TOM WALKER wrote to ROY WITT:

 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
 RW>> rest of us use lower temperature thermostats in our cars. I used a
 RW>> 180 in my Z28 when I lived in CA. Some people I knew at the time
 RW>> also had altered their exhaust to eliminate oxygen sensors in the
 RW>> exhaust, in an attempt to increase fuel/air ratios. Some even
 RW>> removed the cats...

 TW> You made a statement "implying" that Higher Engine temperature Raises
 TW> Emissions. I mearly rebutted that statement saying it actualy LOWERS
 TW> it.

I didn't say any such thing. Not to mention that all of those guys who
have 180 thermostats in their cars and have removed the Cats still pass
emissions tests, IN CALIFORNIA...if the test stations even thought that a
Cat was removed, the cars wouldn't pass the visual check.

 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
 RW> TW>> seperate circuits and should not interfere with each other.

 RW>> After consulting the factory Service Manual, I'm going to stick by
 RW>> my 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
 RW>> air flow acrosss the condenser throughout the vehicle operating
 RW>> range.

 RW>>  Fan operation should be checked during any air conditioning
 RW>> diagnosis procedure. Special attention should be given to the fan
 RW>> wheneve excessive high side pressures are encountered. /unquote

 TW> That quote has nothing to do with the Engine Block heat switch and
 TW> the operation of the Fan to pervent engine overheating.

On the contrary...

 TW> IF your FAN was not responding the the engine block temperature
 TW> switch you had ANOTHER problem totally indepebndent to what the AC
 TW> system was reporting.

Wrong.

 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
 RW> TW>> when the A/C was working.) Item 5; either the coolant
 RW> TW>> temperature isn't reaching 238øF, or faulty wiring to the relay.
 RW> TW>> Item 6; ECM fan driver may be bad. unforunately the ECM will
 RW> TW>> need replacing. Using an adjustable temp switch (for
 RW> TW>> winter/summer) would save you the trouble of buying a new ECM,
 RW> TW>> but you'll lose the control the ECM has for different
 RW> TW>> conditions.

 RW>> Neither of these are what is happening. The coolant temp doesn't
 RW>> ever go to 238F in any case. Even if you have a factory 195F
 RW>> thermostat, it won't go that high. And, since the system works as it
 RW>> is supposed to work when it is charged, I don't believe for a minute
 RW>> that there is anything wrong with the system (other than a system
 RW>> leak).

 RW>> You cannot perform a fan operation check without certain diagnostic
 RW>> tools, as specified by GM.

 TW> Than why is it suggested you Ground the Wire GOING to the Block Fan
 TW> switch to see if the FAN would run?

You must be using older, before OBD I, information.

 TW> WHICH it should, THEIR WORDS NOT MINE!!!!

I'll use the 1998 Service Manual to diagnose and repair what their testing
reveals...it specifically applies to the 1998 product rather than some
generic unknown source.


         R\%/itt


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 * Origin: Texas Lone-Star - Texan, American, USAian  (1:387/22)