SOURCE: Ford Expedition 2002 Front Heater blows cold air below 45 MPH
impeller is made of plastic on teh water pump and its slipping and spinning on the shaft renew before weather warms up as engine will overheat
SOURCE: heater problem 2005 grand caravan
check the coolant level, I had the same problem low coolant level.....no hot water to the the heater coil.
SOURCE: Temperture Gage
First of all, it doesn't sound like your thermostat is working correctly to keep good hot/warm air coming , so I would change that, or have it changed for better heating inside. If you lift the hood & look in front of your radiator, On the engine side, you'll see a fan attached to, or in front of the radiator. It won't come on until the coolant temperature gauge gets up to proper operating temperature. Without getting in to too much detail, have your thermostat changed, and my guess is everything else will start working as it should, and whoever does the work, should know enough to check the fan operation when they do the thermostat.
SOURCE: temperture gage reads hot heater blows cold air
. make sure valve on hose to heater from radiator is all the way open.
SOURCE: A/C hot and cold air....
Technical Information: When the engine overheats (goes above 220 to 230 degrees), the ECM (Engine Contro Module) will disable the AC (won't let the compressor engage). This is a safety feature of the EMS (Engine Management System) to reduce potential damage to the engine from an overheat condition. Check your coolant level in the radiator & reseviore -- Low coolant level can produce the symptom you describe -- if low, top them off. Inspect your radiator hoses/cooling system for any signs of leakage (crusty deposits of dried coolant). Wherever you find this, that's where it's leaking. If you don't find any signs of leakage, replace the thermostat (& gasket if required (as a precaution) anyway. When the engine overheats, both cooling fans should come ON HIGH! If they aren't/don't, something's wrong and you need to find the cause. Every two to three years the cooling system should be flushed and inspected to ensure proper operation/condition and system protection. Overheating can seriously damage the engine. $$$$. An ounce of prevention is worth a pound of cure.
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