After Run relay

[jday1 <jday1@injersey.com>]

This post is for everyone who keeps personal archives of fixit tips from 
the list.

I have just completed this repair and so far it appears to work. The 
transistor is NPN silicon - TIP31. It indeed was 99cents at Radio Shack. 
I was only able to determine the value of the burnt resistor because my 
mechanic gave me a used, nonburnt relay. However now I have a spare and 
if someone needs to know the value of a particular component I'm willing 
to help out.
*******
This was sent to me:
I did fix a potentially expensive problem with $1.00 worth of parts. 
The turbo coolant pump wasn't operating.  Ohmed out the wiring, pump runs 
ok, 
must be the relay.  Opened the relay and sure enough, its expensive 
little 
guts are charred.  Managed to get a part number off the burnt transistor 
(SGS-Thomson BD435), got a data sheet off the Thomson web page, went to 
RShack
and found a comparable NPN transistor(TIF-31), soldered it in place along 
with
a new, beefier 1/2 watt 100 ohm resistor from the junk drawer, plugged it 
in, 
and WOW! it WORKS!  The relay is $105.00 from the dealer, $80.64 from 
Carlsen.
RShack transistor was 99 cents. 
********

I have the feeling that when the coolant pump goes the sensor keeps 
calling it thru the relay and the transistor and various other parts in 
the relay overheat and die. At 16 cents I replaced the resistor first. 
Didn't do it, new one charred. Replaced both components. Ran car with A/C 
on, after-run fan ran for less than 5 minutes after a 30 minute city 
drive. If your relay is charred, your after-run components go to default 
and the fan will run for 15 minutes after every little drive. Then you'll 
be replacing alternators and batteries as I did, following all those 
threads over which battery is best; alternator output, etc.etc. etc.

Not putting anyone down here. Often the only problem is my lack of 
knowledge and I truly apreciate everyone's help. I love my car but I 
probably be too pissed off over the repair costs to keep it, if it 
weren't for this list. 

87 5CSTQ - 115,000
A great car, a great hobby!
Son#1 - 82 Coupe
Son#2 - 90 20vQ