mikey1

my heater/fan/blower motor all of a sudden died, does not work at all on any fan setting,

tested #12 40 amp fuse under the hood (heater motor)
tested #14 10 amp fuse under dash

both these test good,
where do i go from here?

should i try hooking the fan up directly to the battery?

ezone

Beat on the bottom of the blower motor...no change?
Blower power transistor? The usual culprit.
Craig will say to watch the fan blade when you turn it on, see if it barely turns. (I still haven't checked this on a bad one)

Get out your $3 test light.....

Test for power and ground at the blower motor. If you have power on both sides of the motor then it's missing the ground, which should be supplied by the transistor. There's more checks you can do from there, but at that point I just plug in another because I have test units and its quicker.

mikey1

yeah thats what i was thinking,

i guess i will pull it and test it out

CraigW

iTrader: (1)

Try inspecting the fan blades to watch for slight/brief movement when key 1st turned to II, with then fan switch set to on.

If it does move..... then the TCO on transistor is open.

mikey1

thanks,

when i get a chance to look at it next i think i am going to jump the pins in the transistor to bypass it and make sure the blower works first, if i jump pins 2 and 4 on that connector i think the blower should run when i turn the key on

mikey1

thanks all,

shorted pins 2 and 4 on the transistor connector, turned the key on and the blower ran perfectly fine, so that was an obvious indication the problem is the transistor, i will replace it

CraigW

iTrader: (1)

Make sure you have it mounted into place before testing.

mikey1

yeah i will,

for now i have done a "poor mans fix" because i had the parts on hand, i have temporarily run two wires from the 4 pin connector out to the shifter area and hooked the wires up to a toggle switch,

this at least lets me turn the blower on and off (highest speed only),

doesn't look so great but will get me by till i get a chance to get the part, can't really drive too well here right now without the defroster going,

CraigW

iTrader: (1)

If the TCO IS open, you could grab one pretty cheap and repair your transistor.

ezone

^ I have test units with a regular car fuse jumpered in place of the open TCO.

mikey1

any pics of this?

i thought about soldering a resistor between the 2 posts?

ezone

The TCO is a fuse, not a resistor.
IDK if a resistor would make it work, and what value resistor are you thinking you would use?

I just soldered a couple lengths of wire to the TCO terminals and connected a regular ATO fuse to those (spade terminals crimped on the wires), like a 10 amp or something handy. Fuse is hanging out the side of the assembly.
I only use it for testing though, I'm not running the fan full time with it that way.

For that matter, you could just jump the TCO with a plain wire for testing. Paper clip.

mikey1

thinking 1ohm.....i saw this.....

http://honda-tech.com/forums/honda-c...istor-2041582/

ezone

This is now a test unit: