I had this problem a few years back. The garage had to replace what the dealer calls the blower resistor. It was actually a circuit board that lies under the dash. Under extended warranty cost $79 for the part. Can't remember what the labor cost.
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Check good voltage and ground for blower motor. Actuators under the dash may be restricting air flow? High speed doesn't usually use a resister.
Check for hvac trouble codes, in my part of the country, some of the national brand autostores will check codes for free, if there are any.
If you think problem with blower motor, itself, replace it. Sometimes, you can remove blower motor, use jumper wires for voltage and ground, using inline fuse, come off the battery, see if it blows like you think it should?
It could be the blower motor resistor or even the blower motor. If you hear the air blowing with the glove box open but, none can be felt, check the cabin air filter. This filter can become clogged with leaves and debris that enter the HVAC box. The filter is located underneath the dash near the blower motor. The reason for some air flow after you hit the dash is it must be clogged and it clears enough to allow for the small amount of air to pass.
Sounds like a faulty blower motor, however it could be a bad connetion somewhere. The next time it doesn't blow, tap the blower motor lightly with a hammer or the handle of a screw driver. If it starts up, you definatly have a motor with bad brushes, and the easiest thing to do is replace it.Good luck , and contact me with any furthur questions.
first feel the heater core hoses see if both are hot if so then your problem is in the blend air door must be stuck on cold. is your blower motor blowing cold air if not your blower motor might be the problem. the blend air door is down by the blower motor.
the pipes are so cold because the blower motor is not working .. that tells you your air conditioner is otherwise ok ... i have seen two problems that cause your symptoms .. one is the blower motor is simply bad (they dont last forever) .. it is likely enclosed somewhere near the passengers knees ... it usually comes out with several screws arranged in a (maybe 6 inch) circle (sometimes in the engine compartment) .. there is an electrical plug that can be unplugged also.. .. new blower motors are usually available at auto parts stores .. another thing that can cause the same trouble .. on some cars there is a resistor block .. this is a ceramic part about 2 or 3 inches long .. it has severral wire wound resisters moiunted such that different ones can be selected by the blower speed control .. if this resistor block opens up then the blower motor quits .. you can just look at it for signs of damage.. even without the blower motor running you should be able to get cooling if you select external air (not recirculate) and drive fast enough to keep air flowing through the vents .(maybe crack a back window) . when you are stopped you have to turn off the air conditioner to avoid the icing condition you mentioned .. ps. i loved it in okc for a year ..
hi the blower motor is under the right side of the dash
remove the hush pannel
you don't have to remove the blower motor but it does give you more room
disconnect the wiring to the resistor there are two 5.5mm bolts that hold the resistor in
remove the bolts and slide the resistor out
install the new resistor and reassemble
hope this helps