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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 þ SLMR 2.1a þ Typo Tom strikes agaoin
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