How Do I Troubleshoot A Heater In A 2000 Jimmy When Fan Works And Can't Get Heat?

1st question, do you feel air at the dash vents, your feet, or the inside surface of the windshield. Next, locate the heater hoses under the hood. After the engine has warmed up, are they hot (there are two of them)? We old-timers used to take the cooling system thermostat out and toss it in the garbage at the first sign of an overheating problem. Which meant and still means - no heat in the winter time. More importantly, on ALL newer computer-controlled vehicles, the thermostat is absolutely essential to the proper operation of the fuel injection, engne management and emission control systems. Ensure that your car has one, if not, get one installed - 195 degree F. This should be original equipment and provide you with heat! If this doesn't solve your problem, let me know. Tradmaster