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I am by no means an expert on this so take it for what it is worth:
1) Check the Antifreeze in your Radiator, it may need to be replaced. One thing that Auto Mechanics do to their cars is to add Dot 3 Brake fluid to their Radiators once a year (500ml). It is made of ethylene glycol. this evaporates out of your radiator when it is hot or when the Temperature in the environment is high (Summertime). Test the Anti-freeze before you do it, it won't be clear or green as it was when it was fresh. Wait about a week and test it again, it will look and test like new. DON'T DO THIS IF YOU HAVE PUT ANY TYPE OF CHEMICAL TO STOP LEAKS IN THE RADIATOR!!!
2) The Thermostat may be broken.
What else can I help you with?
Why would the heater in a 2000 neon blow warm air but never get hot?
Faulty thermostat. Plugged heater core. Temp blend door malfunction.
2000 Ford Windstar Why does my back heater not blow at all?
The blower on the back heater may need to be replaced on the 2000 Ford Winstar.
Why would a 2000 GMC Envoy heater only blow cold air?
check you antifreze level if it is low you wont have eat or if you get lots of fog your heater core is bad
Why does heater in a 2000 Dodge Neon only blow cold air?
you may not have the heater water hoses plugged in
Why won't my heater blow hot after a coolant flush and changing of the thermostat in a 2000 Taurus?
probably the heater core is clogged
What could be the reasons that your 2000 Jeep Cherokee heater would randomly blow cold air and then hot air and then cold etc?
One of the reasons a 2000 Jeep Cherokee heater would randomly blow cold air and then hot air and then cold might be that there is a problem with the hot/cold duct. The air or a vent might be inadvertently blowing periodically.
Why would hot steam blow from the heater vents?
Leak in heater core. Replace core.
Why would a back heater blow cold air and front heater blow hot air in a 2003 Chevrolet Suburban?
The front expansion valve is clogged.
Why would you smell antifreeze and heater blow cold air?
heater core possibly plugged and leaking
Why would a house heater blow out cold air?
It doesn't really blow it out it just warms the cold air.
Your heater will not blow on your 1996 Ford Contour?
heater will not blow on a 1996 ford contour
Why does your heater not blow out warm air?
if the heater does not blow out warm air change the setting.
