Question about 1998 Toyota Avalon
The HVAC blower does not run or runs is running at very low speed. When I change the fan speed buttons there is no difference in fan output. I am not sure if this is the fan motor or something to do with the automatic temperature control or the fan speed buttons. Any thoughts? Please advise.
After two summers of sweating under the sun, it's fixed!!! There were two wires which looked like ground wires right above the glove box. One of the two wires was almost totally severed due to an overstuffed glove box. I guess every time I open and close the glove box, paperwork in the glove box push the wire up and down. It's like bending the wire back and fourth. Over time the 2-3 mm thick wires slowly sever. Upon inspection, my wires only had 3 strands holding it together which explains the fan staying on the low position due to slow ground. I re-attached the wires and soldered them back into place. Now my AC works like new - thanks to Mathew the Mechanic.. Thank you for asking. I really hope this posting helps someone with the same unique problem.
Posted on Aug 23, 2008
SOURCE: Heater Blower Motor
Remove the glovebox door, and the under dash cover/trim panel.
Look behind where the glove box was, you will see the heater box
At the bottom of this box, there is a round plate with a wiring connector and 3 screws holding this plate to the heater box.
This plate is the bottom of the heater fan assembly; remove the connector, and the 3 screws. The fan motor will drop staright down. Real easy to do.
Posted on Oct 21, 2008
This is the first time I have heard of this problem. It's not to say it's not common. Try the salvage yard first obviously cause its cheaper. If problem presists contact the dealer for advice.
Posted on Jan 27, 2009
it will be hard to diagnose with out having my hands on it but try this.
this vehicle is known for blower motor resistor failure.
under the dash on the passenger side next to the blower motor there is a resistor attatched to the blower motor case it will have a single plug with 5 or 6 wires in it, they are normally within a couple of inches of the blower motor, remove this resistor and look at closely for any signs of burning this is a common problem, you can buy one at any parts house, do not operate the motor with the resistor removed from its mounting hole or you will damage it.
if the resistor looks good than purchase you a test light and drop me a line and i will explain how to test the entire system its not hard to do.
Posted on Jun 14, 2009
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Fig. Typical HVAC operation schematic
An inoperative blower motor could be caused by the following:
* Blown fuse(s). The fuse should be replaced. There may be both a LOW BLOWER and HIGH BLOWER fuse. Some models may also call it the HVAC fuse. Even the RADIO fuse is used in some applications. Check them all. If a fuse is blown there may be a short to ground in one of the power supply circuits.
* Open Circuit. Check the circuit between the ignition switch and the blower motor, and the blower motor ground circuit. Repair as necessary. * Faulty blower switch. A faulty blower switch should be replaced. * Most heater blower circuits also include a blower motor relay (look in the underdash convenience center), as well as a blow motor resistor. These items should be checked especially if the blower runs in one or two speeds, but not all speeds selected.
REMOVAL & INSTALLATION
Fig. Blower motor and fan assembly removal
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