Check thermostat. Coolant and relay fand
SOURCE: 2000 Dodge Caravan air conditioner problems
heating and cooling fans are generally one and the same. changing freon doesn't always fix the problem... did you have the system pressure checked for leaks first.
Second determine if the vents are opening properly (switching from heat to cooling) basically when you change to cool it closes air access to the heater core.
Robert
SOURCE: 2002 caravan, heater problems
That was a common complaint a few years back, due to the fact that the heater core is a little too much higher than the engine, which requires that extra push it gets when engine RPM's increase. One thing I did do on my Caravan was remove my hoses to the heater core, and use a small external pump with hoses to circulate C.L.R. through my core for a while, then let it sit with CLR in the core overnight.Next day I circulated it through again, both ways by reversing hoses, and then re-attached hoses, bled air out of system, and notice quite an improvement in heat at idle. Once cleaned out, the heater core allowed coolant flow through it better at idle. If your stumped by explanation, take it to an automotive shop, or a Rad shop, and get a quote on flushing that core out for you. I recommend the CLR, but it might be too time consuming for you , but a flush will probably show some noticeable improvement.
SOURCE: 2003 Dodge Grand Caravan does
The problem is a bad transistor in the resistor module located in the air duct behind the glove box. Just replace the whole module. Mine was only $17 and a ten minute job.
Illb
SOURCE: 1999 chevy silverado the heater doesn't put out
more than likely your heater core is stopped up if you undo the two heater hoses and flush them with a water hose back and fourth till water is clear that should make it hot
SOURCE: No heat from the heater
check this site out !! http://www.automotix.net/partshotline-do...
your heater control valve might be faulty also. have a good day !!
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