How on earth do you remove this animal that is a temp probe to the evaporator? I have zero problems getting both hands on it, but have been reluctant to apply too much force in fear of braking one of the 2 clips holding it in. Is there some suggestion, since it seems tight on the firewall, on how to depress at least on the clips. If I did break the clips or one of them- where would it go- down the firewall or block the path of the new temp sensor?

Thanks
Tom in Dallas
2005 S-type 3.0

 

It's been a decades since I worked at the dealer but I think it is a 90 degree twist and OUT?

 

I used brute force and ignorance. I don't remember any trouble getting the sensor to pop free from the housing. IIRC, it came straight out, no turning required. Get a screwdriver or thin pry bar under there to assist. On the slim chance a clip breaks off, it would fall harmlessly to the bottom of the evaporator case.

Remember to remove the connector first. It's a lot easier to undo it while the sensor is still installed.

 

Thanks

TBB

 

So the worst I can do is nothing horrible.

Thanks - that gives me more confidence.

I am now, as during the colder months, still have the compressor short cycling, but wanted to wait until it warmed up and see if I could better judge. Had the Freon checked- not the problem as it was not before. So I am stuck with either this temp sensor, the pressure switch up front or something going on with the compressor. If I had the original styled compressor where I could disable the variable valve, I would, but when they replaced it in 2013, Jag put in one that did not even have the valve.

So step one of potential 3 replacements. Still think I am showing incorrect misreads of the temps at the evaporator turning the compressor on and off. Even though the correct temps "showing" for on and off, actually in reality not the correct temps. (35.5 degrees = off and 39.4 degrees =on), but not that cold in reality.
Question, the reader I am using for jags shows the ac system pressure in volts- how the devil would I have any idea how to translate that to AC system pressure?

Just a reminder. Ihave never ever used the auto setting in the car- not once since I owned it. Normally in the summer I keep it at low and adjust the fan speed to control the temp inside the cabin and always use recir. as there is no fresh air to be had in Dallas so that takes a whole bunch, that I have already tested anyway - out of the picture.

T

 

Yes they pull straight out.
They all should read the same resistance too so look for one or more that's different.
Some threads about the sensors might help?

Evaporator Temperature Sensors
More Evaporator Sensor Info
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The other 2 never come into use for me with ac, never have ever used "auto" and keep the setting at low in the summer. I will take your word on the straight out. I am sure, like me, you are hesitant to force things when not sure of the result.

Thanks Kevin

 

And then there's me:

https://www.jaguarforums.com/forum/s...cement-269327/

 

If it worked and you were ready to suffer the consequences of what might happen- then who am I to differ. However I always like to make sure what I can learn from other people that have already done the same thing. We will give you 3 vulgar cheers for ingenuity.

TBB

 

Ahh! The "Golden Hammer" trick!
Very crafty!

Very true on forcing things but those sensor are cheap and easy to get so even if you break them trying to get them out not a big deal.
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Kevin- you were right- pulls straight our with no muss and fuss. the connector was easier to get off once out than when it was in as I could turn it around.

Only thing i notice is a slight part number difference. Both are Morotcraft and the one that came out was #

XW4H19C734CA and the one I put in was XW4Z19C734BA

 

Interesting as when I was changing them I thought all of them were identical?
Yes I think that was why I started pulling them out? I had a hard time getting the electrical plugs off with the sensors in place up under the dash.
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Looking at Rock they say the following on YH-1504: OEM / Interchange Numbers: XW4H19C734BC, XW4Z19C734BA

So it apparently has to do with part number changes that seem to take place for their database.

TBB

 

Thanks to kr98664 (Karl) the problem is isolated to 1 problem.. The one that is germane was the evap Temp sensor. It does just pull straight out.Replaced ad my ac vets blow 40-41 F degrees. The other was a bad thermometer that was showing temps, be it in the car or the house that were 16-19 degrees higher. A new one solved the issue..

Thanks All
TBB

 

Great news! Did the bad evap. sensor have a different resistance? How did you know it was bad?
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Resistance was fine, at least at 70 degrees. I did not bother to test much on t as frankly I do not care why it did not work, it just did not and when the new one worked- then the old one became irrelevant. Especially when yo are buying a part for less than $20 that solves the problem. How do I know it was bad? With the old one I did not have proper cooling and despite the bad thermometer problem, I could tell there was inadequate cooling. The new one has the AC working the way it should. That is pretty good prima facie evidence.

TBB