Join Date: Sep 2008
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My first thought was the heater core, too. I've had to do this a couple times on my wifes Bravada to check for the heater core clogging up...the theory still applies to ours. Open the hood and locate the hoses that go through the firewall to the heater core. There will be two of them. Once you know which hoses your looking at, start the truck to warm it up. As the truck is warming up, you are going to want to start feeling the hoses periodically for them to increase in temp. If both hoses are getting hot, then more than likely the heater core is not clogged, or at the very least has some flow going through it. If one hose is getting hot and the other is still cold, then you got a clog. It's easier to feel a difference if you do this test when the engine is completely cooled down, like over night. If it is clogged, then post back what you felt and there may be a couple options you can do without having to take it somewhere to have fixed. Like I mentioned above, I've had to deal with this several times on my wifes Bravada and have tried a few things that work.
'97 Dodge Ram 2500 4x4 12 Valve, 215 Pump, 16 deg Pump Timing, NV4500 5-speed, ISSPRO Gauges, #10 Plate, AFC Spring Kit, Amsoil #4510 BHAF, 4" Turbo Back Exhaust, KDP more to come...