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AC compressor running full-time

zack206 on Sun August 07, 2011 10:24 AM User is offline

Year: 2006
Make: Suzuki
Model: Grand Vitara
Engine Size: 2.0
Refrigerant Type: 134a
Ambient Temp: 30-35
Country of Origin: Yemen, Republic of

Hi guyz I'm a new member in this great forum

The Ac compressor is running with out being disengaged and from what the technician said ( I'm not sure if he really knows what he's doing LOL) is the AC evaporator temp. sensor is not working and needs to be replaced and that means the whole dash board needs to be taken out

I measured the air temp. that comes from the ac by a thermometer and it was reading like 4.5 - 4.0 C (40 - 39 F) so my question is at what temp the ac compressor stops to make sure it's really the AC evaporator temp. sensor that causes the problem

P.S: the test was done while the car was idling

Car info: 2006 Suzuki Grand Vitara - climate control system

mk378 on Sun August 07, 2011 11:12 AM User is offline

I would expect it to run all the time while idling in hot weather. Set the interior fan on low, rev up the engine, and it should start cycling on and off after a minute or so.

The sensor is designed to cut off before water can freeze on the evaporator and block it with frost. If you were having that problem while driving the vent temperature would go down to near zero C. That is great, except that after driving for a while the airflow would diminish and become warmer because of freeze-up. It is seldom a problem in the desert due to low humidity.

Edited: Sun August 07, 2011 at 11:26 AM by mk378

zack206 on Tue August 09, 2011 7:43 AM User is offline

Thnax mk378 a lot for your quick respond
I revved the engine for like 10 mins with fan speed set at low and still the compressor won't disengage... I wondering why I didn't get a freeze-up when I drove a 100 KM while the humidity is kinda hight coz it's a coastal area !!!!

mk378 on Tue August 09, 2011 9:26 AM User is offline

Could also be a variable compressor or a STV system, in both of those cases the compressor normally operates continuously. I'm not sure exactly what that model would be equipped with.

Generally the rule is if you're getting cold air, don't mess with it.

zack206 on Sat August 20, 2011 10:57 AM User is offline

many thanks mk378 ! sorry for my late repaly :$

I guess it's probably a clutched compressor since I checked some other 2006 GVs and I found that the compressor disengages at 7-7.5 C ( 44.6- 45.5 F) @__@ don't know what to do !!!

Edited: Sat August 20, 2011 at 10:58 AM by zack206

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