1999 Ford Taurus Q&A
1999 Ford Taurus Question: taurus with no heat
I have a 99 taurus with heat issues. When the car is sitting still for a long period of time the heat will work prety well. As soon as the car begins to move, the temp guage nose dives and the heat blows ice cold. The thermostat has been changed, blend door is working correctly, heater core is working just fine, fresh coolant at the correct level also. We are kind of stumped at this point. Any ideas? - sheila82
Sounds like the cooling system is working too well. Since the radiator is where the heat is removed from the coolant, it seems as though the radiator is working too well. This could be from the fan staying on all the time, or the coolant is moving through the system too fast, thus being too efficient. You can try a thermostat that allows the engine to run hotter, and make sure the fan is not coming on too soon or staying on too long. The coolant should also be mixed properly, 50% water, 50% coolant. Good Luck, and thanks for providing excellent info about the problem your experiencing! - munkyrench
Just joined here so this might be a bit late but couldn't the problem be from low coolant. I remember my mechanic telling me that the car will run cool if the coolant is low? Thus the reason the temp gauge drops when the engine is at higher rpms. - Maineman
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