On Mar 21, 11:27 pm, Ashton Crusher wrote:
> On 21 Mar 2007 18:04:43 -0700, "Art" wrote:
>
> >I have a 95 Camry with a sick air conditioner. Blows cold for a while
> >and then warm.
> >The low side pumps down to a hard vacuum. The high side is at 90psi.
> >The receiver outlet is not cold, so I don't think it's blocked.
>
> >All that's left is the expansion valve, I think.
>
> >Seems like a strange failure mode--is this typical?
>
> >TIA, Art
>
> Are you sure this thing even uses an expansion valve. Seems like most
> stuff these days uses an orifice tube with low pressure cycling for
> temp control. What you describe sometimes happens with low freon
> charge because it lets the evap coil freeze up and the air starts to
> feel warmer. It's also possible that the system is computer
> controlled and the computer is messing up.
Yep, it's got an expansion valve. It looks like an oblong block with a
diaphram on the end--no thermal probe. Nope, it's not computer
controlled.
I didn't think of the evap coil freezing up and I'm not clear how a
low charge would cause that. Can you expand on that idea?
Tks, Art
|