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Re: Type 44 AC query
On Mon, 6 Sep 1999, David Head wrote:
> The problem seems to be either low charge or the restrictor/orifice tube. I
> was misreading the segments in the diagnostics last night. The low pressure
> cutout is cycling the compressor - about every 20 seconds. The heater core is
OK, that makes sense. To check this without evacuating the system, you
can place thermocouples on the refrigerant pipes going into and out of
the evaporator. The outlet temperature should be around 30 - 40 degrees,
and the inlet temp should be a couple degrees higher. If I remember
correctly, the type 44 has a thermal expansion valve (TXV) so the inlet
an doutlet will be veyr close in temperature, but still, the outlet
should be slightly colder. If it is warmer, then you need more freon.
As you add freon, there will be a point where the outlet temp will be
colder thna the inlet. This is the "critical charge." Typically, we add
an extra 1/2 pound above that.
Graydon D. Stuckey
'91 V8 Quattro 5-speed '86 Mazda RX7 TII+2
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