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RE: [TR] 1980 TR7 heater fan

To: <lstein6@gmail.com>, <triumphs@autox.team.net>
Subject: RE: [TR] 1980 TR7 heater fan
From: "Randall" <tr3driver@ca.rr.com>
Date: Fri, 3 Nov 2006 18:27:42 -0800
> the heater fan does nothing.  i took the dash around it off 
> and measured the 
> switch.  there is one black input i assume to the switch for 
> ground, and 
> three green wires for each of the speeds.  i'm assuming as 
> you turn it on, 
> the fan motor get's more grounded.  that is all good.  then i 
> found the 
> green/grey wire on the fan motor.  i grounded it and still no 
> fan.  i could 
> not find any other wire on the fan motor.  can someone 
> suggest further 
> troubleshooting techniques?

The motor has to have power as well as ground ... where is the power coming
from ?

>  if the fan is dead, is there an impedence i can 
> measure.

Any motor winding will be a very low resistance, no more than an ohm or two
at most (and usually much less than that).  The winding is essentially just
a length of wire ...

>  it's a tight fit there, any suggestions for remove 
> / replace on 
> the fan?

What does the shop manual say ?

Randall



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