Climate Control Fan Speed
#1
Climate Control Fan Speed
My climate control fan speed doesn't work anymore for some weird reason, just stays at max... you can change the speed on the unit, but the fans still blow hard. I took it to the dealership, they said there is a resistor that is probably blown, 100 bucks for the part!! :eek: and an hour for labour (at most). Just letting people know incase they have a problem like that, or if anyone has had a simular problem if there are any alternatives. Thanks!
#2
Yep, 99% chance its a resistor. That was a big problem in E34 5 series BMW I have...part was $200 though
The obvious symptom will be it only blows on max speed the whole time and really doesnt blow at all on the other speeds.
I suppose you could try some soldering on the resistor, but I dont know what the Lexus SC one looks like.
The obvious symptom will be it only blows on max speed the whole time and really doesnt blow at all on the other speeds.
I suppose you could try some soldering on the resistor, but I dont know what the Lexus SC one looks like.
#4
Transistor
Lexus uses a power transistor to drive the blower motor at various speeds except full speed, then there is a relay that bypasses the transistor to supply full voltage.
Stuck relay contacts would be my guess.
Stuck relay contacts would be my guess.
#5
Re: Transistor
So are you saying that I might not even need the parts? Or might not even need to send it to the shop for that matter?
Originally posted by wwest
Lexus uses a power transistor to drive the blower motor at various speeds except full speed, then there is a relay that bypasses the transistor to supply full voltage.
Stuck relay contacts would be my guess.
Lexus uses a power transistor to drive the blower motor at various speeds except full speed, then there is a relay that bypasses the transistor to supply full voltage.
Stuck relay contacts would be my guess.
#6
NO...
Speaking for the 92 LS400 there is a power transister "module" mounted on the climate control housing near the blower itself. It's that transistor that supplies the power for the blower unless the ECU commands max speed and then it activates a relay to overcome even the minor level of voltage the transistor would still drop at saturation.
Find someone with shop manual for your car and have them tell you where the relay is located.
Find someone with shop manual for your car and have them tell you where the relay is located.
#7
Thanks for the replys, the dealership has ordered the part, says it goes somewhere int he glovebox? Does anyone have a manual, I might just want to do it myself, they say it will take them over an hour which is gonna be an extra 100 bucks, normally I wouldn't care but I am back in school and honestly I could use that money for springs and shocks . If anyone w/ a shop manual can help me out that would be greatly appreciated! Might help someone in the future as well.
Thanks
Thanks
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#9
I don't need a whole A/C unit, its just a 100 dollar part that is broken... I just was wondering if anyone w/ a manual could help me find where it goes by posting some schematics for the climate control unit. Thanks though.
#10
There are two electronic components controlling the fan speed (three actually if you include the A/C Control Unit), the Blower Resistor and Power Transistor, both located immediatly behind the glove box, I hope your dealer has diagnosed and ordered the correct unit.
#11
Well its not the resistor for sure, I am trying to test the power transistor but can not find it. Anyone have any ideas? I will post pictures of what it looks like w/ what I am looking at. It is driving me nuts now only having the fans at full speed. Thanks again everyone.
#12
I have never had to do this so I can only go by the Lexus manual,
it seems you have to remove the A/C Unit (the big part behind the glove box) to get at the transistor (it must be located inside the unit, in fact the diagram above would suggest this).
But the manual on A/C Unit removal says; "Remove Engine" surely not !!!!
it seems you have to remove the A/C Unit (the big part behind the glove box) to get at the transistor (it must be located inside the unit, in fact the diagram above would suggest this).
But the manual on A/C Unit removal says; "Remove Engine" surely not !!!!