthread.php?t=15787