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I just installed a remote car starter in my 2005 Avalanche. When I use the remote start, the truck engine warms up in about 5 minutes or so, but the blower only blows cold air until the RPM's are increased. No matter how long I let the truck idle, it just blows cold air. As soon as I jump in and take off - I get hot air immediately. I even tried bringing the rpm's up while in park, and then I get hot air, but while the truck is at idle....nothing but cold. Any ideas?


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Sounds like the coolant level is low.


   
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If coolant level is good, you have a restricted heater core. Get a flush service done, or do it yourself by removing heater core hoses and run a garden hose through it to blast into it to flush out all the gunk.


   
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