About 1 yr ago, the medium-high setting on my heater went out. No big deal, cause the other settings still worked. Now, when I turn on the heater, I only get very little heat on the highest settings, yet I hear the blower/sensor (behind the glove box) click as I switch control from Low-Med-High. Is this the blower that isnt working?
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The lower speeds you likely have a bad resistor block. Pretty cheap part. High on blower motors usually has a relay under the hood. Just so you know, people can give better help if you always include yr, make, model, engine size etc. The more info about the car, the better
blower is not running full speed? on high?
the blower has this resistor block on many cars,
that fail, easy. (burn up) but not ever on high. (bypassed then)
a big clue that. no?
is the blower slow or just dampers closed and cant feel it.
surly you know the sound of your blower on high, sound !
air flow is a whole other more complex matter.
also is battery rested voltage at 12.6v? if not you have discharged battery making fan weak ( power = volts times current. so....)
A couple of possibilities; air path blocked by debris (mouse nest, etc.), the sleeve-type phosphor-bronze fan bearings are clogged with wear particles, less likely but still possible is a failing blower switch, failing ground for the fan motor or an oxidized fuse or fuse holder.
A multimeter would be handy to isolate the source of the problem.
With your headlights on and shining on a vertical flat surface, try noticing if they dim very briefly when you quickly turn the blower on.
If not, then the fan isn't getting full current, if they do, then this would indicate a bearing problem with the fan.
Late model Cadillac Deville's and Seville's may experience a humming noise in the passenger compartment when the heater is on high and the blower is set on a medium to high speed.
GM has determined that the most likely cause of the humming noise is from the positioning of the blower motor within the HVAC housing, causing a restriction of the incoming airflow. (GM TSB 03-01-37-001)
The recommended repair for this symptom is to reposition the blower motor.
1. Remove the right side sound insulator. 2. Loosen the three blower motor retainer bolts. (Do not remove bolts) 3. Shift motor as far as allowed toward the vent tube. 4. Re-tighten the retainer bolts. 5. Re-install right side sound insulator.
All cars are designed with a blower fan motor that pushes air through the ventilation system. This air is processed by a series of vents to direct the air to various positions. Example: heater, air conditioner and defrost modes. Most blower motors are power by a basic electrical circuit that utilizes a multi resistor or a solid-state resistor to control different fan speed modes (low, medium low, medium and high). If the resistor malfunctions it may lose one or more of the lower fan speed settings.
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It's likely a relay. I've often seen where the lower settings are ran through one relay and the higher setting ran through another because of the difference in amperage. I'd start there, the relays are often pretty cheap and a lot easier to replace than tearing the dash apart to change the switch.