Question about 1998 Chevrolet K1500

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2004 Tahoe Heating Problems

I have an 04 that is having some heating issues. Rear blows cold air, front blows below luke warm air. I noticed once I am going the heat warms up, but I noticed if I go through a drive-thru the air becomes below luke warm again. I have had it to the dealer 3 times and they are unable to locate the problem. I have 4 children taht are constantly stating they are cold. What the heck is going on with the heating system in these Tahoe's? I noticed my thermostat gauge reading a little above normal yesterday. So I am having my husband switch out my thermostat. Just maybe this might fix this issue. If not, then I will be taking it back to the dealer for them to find out what the heck is going on with it! Frustrating!

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Did you open the radiator cap and make sure the radiator is full of coolant? Sometimes the hose from the coolant reservoir to the radiator becomes plugged, and the radiator will become low on coolant even when the plastic reservoir is full. Low water levels will prevent the coolant system from getting hot water from the engine to the radiator or heater cores. This will cause the engine to run hotter while the heater appears to not be working.

Posted on Feb 15, 2009

  • Jeremy Feb 15, 2009

    One more thing to consider: If you have a failing or damaged water pup, it may be that at higher RPM's it pumps enough coolant to keep the engine cool and the heaters working, but at lower RPM's (IE: Sitting in the drive though) it's not spinning fast enough to keep coolant running through the heater core and radiator.

    Also, regarding the thermostat: The thermostat only controls water flow to the radiator. Coolant will run through the heater cores regardless of whether or not the thermostat is open or closed (or even working). The fact that your heaters aren't working well is a solid indication that the thermostat is not the cause of the overall issue.


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