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You can check to make sure the radiator fluid is up to the correct fill level. Also be sure that the coolant/water mix is within the suitable ratio parameters. There is an inexpensive tester at all reputable autopart stores for that. You can also check to see if your thermostat is functioning properly. If it is not then your heat may only get slightly warm and may not heat up at all. Sounds like a thermostat.

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โˆ™ 2005-11-18 00:28:33
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Q: Your heater in your 1998 f150 does not get hot in defrost and panel only slightly in heat mode What can you check for proper operation?
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