Question about 1998 Ford Explorer

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Heater was working fine..then shut if off...when i turned it back on it just blew cold air, i know its not a thermostat, water pump, or head problem cause it doesn't overheat...checked fluid levels and they are full the economy control is computerized

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There is a part called the air temperature blend door inside the air ducting of the dash, it controls the air temperature by moving between the AC Evaporator core and the Heater core, it is broken or the electric actuator is defective that moves it or more commonly both are defective. To replace these parts requires the dash be removed from the truck. This is a VERY common problem with 1995 up Explorers.

Posted on May 20, 2011


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About the only thing left is the water pump.

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I have a 2003 alero with the v-6 what happened was driving down the road the heater works fine. then all of a sudden it was blowing cold air and the temp gauge started climbing. it started blowing how air...

Sounds like the water pump is cavitating . Replace water pump. Check coolant level also. Open the bleeder valve usually located on thermostat housing to remove air from system. close valve when coolant is present while filling. close radiator cap and top off recovery bottle to correct level. These engines are prone to overheating, do not let temp gauge get in the red.

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After 40 mile ride engine started to overheat. Heater blew cold air.

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ZaThe car has water and has been running fine until

Hi the first thing you need to check is the thermostat if this stays closed then the coolant wont circulate around the engine properly and this will cause it to over heat.

to test the thermostat you need to remove it from engine and then have a look at it so you can see that it is closed in the middle then boil some water and place the thermostat into the boiling water leave it in their for couple of minutes then take it out and have a look at the middle part it should have now opened up to allow water to pass through if it dont open then it will need replacing.

that is the most likely cause how ever if the thermostat is ok then it will be one of the following faults

it could be

faulty water pump
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or worse case it could be head gasket failure

if it comes down to the head gasket being at fault then you need to check thermostat and water pump as the main cause of head gasket failure is due to one of these faults.

try this first get the engine who by leaving the car running then turn the heater onto hottest setting and turn it on if the heater blows out cold air then the thermostat needs replacing if it blows out hot air then the chances are the thermostat is ok and you then need to check the other possible causes i listed.

let me know if you have any problems ok

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1 Answer


It is most probably the problem with blend door or blend door actuator. But just in case I would suggest to follow the entire procedure:

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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My heat is not working. Its throwing out very cold air now. It happen before and i replace thermostat and blew air threw heater core. I blew air threw heater core the other day now its throwing out real...

It sounds like your heater core is stopped up, or be sure your coolant is flowing, and picking up heat from your engine...Thermostat, water pump, etc.

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