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Heater blower runs on all settings but only gets warm when i am at speed when slowing down it goes cold straight away

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The heater core is blocked ,now what you do here is take off the two feed pipes ,use a couple of pairs of mole grips to seal them so you do not loose your antifreeze then flush the heater core with the garden hose on full ,yes i know its wet job if your not carefull but make sure you reverse the flow at least enough times till water runs clear and if you have a or can borrow a power washer use that even better ,you will see lots of brown muck coming out every time you reverse the flow .Now if this doesnt work all that well use a funnel with a pipe on one side and a length of pipe on the other thats hight than the funnel and then fill with a caustic solution and leave for a few hours then flush it all out this will work as i do it quite often .

Posted on Nov 11, 2010

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Heater blower will only work on high

You need a new blower resistor by the sounds of things. When you select the three lower speed settings, the current supplied to power up the blower motor goes through the resistor, to slow the speed of the blower motor down. When the high speed is selected, the resistor is bypassed, and full current is passed to the blower. I believe the resistor is $12 at an auto parts store. Good Luck Tim

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So I have a 2000 pontiac grand prix gt. I've only had it like a month and right away we notitced it didn't throw the greatest heat. Then, in the middle of a blizzard I left my car running to go check on...

If you have no speeds at all then I would suspect the blower motor is at fault (especially the thunk noise). If the blower resistor went you usually just don't have speed #1 and #2, but will have high speed. There is a slim chance the connector is at fault, but most likely the motor failed. It is located on the right side under the glove box. You will have to remove the right side kick panel, its a few screws holding it in (7mm socket needed). Then the blower motor will have 2 wires check for power and ground (purple 12V black ground). If you have power there on all speeds then the motor is no good. There are 5 bolts connecting the motor to the heater case (usually 5.5mm or 7/32nds socket needed). Pull straight down and replace. Good luck I've been to Winterpeg, stay warm.

Feb 24, 2011 | 2000 Pontiac Grand Prix

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When I turn the heater on burnt plastic smell from vents

It could be your heater blower motor or the blower speed regulating reisitor.
Try different blower speeds, see if the smell goes away. Also if one or more speed setting don't work, it is more than likely it is the resistor, if no to the tests, it is more likely to be the blower motor.
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Why would my 2002 Jeep Grand Cherokee only blow luke-warm to cold air when the fan is on high? First the heat went on the highest setting, so i used the second highest. Then it started to coll as...

Sounds like you need a blower motor resistor located down under dash on pass side next to blower motor. This is a comon problem and I have changed many of them. thats just the fan speed problem. Ive seen the blend doors break easily on those jeeps. thats inside the heaer core box and moves the flap from hot air to cold air. If it is stuck halfway -or mostly to cold- you may only get luke warm air. If they had the heater core out-maybe they possibly broke it.

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Heater/ blower on 1999 mitsubishi galant 2.0gls

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Jun 10, 2009 | 1999 Mitsubishi Galant

1 Answer

Heater problem

The blower motor resistor is faulty.

On high speed, battery voltage is directed right to the motor.
For any other speeds, battery voltage runs through the resistor pack (in any of 3-4 ways) to reduce voltage and slow the motor down.

The resistor is located (screwed in) inside the heater duct or box somewhere where cold air always contacts it (before the heater core) because it becomes hot and would melt if it wouldn't be constantly air cooled.

You can consult this link

for replacement of the resistor (the thread says Grand Am, but your Alero has the same setup)

Thanks for using FixYa!

Sep 02, 2008 | 2002 Oldsmobile Alero

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