[DeTomaso] Late Model Pantera A/C experts?

[Thomas Tornblom]

The thermostat only controls the compressor clutch, no vacuum doors or  
flaps. The sound you hear is when the compressor starts and stops. If  
the compressor doesn't cycle and it has a problem keeping the temp low  
it sounds like you might be low on refrigerant.

Have you replaced the low pressure cut off switch?

My system dumped the charge in the cabin on our 2006 trip when there  
was an excessive pressure and in the post mortem we found out that  
there is no high pressure cut off. I replaced the switch with a high  
and low cut off switch.

I have now replaced the leaking compressor and hope that I'll finally  
have a reliable, non-leaking system.

Cheers,
Thomas



20 aug 2009 kl. 20.47 skrev Charles McCall <charlesmccall at gmail.com>:

> Hi all,
>
>
>
> We've just returned from spending a week driving the Pantera around  
> NW Spain
> and Portugal.. Had a nice visit with the other known Pantera owner  
> in Spain,
> Fernando Bianchi. Saw his Pantera which is finishing a complete,  
> ground up
> restoration and group 4 conversion..
>
>
>
> Car ran perfectly the whole week. Burned lots of gas ;-) But I noticed
> something weird with the A/C while driving around in the blazing heat
> yesterday and returning home today.
>
>
>
> Late model Panteras have a vacuum operated system - a series of  
> doors that
> open and close to direct air to where you'd like it that use vacuum  
> instead
> of mechanical connections. The A/C compressor cycles on and off to  
> maitain
> the desired temperature, and each time the compressor cycles on or  
> off, the
> "fan" light in the speedo lights or turns off and there is an  
> accompanying
> "whoosh" of air, sort of like a truck's airbrakes, but mini-scale.
>
>
>
> Anyway, starting yesterday, I could hear the whoosh when the cabin  
> reached
> the desired temperature, but it would appear that whatever the air  
> is trying
> to move must be stuck. the whoosh repeats, and repeats, and repeats,  
> trying
> to move whatever it needs to move but without success. the  
> compressor stays
> connected and will never cycle off. If I manually roll the temperature
> selector to basically "off", there is a whoosh and the compressor  
> shuts off.
>
>
>
>
> I deduce that the thermostat is working and trying to send a signal to
> whatever air device shuts off the cooling function but it sticks.  
> But I can
> shut it off manually if I turn the temperature wheel to minimum.
>
>
>
> a)       Anyone know how the thermostat functions in the late model
> Panteras? What happens when the desired interior temperature is  
> reached?
>
> b)       Will it hurt anything if the compressor runs non-stop  
> continuously?
> For hours at a time? Is there something that could freeze, or  
> overheat, or
> something bad?
>
>
>
> Horrible description of the problem but hopefully people who have  
> seen the
> system will  understand what I'm trying to describe?
>
>
>
>
>
>
>
> Charles McCall
>
> 1985 DeTomaso Pantera GT5-S #9375
>
> "Raising Pantera Awareness Across Europe"
>
> <http://www.poca.com/index.php/gallery/?g2_itemId=2323>
> http://www.poca.com/index.php/gallery/?g2_itemId=2323
>
>
>
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