A/C not holding it's own

[abrussich]

Firstly, thanks for the info on the fuel pump. I will seek out the Bosch units locally and if un-obtainable I will contact SJS.
Another problem I need to address is the A/C system. During our warm months, (which in Houston is most of the year), the A/C unit will blow cool air for a short period of time then blow out warm air. If the car is allowed to sit for a short period the air will again blow cool for a period. I had the A/C charged and tightened the connections at the compressor. The system appears to be in working order. Any ideas?

[cnh1990]

If the evaporator core is dirty it may ice up and not let air throught the core. cooling is then restored when it defrosts a bit.
Calvin

[abrussich]

Will, or is the core capable of icing up when it's 100 deg. outside? If all is needed is a shot with a power sprayer I will be most overjoyed.

[lotusguy]

Hi,

It sounds like a faulty low-pressure switch to me. If this switch energizes it will cut out the compressor, which is it's function to protect the compressor should a loss of refrigerant/oil occur. Once the car sits, the switch de-energizes and your cooling returns. This switch is located just off the receiver/dryer inside the front boot.

Calvin's diagnosis is sound but I have had tons of experience with icing AC's in Hotels I've run in the south and it takes much more than a short stop to have it thaw out, usually several hours. Happy Motoring!...Jim'85TE

[incautious]

Also check the dash control switch, as this controls the cycle time for the compressor. You may just have dirty contacts or a bad switch