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97 GC 3.8L Radiator Fans not working

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Old Feb 17, 2011 | 11:43 AM
  #11  
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Tizzy1
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yep, somewhere in that range.
 
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Old Feb 20, 2011 | 07:30 PM
  #12  
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Talking beware the fan relays

Well, I think I'm all fixed now. I last reported that I have now replaced both valve cores and fixed the AC leaks. The high side core assy needs a special socket but I made it work with some .010 shims inside a 16mm socket.

Prior to that I had filled the AC so I set out to test the transducer switch by hooking up my AC pressure gages to see when the rad fans came on at what PSI. I put in the OEM relay and the fans would come on at 2.0 volts (220 deg) or if pressure got to 250. Then it stopped coming on and volts got down to 1.7 - very hot. I then did a quick swap to relay #2 and fans came on. I have determined the the OEM relay is junk after it heats up for awhile. I needed to run this for quite some time to find that out. The fans were consistent after that. I think I'm ok with the transducer - no need to change. After vacuum down and recharge with 46 oz I had fans coming on above 200 psi and also around 2.5v (180 deg). I can see that there is a variable to determine fan operation and its not just cut and dried. I think that relays can be suspect even if they appear to be good at first and I also think that my PCM purchase may have also been needed as the current relay would not come on under the same previous conditions.

AC is at 250/25# at 70 deg ambient and 46 in center vent - all fixed! Keepin my fingers crossed. I then broke the LH door regulator - whats next >>>> ha ha
 
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