electric cooling fans

67l60 · 02-28-2007, 07:01 PM

ok they dont work so i tested the relay low and high & they work

so i replaced the thermo switch on the rad and it worked for maybe 10 minutes then stopped tested relay again all is fine

so whats the odds of gettig a bad thernmo switch

the switch i purchased was a 84 deg 92 deg figured cooler is better
should i have gotten the 92 and 102 deg

nynor · 02-28-2007, 07:17 PM

did you check the fuse again?

i had this same problem on my '83, kid you not. i was pulling my hair out. then, i found that the motor on one of the fans was not quite bound up, it would turn but it was stiff. this was causing it to draw too many amps, which would sometimes cook the fuse and sometimes just cause it to build up some carbon and not work anymore. i spent HOURS on this problem. i ended up getting some lubricant into the fan motor and it freed up.

67l60 · 02-28-2007, 07:43 PM

thanks i check it all again tomorrow

if the fuse was bad , jumping the terminals 1&3 & 2& 3 the fans still wouldn't work would they ?? were mine are working when jumped high and low is fine

butt ill check it out its got me puzzled, butt not beat.

mattdavis11 · 02-28-2007, 08:40 PM

Is the water level correct?

67l60 · 02-28-2007, 08:54 PM

maybe too full , definitely not low . all air bled off ,at bleeder

didn't run hot till the fans quit working. about 12 miles

then i turned on the ac switch fans come back on and engine return to normal

mattdavis11 · 09:31 PM

I'm not well versed on the later cars, but it sound to me as if the temperture switch on the head might not be working right.

OTOH, I've bought a bad thermo fan switch (rad) that was no good out of the box. If you have to jumper the rad switch to cool it down, you know if rad/ fan switch is good/bad.

67l60 · 02-28-2007, 09:34 PM

thats the temp sender for the Gage
i replaced it first then i replaced the thermo switch
then i figured out how to test the relays and now I'm back to square one and only out about 35.00 so tomorrow is another day and ill continue with the issue thanks for the tips

67l60 · 03-01-2007, 01:48 PM

well things are looking up, the fans are working
they turn on at about the 3rd line and shut off at the first
does this sound right
and the factory alarm is functional i , hooked up the horn
loud little bugger, i think it needs a motion switch/shock switch
any one ever add this to a factory alarm if so details

BrianT · 03-01-2007, 07:55 PM

I had a problem with my fans, it turned out to be the relay socket, one of the connections to the right fan had pushed back. Due to it getting little connection it caused it to heat up and melted the socket. From the front it looked OK, I used a wire to cross it over and it worked fine. I found that the relay lead going to the coil of the relay was pushing back when I installed the relay and after getting a new relay and pluging it in I found the bad connector on the right fan, fixed t and working OK now. Mine would work sometimes and not others.

SoCal Driver · SoCal Driver's Garage

The socket construction between the early and later fuse/relay blocks are pretty much the same. There is a big difference in the relay and some of the logic used. I think www.clarks-garage.com may have a section on the later 944 cooling fan system.