Question about 2002 Jeep Grand Cherokee

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The problem-very little cold air is coming out the dash vents. I put in a new motor and it's turning fast and vibrates. New resistor. Removed entire HVAC from the car. The gate valves for the different doors appear to check out OK. I'm at wits end. All the linkages were attached and none seem to be broken.

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Try switching the leads to the blower motor. If the leads were reversed and the motor is turning backwards it will move little air. Its worth a shot to try.

Posted on Aug 07, 2010

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1 Answer

07 Saturn Aura XR The fan on the climate control is not working When I turn the temp up hot air slowly comes out of which vent is selected and cold air when i turn it down But the fan will not work


Your Blower Control Module/ Blower resistor is probably bad. It controls fan speeds. The blower motor itself could be bad, I doubt it unless it was making noise previously. The blower resistor is under the passenger side dash.

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Why is air coming from all three areas (vents/floor/defrost) regardless of setting?


There is actually two blend door actuator that control the opening and closing of your vents. Ine is located under the drivers side dash board. The is on the passengers side. Both are electric and I didnt have the money to replace them so i removed them and turned it with a pliers to allow heat to come out of bothe sides of the vent. Then come summer flip the little bar back the other way to A/C
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Evaporator coils freezing up


no year, stated, nor model car. no engine size or country.

blown fuse.

there are lots of honda back to 1973, just a clue here.



if the heater blower stalled it can burn up.

what info, easy, the FSM , no FSM work blind

or use alldata.com , login and read, it .

smell from where, under hood or dash, gee?

the new resistor will stick until burned in, they smell like hot metal

and are. it just nichrome wire resistor and run very hot.

and are air cooled so the resistor dont burn up.

so a shop would make sure the motor (fan) is good first.

and make sure current is not over 15amps. motors can in fact

partially short and draw too much current not just go dead.

then the resistor, not first.



"but got hot" what got hot,. the cab air exiting the vents, the motor fan

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My blower motor works sometimes, but sometimes not. It seems to work better if I am at higher speeds for a while. Is this most likely a blower motor or resister issue?


bet on the motor on this one,sounds worn,at higher speeds the vibration can help the brushes in the blower motor work better.
you can test my theroy by giving the blower mortor a sharp tap while its running to see if it increases in speed.
if it does then you have your answer.
the brushes in the blower motor build up carbon deposits over time and cause the motor to slow down.by tapping the motor the deposits release and allow the current to flow more freeley.
good luck,Gary

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Heater&air conditioning vents wont reach position make a clicking noise have no heat or air how do i fix? 2003 ford explorer


The clicking noise you hear is a stripped out plastic gear from the blend air door motor almost every car maker now uses little electric motors to control heater door panels,put it in the position for it to make noise go under your dash find where it is usually externally mounted remove it and replace it cost about 30 dollars at the dealer.depending on which of the 3 motors its is usually not hard to do.

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1 Answer

Air is barely blowing out of the vents, hot or cold.


The blower motor resister shorted out common problem. It is located behind the glove box on the HVAC assembly.

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1 Answer

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This is actualy strange because the heat and a/c are different systems. If someone came to me with this problem first I would ask did it happen at the same time ? Then I would check the Blower Motor & Blower Motor Restistor. Do you feel the air coming out of the dash ? can you still turn it up and down ? If not both a/c and heat are working you just need to replace the blower motor and blower motor resistor. always replace both at the same time each can make each go bad you dont want to put a new blower in there and have the old resistor ruin it in a day.

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1 Answer

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This is a blend door problem, this door diverts air either throgh the heater core or the AC accumulator core, it either provides hot, cold or a mixture or blend, this door is deep in the dash and in most cases the dash must be removed to service the little electric motor that operated the door.

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