Can 20 year compressor overheat the 20V?

[laraa at sympatico.ca]

That's what I think. Marginal cooling, so any supplemental load will
overheat the system. 

Air conditioning can't add that much heat under the hood as to have an
engine overheat. A/C is a simple system : the cooling inside the car roughly
equals the heat generated outside in the engine bay. So if a lot of heat is
produced outside, there must be a freezing cold blast inside the car... 

You probably think of a bad compressor that adds too much drag on the
engine, causing it to overheat. I can't see how that could happen. A bad
compressor would destroy itself in a matter of minutes if it was dragging
that much. 

Your problem lies elsewhere. 

Did you removed the auxiliary radiator ? If so, did you connect the two
hoses together instead of blocking them ? 

Also, if there is one on your car, maybe you have a problem with the hot
water valve that is shutting the wrong hose when A/C is on. 

Maybe it's the A/C automatic head unit that is at fault. 

Last thing, the gauge. Are you sure the car really overheats ? Or is it only
an electrical charge on the temperature gauge/sender that makes it read
higher. Good to know before replacing expensive parts... 

Good luck,

Louis-Alain


-----Message d'origine-----] De la part de John Lagnese


Maybe the radiator is tired, maybe a flush of the cooling system may help.


-----Original Message-----

Yes, turning the AC on turns on the fan right away.


------ Original Message ------
> ------------------------------
> 
> Message: 6
> 
> Is the HVAC system firing up the radiator fan as soon as you turn it
on?
> 
> On 7/28/2012 3:56 PM, wadd-wadd at usa.net wrote:
> > The car is a '91 CQ with a working, original AC compressor. The car
has a
new
> > radiator and properly operating cooling system (senors, fan, etc).
> >
> > With AC off, the coolant temp is about the bold line, 90-100
degrees, even
if
> > it's 100 degrees outside.
> >
> > With AC operating, the car overheats if it's more than about 80
degrees
> > outside.
> >
> > I am having difficulty troubleshooting this. The cooling system is
otherwise
> > brand new and operates normally.
> >
> > Can it be the old compressor?
> >
> > What're your thoughts?
> >
> > Thanks.
> >


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