It will either be the valve the CCM or both or possibly corroded wiring, you can clamp off the lines from the valve to the heater core to stop the flow and prove the ac is good then start troubleshooting the heating system from there.

 

Thanks Norri, but I would not know which lines were which to save my life. I will look into having someone do the test. Good help is so hard to find these days.

 

If you want to know, refer to the workshop manual (JTIS) - free download.

 

I recently had the shop to replace the compressor , AC dryer/receiver and the expansion valve on my 2001 jag s type 3.0. The compressor is new Nissens compressor and it has the plate with the valve and spring which is noted in TSB that was mentioned before. My question is, should I still consider changing the valve and spring position on this compressor even thue it is new to help cooling performance at low speed or when idle? The fan runs also but I'm not sure if it changing speed. Please respond with any experience you all have. Thanks

 

I wouldn't do it until/unless you start to experience problems, as you will need to vacuum down and recharge the system.

 

Sorry I was not clear. I am experiencing no cooling when idle or low speed with this new Nissens compressor and wanted to change the position of the valve and the spring based on the TSB. Just wanted to see if this could help even if the compressor is new. The system was vacuumed and recharged when the new compressor was installed. Thanks for the reply

 

I see, if the compressor is not working can't you return it?
If you mess with the valve and it doesn't work it's going to be a problem.
Have you checked the pressures?

 

Thanks Norri !
Since I had the car I noticed it is hot when idle, no A/C. We are a hot country with heavy traffic, so not quite pleasant in the car while stuck in the traffic..
I had a suden leak from the front A/C radiator, so I went to a mechanic friend for repair.
It was found that a stone (about 2 cm diameter) hit the grill and bumped into the A/C puncturing it. We had that fixed, and since the system was empty of gas, I asked the mechanic to take of the valve and make the spring position fix as described in the JTB00183 tech bulletin. Lucky I had it printed out since he did not believed me of such an error in the compressor.
So we took out the valve and the A/C specialist confirmed it was reverse installed. We did the gas refill procedure and here we go!!!
A/C is working perfect for few weeks now.
Big thanks Norri !!

 

Sorry to ask this 6 years later, but I have 2 questions.
Can this mod be performed while the system has refrigerant and if so, why does it state to evacuate and recharge the system at the end of the bulletin and is it necessary?
Rk

 

You would be breaking open the pressurized system to access the piston for this mod. You would lose all refrigerant. The official Jaguar service procedure is to reclaim and re-use the refrigerant with a special ($$$) machine, so that is how their instructions are written. In the real world for us mortals, the nudge nudge wink wink method is to vent the system to empty it.


Yes, this is very necessary. Once the pressurized system is open to the atmosphere, you must do a full vacuum evacuation and then refill by weight.

Using my amazing psychic powers, I'm thinking your AC performance is not up to snuff? If so, try working through this guide:

https://www.jaguarforums.com/forum/s...ol-how-185002/

If you determine the piston mod is needed, more details are in the middle of post #4.

 

I read that in all the way through. Long post, well written and very informative. My issue is the temperature getting warm on idle. It gets colder the faster I go. I have put the car into neutral at every stop light to Rev the rpms to keep it cool, but that is getting old really quick. I have tried, add a little and see (BTW, low pressure inlet behind driver's tire is just plain dumb) and it did not resolve it. I am in Florida and the dash outside is saying 97 and driving the Jag it gets too hot. I also don't know if the previous owner tried to add a little freon and I didn't want to chance over charging and risk making the issue worse. If price is reasonable, I think I will get someone to evac and recharge it too see if it resolves it. The car is 16 years old. 05 S-Type 80k miles

 

Anyone have an success cleaning the evaporator? Do you think that would make a difference? I have seen people go through the drain tube, but that would not work on this car since I think the drain tube is not accessible. What would be the best way?

 

In theory, the cabin air filter should keep the evaporator relatively clean. The filter is just upstream of the evaporator, so it should catch nearly all debris that might otherwise end up there. I'd replace the cabin air filter to be sure, and see if that helps.

Keep in mind you may have several minor faults affecting the AC performance, not one single magic bullet that will suddenly restore great performance. Work through the troubleshooting guide and fix what you find and then retest.



Sounds dangerous. Hope they don't get stepped on.

 

RKTek,

I feel your pain. I live in south Louisiana and lack of a good working AC is a becomes a pain. I am the OP, see post #1 and #7. My problem was just like yours. Ours car was only 11 years old at the time but had almost identical mileage. The only other thing, that comes to mind, that would cause the AC to work poorly at idle and improve with speed would be an anemic (radiator/condenser) fan, but then the engine temperature should reflect that at low speeds. I was suspect at first that a compressor could have such a defective design, but it cured my problem once I reversed the valve and spring.
Hope you get yours resolved.
Tailwinds,
Charlie

 

Yes, your issue sounded exactly like mine. I will try the rag over the grill to rule out any fan cooling issues caused by the fan. I haven't seen the temperature change after it warms up. But if I Rev the motor up to 1500-2000 rpm while sitting it remains cool. It is an electric fan and I don't think the speed of the fan would change when the rpms rise. For 16 years old I guess I can't complain too much. Stop and go traffic sucks because the interior temps never really cool down, unless it is at night or raining.