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Discussion Starter #1
Hi All,


I have an issues in Grand Vitara 2008 compressor when run AC, it never stop, two technician tell me that because the evaporator thermostat, (its number is 9554164J00), I tested it with Ohm meter, I didn't remove it yet from the car just measure both ends in the socket under the main panel (test the degree in the hood), as these:
18 degree = 8KOhm
12 degree = 5.12KOhm

is this normal? is the thermostat Unscrewed from his place? Can anyone help me for that
(attached picture from the internet)
BR
 

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Discussion Starter #3
Thanks Droniel, In fact I went to 2 car aircon specialist, they tell me that the problem twith the sensor, but how can I know the sensor is work or not, how to measure it.
 

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Most valves have a Schrader valve in them and the sensor and be removed. If it does not have the valve than the system needs evacuated prior to service. Sensors often times fail and if the sensor is out of spec the shop who diagnosis it should be able to tell you why it's bad. If its a normally closed switch it might be reading open or if it's NO it could be reading closed.
 

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If it is the switch that is causing the system to run that will mean that it is stuck closed, remove the harness connector and use a MM on Ohms..
 

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it can be 2 things causing this constant run issue, pressure switch stuck closed, or the evap sensor is faulty. I'm not able to find the evap sensor values at this stage but will try and look them up later today along with the test procedure.
 

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Discussion Starter #8
Thanks all to your reply, I have some point to mention:
This car stoped around 2 years not move, when run all think ok but the condition hasn't ferion, I bring the car to aircon specialist, he test with air and tell me the pressure is ok, then after feed the condition with ferion the AC is work ok and the car is cooled but he noticed that the compressor never stop he tell me that bcz the sensor on cooler inside the car, in fact I have in the past old car toyota 1989 have the same problem, I just put an (ON/OFF) thermostat of fridge under the hood on the pip that come from compressor to the cooler inside the car, all thing be right.

But I noticed in my grand vitara that, when I disconnect the sensor the compressor stop after around 2 seconds but the lamp in panel flash, when reconnect the sensor the compressor then re work and the flash stop, I read in internet about some condation and see some things as that the sensor not (ON/OFF) it work as a thermal resistance.
I made my measurements as in my first post and want to know: is this a write way?, Is the problem from the sensor or may I should disconnect the battery from car around 10 minutes to reset the computer?
The sensor is thermal resistance or on/off switch?

BR
 

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2013GV, in your GV is the Compressor getting recycled? mine also run continuously thought it was by design :rolleyes:
no, my compressor cycles on and off as it should. Don't get confused with the outer pulley turning all the time, the "inner" is the bit connecrted to the compressor and you should see that start and stop.. If its running all the time there is an issue, or your ambients are getting towards 40C
 

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no, my compressor cycles on and off as it should. Don't get confused with the outer pulley turning all the time, the "inner" is the bit connecrted to the compressor and you should see that start and stop.. If its running all the time there is an issue, or your ambients are getting towards 40C
Oh, in that case mine also seems running continuously (Not hearing any Clutch engagement, as it should), perhaps the pressure needs to be verified same time should check the resistance in Thermistor. usually, dont think Thermistors going bad frequently? :rolleyes:
 

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thermistors do fail, but not often. Get it checked for correct pressures and operation by a pro, its easy to over pressurise these systems and destroy components. Pressure switches do fail, and these do need a full vacuum down and refill if replaced, there again, a pro should be able to diagnose any issues pretty rapidly.
 

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Discussion Starter #15

thanks All friends, I Just buy a new thermostat from internet, just waiting it to arrive then test its values as in the picture, I have 2 Qs:
1> could you provide my with the source of your picture? it is general or for this type of sensor bcz I seen as this picture but with deterrent values but for another condition (may a home condition)
2> if the problem from sensor I will may install it under the hood, I don't want to reassemble and assemble the car interior decoration to just remove the old thermostat and install a new, the Q: IS it enough to install the new sensor on the pipe that came from compressor into the evaporator under the hood? (this is important Q for me, I want to know the disadvantages of that)
BR
 

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it must be installed in the correct position for it to sense the correct temperature, do not install it on the on the pipe from the compressor to the evap unit as that will never be at the correct temp as its before the expansion valve and will always be warmer than the evap core
 
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