Question about 1999 Ford Taurus

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Heater blows out cold air when on the warm setting ,possibly a plugged heater core

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  • Ford Master
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Yes this is very likely the problem, have you check your cooling system is it rusty? if so the heater core is plugged, take the inlet and outlet hoses off the core at firewall and use a garden hose to clear it, then have the cooling system flushed if rusty.

Posted on Jul 23, 2009

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  • Master
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Find the heater core hoses there are two in the engine compartment.get the engine hot,turn on the heater blower system,then feel on the two hoses they should be hot.If one is hot and the other is cold you probably need a new heater core.Some times you can take the hoses off and run water through them and un clog them,most of the time they have to be replaced.

Posted on Jul 23, 2009

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  • Ford Master
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You have air trapped in system. Try parking uphill, loosen radiator cap (cold engine). fill radiator and reservoir. warm up engine until upper heater hose is hot. repeat a couple of times. make sure heater is on. for last cycle, tighten radiator cap, fill reservoir to fill level.

Posted on Jul 23, 2009

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1 Answer

The heater blows air, but it is always cold on every setting. What is going on with the heater?


Check coolant level first for being low. IF level ok, possible plugged/restricted heater core. With engine at operating temperature, check hoses under hood going into heater core. They should be close to the same temperature. If one is hot and the other warm/cold, suspect a restriction in the heater core and you will require a back flush to remove the restriction. If both hoses warm/cool, suspect a thermostat issue and the engine will not reach proper operating temp to supply adequate heat.

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First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.

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