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I have a 1998 F150 with 5.4 and the heater will not blow hot air and the temp gauge never gets above normal. I have changed thermostats and flushed the cooling system. The heater will not blow hot air, not even after a 100-mile drive.

I have a 1998 F150 with 5.4 and the heater will not blow hot air and the temp gauge never gets above normal. I have changed thermostats and flushed the cooling system. The heater will not blow hot air, not even after a 100-mile drive. No one can tell me what to check for. Any suggestions will be very helpful.

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The heater core may be plugged with rust. Have the system flushed. If the heater core begins to work, great! If it begins to leak after the flush, replace it. Heater core failure is a common Ford truck issue.

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—Jim O’Neill
Chino Autotech Inc.

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