LF: Zexel thermosensor

**yapoy86** · May 18th, 2019 09:38 AM

Originally Posted by jakewise

I got it from a dealer but said that it is not available already that is why I am trying to source outside nalang

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Just convert it to mechanical thermoswitch. Yung may adjustable knob.. i think standard naman yan 3 pin thermosensor.. parang ganyan din gamit ng kia at mitsu

**jakewise** · May 18th, 2019 09:46 AM

Originally Posted by yapoy86

Just convert it to mechanical thermoswitch. Yung may adjustable knob.. i think standard naman yan 3 pin thermosensor.. parang ganyan din gamit ng kia at mitsu

As mentioned earlier, I did that before but noticed mabilis mag shut off ang compressor ko kahit hindi pa masyadong malamig unlike the electronic one. That is why I thought na ang calibration is different kaya I am hoping to get the same electronic thermosensor to have the same comfort as it is

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**dr. d** · May 18th, 2019 09:57 AM

Originally Posted by jakewise

As mentioned earlier, I did that before but noticed mabilis mag shut off ang compressor ko kahit hindi pa masyadong malamig unlike the electronic one. That is why I thought na ang calibration is different kaya I am hoping to get the same electronic thermosensor to have the same comfort as it is

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doesn't setting the cool to maximum, help?

**jakewise** · May 18th, 2019 10:04 AM

Originally Posted by dr. d

doesn't setting the cool to maximum, help?

Surprisingly, it did not. I already set it to maximum but still shuts off even if interior is not that cold yet compared to the electronic thermosensor. I really wondered why it is like that, that’s why I presumed that the calibration of the mechanical thermostat is different from the electronic one. Hoping also that someone who is well versed on car refrigeration can chime in to comment on this issue if there is really a difference on the calibration of the manual to electronic thermostats.

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**dr. d** · May 18th, 2019 10:14 AM

Originally Posted by jakewise

Surprisingly, it did not. I already set it to maximum but still shuts off even if interior is not that cold yet compared to the electronic thermosensor. I really wondered why it is like that, that’s why I presumed that the calibration of the mechanical thermostat is different from the electronic one. Hoping also that someone who is well versed on car refrigeration can chime in to comment on this issue if there is really a difference on the calibration of the manual to electronic thermostats.

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has your aircon been "tampered with" ?
i mean, are the other components original?
i used to have a sedan. its evaporator sprung a leak. the aircon guy scrimped on the replacement component, by installing a cheaper model that fit the space, but was not a match to the car's aircon system. the resultant cool was "hilaw". replacing the evaporator with the correct but much more expensive evaporator model, brought the cool back to factory spec.

**jakewise** · May 18th, 2019 02:24 PM

Originally Posted by dr. d

has your aircon been "tampered with" ?
i mean, are the other components original?
i used to have a sedan. its evaporator sprung a leak. the aircon guy scrimped on the replacement component, by installing a cheaper model that fit the space, but was not a match to the car's aircon system. the resultant cool was "hilaw". replacing the evaporator with the correct but much more expensive evaporator model, brought the cool back to factory spec.

The aircon has been cleaned few months ago and was performing very well until yesterday, the same symptoms I experienced so many years ago before I had my thermosensor replaced also.

**oj88** · May 18th, 2019 10:52 AM

Originally Posted by jakewise

Surprisingly, it did not. I already set it to maximum but still shuts off even if interior is not that cold yet compared to the electronic thermosensor. I really wondered why it is like that, that’s why I presumed that the calibration of the mechanical thermostat is different from the electronic one. Hoping also that someone who is well versed on car refrigeration can chime in to comment on this issue if there is really a difference on the calibration of the manual to electronic thermostats.

There are other reasons why it would stop cooling prematurely. Some vehicles have safeties that will disengage the compressor when there are issues. Some of which are, over-charging/under-charging of the refrigerant, engine overheating, etc. It could also be the compressor clutch thermal fuse cutting supply to the coils (due likely to overheating or a short in the coil). These are just off the top of my head.

It's not my intention to make things complicated... just saying that unless you're absolutely sure that the above-mentioned temp sensor is really defective, I suggest you have it looked up by a qualified A/C technician.

**jakewise** · May 18th, 2019 02:28 PM

Originally Posted by oj88

There are other reasons why it would stop cooling prematurely. Some vehicles have safeties that will disengage the compressor when there are issues. Some of which are, over-charging/under-charging of the refrigerant, engine overheating, etc. It could also be the compressor clutch thermal fuse cutting supply to the coils (due likely to overheating or a short in the coil). These are just off the top of my head.

It's not my intention to make things complicated... just saying that unless you're absolutely sure that the above-mentioned temp sensor is really defective, I suggest you have it looked up by a qualified A/C technician.

Thanks for your input and I am fully aware of the other variables. It is just that the car is showing the same symptoms I had years back when I was forced to replace the thermosensor.
Earlier, I was at the local aircon parts supply here in the province and they confirmed that the mechanical thermostat has a different calibration from the electronics thermostat which confirmed my theory earlier. In this regard, I have no choice but to look for a supplier for the thermosensor.

**oj88** · May 19th, 2019 09:07 AM

Originally Posted by jakewise

Thanks for your input and I am fully aware of the other variables. It is just that the car is showing the same symptoms I had years back when I was forced to replace the thermosensor.
Earlier, I was at the local aircon parts supply here in the province and they confirmed that the mechanical thermostat has a different calibration from the electronics thermostat which confirmed my theory earlier. In this regard, I have no choice but to look for a supplier for the thermosensor.

So let me get this straight... The OEM sensor is the Zexel part no. you mentioned in the beginning of the thread. Then it became defective, so a mechanical thermostat was used in its place. That’s when your issue started happening (compressor turns off prematurely). Did I get the sequence right so far?

If yes, here are my questions:

1. What were the problems or symptoms you encountered that prompted you to determine that the OEM sensor (Zexel) was the culprit?
2. Did the issue with the compressor prematurely shutting down happened immediately after installing the replacement mechanical thermostat, or did it only started happening after a while (days, weeks, months, etc.)?