Question about 1994 BMW 3 Series

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Fuse on a/c blower always hot when the blower is high stage or Full

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Bad connection or bad ground for fan or fan going bad or blocked air flow for fan causing high rev on fan

Posted on May 09, 2014

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Posted on Jan 02, 2017

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2 Answers

2006 I-280. Why does A/C blow cold air only on high speed?


check fuse first
then scan PCM , oops you didnt and the BCM does run this stuff.
so not scanning it , you miss all those FACTS.

the blower is dead. (aka , not spinning , or silent)
on all cars made the answer is the same.
blown fuse, fuse marked BLower, is blown. LOL.
controls not turning it on, controls failure.
blower bad. (motor) hot wire it in place to test)
wires to any of the above.
or the resistor block bad, (if it works on high but not low)
i have the schmematic in hand.

the HVAC relay pulls in by command of the BCM
the relay then sends 12vdc power to the blower via fuse 41
the blower is now hot full time.
the blower then needs a ground to spin (run)
on high, the ground G601 via the speed knob,switch makes that ground connection, so if the fan dont spin and say the fan is ok
then the relay is not closing or the fuse 41 is blown. (why not look at the fuse first for all electric fails)
the BCM sees you, turn fan on, (heat or cold)
and closes this relay, on the left.
if the relay does not close, (and coil is ok inside)
the the BCM didnt see those HVAC requests.
use a scan tool and look for BCM errors..>??????


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Oct 23, 2015 | Isuzu Cars & Trucks

2 Answers

How do I find the fuse for the heater blower


IF the heater fan is not working it is most likely the heater fan motor that has failed.

Oct 08, 2015 | 2001 Suzuki Grand Vitara

2 Answers

96 geo heater blower does not work


Replace the blower motor. The brushes wear out. Any autoparts store has them. About 100 dollars

Oct 04, 2015 | 1996 Geo Metro

1 Answer

Blower motor always high front and rear


look in the fuse panel there is a fuse for blower high and blower low check the one for blower low the location is on the inside of the fuse box lid

Mar 27, 2013 | Cars & Trucks

1 Answer

Ac compressor comes on but fan doesnt blow


I would check the fuse to the blower motor, if thats good then check power at your blower connector. In some cases the final stage may have gone out. Generally that would cause the blower to move on its own from low to high and back to low, in worse cases its either on full blast or off in your case. Good luck and let us know what you found!

Feb 12, 2013 | 2001 BMW 325

1 Answer

Fuse of blower gets hot


Fan Motor drawing to many amps. .

Jun 10, 2010 | 2008 Mitsubishi Lancer

1 Answer

2000 Volvo V70 climate control problem - blower remains in high, regardless of AUT 0-High setting. Vent selection and temperature controls work. Any idea?


Most common cause of this problem is a bad climate control power stage. The power stage control the speed of the blower fan on different settings, if it goes bad it defaults to full blast. There is a small chance the climate contro lunit itself is bad but more than 90% of the time, it is the power stage. It is located near the blower fan under the dash in the passenger footwell area. It makes it much easier to remove the glove box and knee bolster as well as the cover panel. It is rectangular in shape about 1.5" x 3" and black.

Nov 01, 2009 | 1999 Volvo V70

1 Answer

Chevy silverado 1500 2003. For several months the fan has only worked on "5". Today, even when off it only blows high. I had to pull the fuse for the blower. Any ideas?


The blower resistor needs to be replaced, that is why your only have the highest setting working since the blower speed resistor's are being by past. The other thing that happened is since the blower is always on high, the high current most likely burnt out the blower relay and ir stuck in the close loop and needs to be replaced. pay attention to the wire harness, since it got hot enough to damage the relay, it may have damaged the wire harness to and fire may start due to a short. Good luck and hope this helps.

Jul 11, 2009 | 2003 Chevrolet Silverado 1500

2 Answers

Heater blower not working


It sounds like your cabin air filter has stopped up common problem on these cars. You have to remove the glovebox to get to it. If this filter stops up, your fan will be running on high but hardly anything will come out of the vents.

May 31, 2009 | 2001 BMW 325

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