Heater/air stop blowing after car is run for maybe 30-45 min.
Have replaced blower motor 3x, not apparent reason but when car is run for awhile, and heater or air are on and it blows well, suddenly stops blowing and just a very small amount of air comes out of defrost,heater or vents... can you help me, no one can fix this problem so far, replaced therostat, coolant, air conditioning coolant is full, can't get it figured out...blows great for a while...stopped in the middle of the mohave desert...on my way to ca
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check the fuse, or it could be your blower motor switch or the blower motor resistor. If its blowing air, but its not cold, then the heater hoses where they connect to your engine are clogged. inspect the heater hoses, and your water pump outlets for cloggs and corrosion blocking the flow of coolent.
Sounds like your heater blower motor is not functioning properly. At high speeds it's probably drawing air in from the outside then through the vents (defrost, etc.). If blower motor sounds like it's running, then maybe the squirrel cage (heater fan blade) is not spinning and in need of repair or replacement.
Yes I would go with the switch, BUT, does it have a resistor bank? That is, how does it reduce the speed? Many systems use resistors to lower the speed. Burnt or bad connections can cause this as well.
You can test the blower motor by connecting direct power from a source like the cigarette lighter if you are handy.
Most of the time the lower speeds konk out but the high speed continues to work this is the resistor bank that goes out.
The resistor that controls the blower motor. it is a small gadget that has a 2 or 3 wire plug . Replacing the resistor should fix your problem. It is on or near the blower motor. Under the dash. Not easy to remove . But it can be. Please give thumbs up if helped.
the heater control valve is not opening all the way.
look under the hood on one on the heater hoses .
you should find a vaccum controled heater hose valve.
make sure your not low on coolant also.
also make sure none of the heater hoses are pinched off.
if the fan is on and u get no heat have you tried to replace the thermostat , they gum up and stop working properly after awhile and that's the cheapest thing to try next..if the fan isnt coming on try tapping the blower motor maybe the brush's are froze and need a good tap on the housing to kickstart it..