Heater issue???

[VikingWarrior2004]

Hey all, not a real big issue now that summers a comin', but my heater blows cold air at idle, but soon as I get movin and the rpm's up it blows hot air. Truck is fully warmed up also. Any ideas, havent' brought it in at all. 04 CC

[Jared]

check your coolant level, if thats ok then take it your dealer/mechanic. these trucks have multiple thermostats as well as an additional heater pump that works at idle so low heat issues can be difficult to diagnose at times.

[TitanTech659]

Probably just air in the system due to low coolant level caused by a leak somewhere like the radiator cap or something.

[VikingWarrior2004]

I do have a small leak coming from the bottom of my cheasy plastic radiator!!! Sounds like I need to add coolant and/or fix the leak, any way to fix the MINOR leak with like JB Weld or some kind of sealant, rather than drop a few hundred on a new radiator, warranties up long time ago!

[madahajimoto]

Im having the same problem after fixing my radiator cap leak. I tried bleeding the system numerous times with no luck. I only have heat at 90 though. Does anybody know the correct way of doing the bleeding of the system?? I jacked up the p/s with the truck parked uphill and just took the reservoir cap off and left it running for 15 minutes filled up to the top. It still does it.