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V5 w/ Evaporator freezing??

steve325is on Thu July 24, 2008 12:39 PM User is offline

Year: 2004
Make: Chevy
Model: Optra
Engine Size: 2.0
Refrigerant Type: 134
Ambient Temp: 80F
Pressure Low: unk
Pressure High: unk
Country of Origin: India

This is more of a "curiosity" question than anything, but have any of you seen V5s with sticking control valves that cause the evaporator to freeze? I have seen quite a few that stick at "minimum" stroke and don't cool well, but I don't think that I have ever heard of one that did the opposite and froze the evaporator.

This car belongs to the center manager at a BPO in Bangalore that does some data processing for the company I work for. The evaporator was definitely freezing when we took a weekend side trip the last time I visited. It is a Daewoo Nubira that is rebadged and sold in some markets as a Chevy Optra and in the US as a Suzuki Forenza. It's a pretty conventional system with a V5 (probably S. Korean or Chinese made) compressor.

-- Steve

GM Tech on Thu July 24, 2008 12:49 PM User is offline

I have seen it several times on S-10's in high humidity ares-- I replace the control valve with a higher setting control valve and it solves the problem...

try this link

Control Valve Chart

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Edited: Thu July 24, 2008 at 1:57 PM by GM Tech

steve325is on Fri July 25, 2008 11:45 AM User is offline

That is an interesting read. I must have missed it when it was originally posted.

I suspect that my S-10 might also freeze in a more humid area. Central Valley, CA is usually pretty dry

Bangalore is not as humid as you might think when you think of India. It is around 3000 ft above sea level, so their climate isn't too bad. October can be quite nice.

-- Steve

bohica2xo on Fri July 25, 2008 11:49 AM User is offline

The wrong refrigerant will also make one freeze. An HC blend with a little too much R290 for instance... Has the system been serviced by any chance?


"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.

steve325is on Fri July 25, 2008 12:28 PM User is offline

I highly doubt that it has been serviced. The car is a 2004 with very low KMs, and he is the original owner. He takes it to the GM dealer for maintenance, but who knows what the quality of their service is.

-- Steve

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