The fan (blower) motor on my wife's 2005 Tacoma is only operating in the high position. The air-conditioning will work when the fan is "on" in one of the lower positions but the fan will not blow cold air unless the fan setting is in the highest position. The same is true of the heater settings. A few weeks ago I had my infamous "mouse problem". What really brought the "mouse problem" to our attention was that when the blower was on high, my wife smelled "something burning". I had the blower cleaned out and the air-conditioning serviced.
I'm pretty sure that the mouse nest caused this problem or perhaps when the tech was cleaning up the mess he might have neglected to connect something.
Any suggestions? I'll be headed back to the dealer but would like some idea of what could be wrong.
i think the motor uses different windings for speed
could be just a loose connector, or maybe the mouse took a wizz and corroded connector that could use some cleaning, or managed to chew through wiring
A new twist. My wife informed me that the blower is now working at all speeds, not just high.
I called my dealer's service department and explained the whole situation. The service manager that I talked to said that because it is working again, it sounds like a short in the wiring. OK, if it is a short in the wiring, why would the blower operate on high but not the other speeds? Is the high speed operation on an entirely separate wire. Does the resistor problem ever correct itself?
We'll be taking the truck out of town in a couple of days and I don't have time to get it back to the dealer. We are headed north and I for sure want the fan to be operating. If problem is the resistor which I think it is, will it continue to operate on "high" indefinitely or at least until I can get the truck in to have it checked out.
A new twist. My wife informed me that the blower is now working at all speeds, not just high.
I called my dealer's service department and explained the whole situation. The service manager that I talked to said that because it is working again, it sounds like a short in the wiring. OK, if it is a short in the wiring, why would the blower operate on high but not the other speeds? Is the high speed operation on an entirely separate wire. Does the resistor problem ever correct itself?
We'll be taking the truck out of town in a couple of days and I don't have time to get it back to the dealer. We are headed north and I for sure want the fan to be operating. If problem is the resistor which I think it is, will it continue to operate on "high" indefinitely or at least until I can get the truck in to have it checked out.
Thanks for any suggestions.
Tom
First of all from what I've read, the High fan speed doesn't go through the resistor. No need to slow the fan down at this speed thus no need for the resistor. In which case, it shouldn't go out on you.
Second, if you followed some of the links that were in my link, you would have been led here: HVAC blower motor resistor replacement - Toyota Forums :: Toyota Nation
The person that did the write-up on replacing the resistor mentioned that his symptoms were first intermittent. Later the low and medium speeds went out completely. Sounds like you're at the intermittent stage.
So, read this writeup and get yourself the part. Easy to do yourself at $28-$38! The pictures in this writeup are well documented.
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'05 4x4 DC LB SR5 Tow Pkg BFG All-Terrain T/A KO, Leer Tonneau, Westin Platinum Nerf Bars, Fog and Map Light Mods, Orig. Owner 12/3/04
Replace the blower motor resistor.
Max fan speed is usually relay controlled while all other fan speeds electrically route thru a resistor pack, so yes, there are 2 separate circuits operating the same component (heater-a/c fan motor).
Most electrical components are capable of failing intermittently, but a failure is a failure regardless of frequency, & failed components should be replaced.
Thanks for the information. I'll get the replacement done ASAP. The blower resistor seems to be a frequent problem. So this should be the first step rather than tearing into other areas where there is wiring that the mouse could have chewed into?
I'll get the replacement done ASAP. Thanks for the information. The blower resistor seems to be a frequent problem. So this should be the first step rather than tearing into other areas where there is wiring that the mouse could have chewed into?
Tom
Likely it was just coincidence. Either replace the resistor pack now or wait until it quits for good.
__________________
"Think Outside the Box!"
'05 4x4 DC LB SR5 Tow Pkg BFG All-Terrain T/A KO, Leer Tonneau, Westin Platinum Nerf Bars, Fog and Map Light Mods, Orig. Owner 12/3/04
If it is the resistor -- which it probably is -- I'll still have the high speed fan after the resistor "poops out", right? Minnesota is a heck of place to be without a defroster this time of year.
should ! hi speed depends on just switch contacts to get 12 volts
While it is correct that the Hi (max) speed setting will continue to function with a faulty resistor pack, the 'max' setting supply voltage does not run thru the switch.
Most blower motor full speed amperage draws are too high to run directly thru a switch safely & therefor are routed thru a relay, with the switch hi-fan position simply activating the relay.
No offense intended here, just didn't want folks to misunderstand how it works.
While it is correct that the Hi (max) speed setting will continue to function with a faulty resistor pack, the 'max' setting supply voltage does not run thru the switch.
Most blower motor full speed amperage draws are too high to run directly thru a switch safely & therefor are routed thru a relay, with the switch hi-fan position simply activating the relay.
No offense intended here, just didn't want folks to misunderstand how it works.
You are partly correct here. The supply side of the blower motor is always switched via a relay no matter what the speed setting is. The return or ground side of the blower motor is either switched through a resistor or combination of resistors for the three lowest speeds, but it is switched directly for the highest speed.
You are partly correct here. The supply side of the blower motor is always switched via a relay no matter what the speed setting is. The return or ground side of the blower motor is either switched through a resistor or combination of resistors for the three lowest speeds, but it is switched directly for the highest speed.
Yes, you are correct. My mistake (I had my mind on cooling fan relays for some reason)
Most heater fan circuits works like this;
the fuse supplies battery voltage to the heater-a/c fan relay, the relay provides voltage to the fan motor directly after a 'mode' is selected (ie-vent position). The fan switch then directs the voltage ground for the fan motor thru the resistor pack (or module) in all positions except "off' (ground circuit open) & the 'max/high' position, which is run directly to ground (via the switch).
Sorry for the confusion.
Don't know if anyone is still monitoring this thread, I'm having a similar problem (a 2005 Tacoma 2.7L):
My HVAC blower does not blow air on any speed setting though.
I pulled the blower motor and applied 12v directly to the terminals on the
blower motor and it spun up fine. Then I put a voltmeter on the plug itself. It is giving me 12v reading on all speed settings other than off. Thinking this is odd, I put a test bulb on the plug to see if it would light up, and it didn't.
This is telling me that I'm getting voltage to the blower, but no amperage. I checked the fuses for a partially blown (all the 10 amp & 15 amp looked okay to me) but the owners manual doesn't tell me for certain which one controls the blower. However, I'm not having any other electric issues, and in fact when I turn on the A/C the compressor is kicking in even though the blower isn't.
In some respects this sounds like the resistor problem, but in the posts here everyone has said that the blower should work on the highest speed setting, even if the resistor has gone bad. My blower does not work at any speed setting. Could this still be a resistor problem? There was also some mention of a relay - Could I still get 12v on the plug even if the relay is not tripping? If yes, where the heck is the relay for the blower?
Tacoma blower motor problem.
Linear Mode
