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Radiator Fan 200tq problem solved
Well, the 200 tq started overheating for the second time in a week.
Luckily, we were just arriving at Lisa's job interview so she wasn't
late. No tools, no VOM. No Bentley. Bad. Never travel without that
stuff. Trust me on this. I could hear the nice shiny new after run pump
gurgling, but there was no radiator fan operation. I swapped the #2
relay with the #3 relay and still no rad fan. I went across the street
and got some distilled water. Drove home without the AC on and the temps
stayed low as long as I didn't draft the car ahead of me. Tried the
climate control on heat and it wouldn't heat. Presumeably because it was
already about 95 degrees F out.
Got home and broke out the multimeter. The fusible link tested good.
Hmmm.... Turn on AC and the rad fan now works. WTF? Turn it off and on
again. Now doesn't work. Scratch head, measure voltage from fan to
ground. 12V. Measure voltage across fusible link. 12V. Wait a minute.
Fusible link has a hairline crack in it. I think it failed, not from
overcurrent, but from repeated heating and cooling which stressed the
metal.
HTH someone,
Wolff
P.S. Is the low speed resistor pack mounted below and in front of the
radiator, sort of on the crush zone?