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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

'94 Nissan Sentra, 10 minute A/C

Q: I just had the condenser replaced in my '94 Nissan Sentra. The car cools fine for about 10 minutes, then commences to blow warm air. After turning off the A/C switch for about 30 seconds and then back on, the car cools fine for another 10 minutes or so. The local tech says it is a bad thermal expansion valve. I am not sure to believe him, and don't want to waste any money. Is the thermal expansion valve a possible cause? Or should I be looking somewhere else for the problem?

- Tony S.

A: Yes the expansion valve could be the cause. But, there could be an internal moisture problem as well. The expansion valve controls the flow of refrigerant through the evaporator. The evaporator is the part of the A/C system that provides/makes the cold air. If the expansion valve sticks in the closed position it will not let enough refrigerant through which equals no cooling. This valve can also stick in the open position which floods the evaporator and little to no cooling occurs. Then there's that moisture thing. Moisture inside the A/C system will cause ice to form. Guess where that ice forms? At the expansion valve. The only way to remove the moisture is to apply a vacuum to the system for hours in temps preferably above 70 degrees and to replace the receiver drier. The receiver drier has an absorbent in it to remove moisture. Yes your tech could be right and he could be wrong. That's the fun part of cars.

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