| Author |
Message |
Pelle Thorsson (Pelle)
New member
Username: Pelle
Post Number: 4
Registered: 4-2002
| | Posted on Thursday, August 15, 2002 - 12:42 am: | |
Hello friends, I have same problem on my 88 TR
Is there any way to check if the switch is OK ?
There are 4 wires on my switch, red, green black and blue, can I measure it with an ohm meeter ?
I removed the reostat, it's a double reostat, when I measure this reostat the first one works like a normal reostat but the second is working like a like a switch, just on or off, should it be like that ? // Pelle |
Ben Lobenstein 90 TR (Benjet)
Member
Username: Benjet
Post Number: 525
Registered: 1-2001
| | Posted on Thursday, April 04, 2002 - 11:43 pm: | |
Adam -
Mine wasn't the switch either - it was the transisitor as well. But have seen failures of both, more common are the transistors IIRC. Again there is a hack where you do not need to remove the dash to replace the transistor. They are about $40-50 from your local F dealer and are basically a $2 part with some mounting and wiring added. I have a box of about a dozen transistors here that I picked up when mine failed (I think that cost me $20), if you want one I can send you one, but you'll need to mount and wire it up.
The main reason for this system has to do with not wanting to run the "full power" wires (and that blower is a heavy user) thru the cabin, they want to have "remote controls" for everything and they do. My sensor and A/C system works very well as intended (with cabin sensor).
-Ben
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Adam Goldman '86 TR (Icnsltmfg)
Member
Username: Icnsltmfg
Post Number: 299
Registered: 8-2001
| | Posted on Thursday, April 04, 2002 - 8:07 pm: | |
Thanks steve. I will check it out. Why do Italians feel they have to try and be German Engineers. The build pretty, and fast cars, but leave the high tech stuff to the Germans. I love that the TR has Auto temp control. Does that sensor on the dash actualy work?, and why the switch is not just a Potentiometer I will never know. |
Steve Magnusson (91tr)
Member
Username: 91tr
Post Number: 644
Registered: 1-2001
| | Posted on Thursday, April 04, 2002 - 4:56 pm: | |
Adam -- it's not that simple. When you put the TR fan speed control dial in the full "on" position this just closes a simple internal switch and runs the fan at +12V. At anything less than full on, the electronics in the fan switch (it's more than just a potentiometer) AND the power transistor on the AC unit itself are involved. I had a similar problem and decided to try a new fan switch since it was easier to replace than the power transistor (which requires a dash-ectomy) -- but my problem was actually in the power transistor. I would love to sell you my (now) extra fan switch (for a discount, of course -- any takers?), but unfortunately, they made several changes to the fan switch over the years (mine is the last type with 4 wires at the connector -- not 5 if I recall correctly) so I think yours is different (but let me know your SN and I can check the SPC). Anyway, I just wanted to warn you that the power transistor on the AC unit is also involved in the variable fan speed operation. |
Adam Goldman '86 TR (Icnsltmfg)
Member
Username: Icnsltmfg
Post Number: 296
Registered: 8-2001
| | Posted on Thursday, April 04, 2002 - 3:16 pm: | |
Has anyone tried to either rebuild this switch or replace it with a standard Potentiometer as I assume thats all it it. At $400 is is quite costly. Mine seams to be on it's last leg as it is either full on or off when turned 100% clockwise. |
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