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Freezing up

mhfd112 on Fri July 25, 2014 11:34 AM User is offline

Year: 2008
Make: Chevy
Model: Aveo
Engine Size: 1.6 L

After about an hour of driving, the low side line freezes up and not much air comes out the vents. Switch in the high side line has been replaced. From reading on the internet, it sounds like there is a control valve in the compressor that might be stuck. Is this something I can change or do I have to put on a new compressor?

Thanks,

TRB on Fri July 25, 2014 2:11 PM User is offlineView users profile

It's a V5 so you should be able to replace the control valve if needed. Be sure to use the correct color control valve.

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mhfd112 on Fri July 25, 2014 3:33 PM User is offline

Thanks Tim!

It's a blue one. I gave him your phone number so he can get one ordered.

mektek1 on Wed August 06, 2014 2:25 PM User is offline

I had a similar freezing problem at highway speeds. I replaced the o rings on the control valve and the problem went away.

2005Equinox on Mon August 18, 2014 9:09 PM User is offline

So this isnt really a huge deal. My mothers 2007 does this.


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2008 Chevrolet Impala LS
1981 Pontiac Bonneville


2007 Sears Craftsman Lawn Tractor


1985 Chevrolet Caprice


1986 John Deere 165 lawn tractor

mk378 on Mon August 18, 2014 9:59 PM User is offline

Another thing that will cause freezing is if someone opened the system and then recharged without removing the air. It can freeze at the proper pressure if the refrigerant is not pure.

wptski on Tue August 19, 2014 8:03 AM User is offline

Quote
Originally posted by: mk378
Another thing that will cause freezing is if someone opened the system and then recharged without removing the air. It can freeze at the proper pressure if the refrigerant is not pure.
I thought that caused excessive high side pressure ?

mk378 on Tue August 19, 2014 8:57 AM User is offline

It does that also.

The issue in the evaporator is that the partial pressure of refrigerant in the mixture is less than the total pressure that the control valve sees, so the evaporator temperature can go below what would be expected. The same physics make an Electrolux-cycle heat operated RV refrigerator work. Even though the pressure in the evaporator and condenser and throughout the system is nearly the same, the composition of a mixture of three fluids varies in the different parts.

Edited: Tue August 19, 2014 at 9:01 AM by mk378

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