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Icing up

jaym on Sat June 27, 2009 10:37 PM User is offline

Year: 2005
Make: Saturn
Model: VUE
Engine Size: 4 Cyl
Refrigerant Type: 134a
Ambient Temp: >85F
Pressure Low: Not done
Pressure High: Not done
Country of Origin: United States

My Saturn VUE's evaporator core freezes-up when I take a trip for more than 2-3 hours. I turn the AC off and let it defrost and it works fine for about a half hour or so, then it ices again. It's been in the shop two times, once under warranty. The system was evacuated and recharged with the correct amount of 134a the first time and they found no problem with it the second time. The problem remains.

Does this commonly occur with this vehicle? Any corrective measures anyone can recommend to resolve problem?

Thanks for any help.

94RX-7 on Sat June 27, 2009 11:02 PM User is offline

I'm not familiar with this particular vehicle but I would suspect that you've got a bad temperature sensor/switch on the evaporator.

bohica2xo on Sun June 28, 2009 3:06 AM User is offline

The evaporator temperature sensor on that vehicle is in the engine compartment, bolted to the side of the TXV H-block.

The sensor is thermally coupled to the valve with a special grease. A new sensor will come with the special grease in the box. Usually just adding grease under the old sensor solves the problem, some were shortchanged at the factory. If you do replace the sensor, make sure the sensor well on the TXV is full of the supplied grease.

Sounds like your particular dealer is staffed with bozos. This is the first place they should have looked, instead of a charge R&R. That or they replaced the sensor & threw the grease in the trash...

One screw, very near the suction line. A small two wire sensor.


"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

jaym on Sun June 28, 2009 3:49 PM User is offline

Outstanding! Thanks 'bo-2'.

Since cooling occurs for several hours with no probems, I am leaning toward a properly operating TXV; so, I will try removing the sensor and replacing the grease. What type grease is it, and can it be purchased locally? Thanks again.

Greatly appreciate the quick and thoughful response.

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