RW> TW> IT lowers the emmissions, In fact California requites a higher   
   RW> TW> engine temperture to LOWER the enissions   
      
   RW>Nobody cares what CA requires, except law abiding Californians. The rest   
   RW>of us use lower temperature thermostats in our cars. I used a 180 in my   
   RW>Z28 when I lived in CA. Some people I knew at the time also had altered   
   RW>their exhaust to eliminate oxygen sensors in the exhaust, in an attempt to   
   RW>increase fuel/air ratios. Some even removed the cats...   
      
   You made a statement "implying" that Higher Engine temperature Raises   
   Emissions. I mearly rebutted that statement saying it actualy LOWERS   
   it.   
      
   RW> RW>> If you have a better explanation, I'm all ears.   
      
   RW> TW> Well the Engine Block switch and the AC fan control are two seperate   
   RW> TW> circuits and should not interfere with each other.   
      
   RW>After consulting the factory Service Manual, I'm going to stick by my   
   RW>statement.   
      
   RW>/quote   
   RW>Engine Electric Coolant Fans   
   RW>  Coolant fan operation is crucial to the proper operation of the air   
   RW>conditioning system. The coolant fans ensure the proper amount of air flow   
   RW>acrosss the condenser throughout the vehicle operating range.   
      
   RW>  Fan operation should be checked during any air conditioning diagnosis   
   RW>procedure. Special attention should be given to the fan wheneve excessive   
   RW>high side pressures are encountered.   
   RW>/unquote   
      
   That quote has nothing to do with the Engine Block heat switch and the   
   operation of the Fan to pervent engine overheating.   
   IF your FAN was not responding the the engine block temperature switch   
   you had ANOTHER problem totally indepebndent to what the AC system was   
   reporting.   
      
   RW> TW> NOT being a Chevrolet Fan I got this from www.camaroz28.com on   
   RW> TW> coolant fan not runing if AC looses charge   
      
   RW> TW> ****   
      
   RW> TW> There are 7 things to consider:   
   RW> TW> (the first 4 are ruled out because you said that the fan worked when   
   RW> TW> the A/C was working.) Item 5; either the coolant temperature isn't   
   RW> TW> reaching 238øF, or faulty wiring to the relay. Item 6; ECM fan driver   
   RW> TW> may be bad. unforunately the ECM will need replacing. Using an   
   RW> TW> adjustable temp switch (for winter/summer) would save you the trouble   
   RW> TW> of buying a new ECM, but you'll lose the control the ECM has for   
   RW> TW> different conditions.   
      
   RW>Neither of these are what is happening. The coolant temp doesn't ever go   
   RW>to 238F in any case. Even if you have a factory 195F thermostat, it won't   
   RW>go that high. And, since the system works as it is supposed to work when   
   RW>it is charged, I don't believe for a minute that there is anything wrong   
   RW>with the system (other than a system leak).   
      
   RW>You cannot perform a fan operation check without certain diagnostic tools,   
   RW>as specified by GM.   
      
   Than why is it suggested you Ground the Wire GOING to the Block Fan   
   switch to see if the FAN would run?  WHICH it should, THEIR WORDS   
   NOT MINE!!!!   
   ---   
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