See https://www.jaguarforums.com/forum/s...355#post205102
Should be cheaper.

 

Thanks everyone. Knowing that little detail for the Ford Motorcraft part is going to save me $80.

 

Did a little more fact finding before I just ordered a part. I'm not so sure it is DCCV unless someone can explain it to me. I've heard people say that one side might be hot while the other is cool even if they are both on the same setting. The A/C works just fine. The heat only works on the passenger side upper vents. With all vents on and on HI with the fan maxed out not using auto, the two upper passenger vents are hot. All other vents including the passenger side floor and rear vents are cold. I thought DCCV just did left and right? Would there be another vent valve in the dash somewhere I am missing? I didn't get a chance to actually get to the DCCV and test it as it is dark right now and I'm not looking to get that far into it tonight. Maybe I'm going completely in the wrong direction as I no nothing about climate control systems and I'm still learning, but maybe someone will have a good idea. Thanks.

 

I don't think you are missing anything. The DCCV is a wear item and I would change it and the thermostat as well as swapping in new correct coolant. Flush the cooling system thoroughly. I am a bit picky about this and flush mine several times and drive around for a day or two with just water to make sure I have removed as much of the old coolant as possible.

I would not waste my time checking the DCCV, just change it. The only other possibility (since you have the old Gen I S Type) is wire harness rubbing of the wires leading to the DCCV. This is not seen in the Gen II (2003 and up) S Type cars. So a check of the electrical plug going to the DCCV to make sure the proper power and signals are getting to the DCCV might be done when changing the DCCV. It has been reported that the wire harness problem is in the bumper cover area where the harness is routed in a bundle.

Now you might have multiple troubles. So change the DCCV and other items first. Your car is old and if the DCCV is not bad now it is most likely failing. Remember the DCCV does not always fail the same way or stay in the same position. You can exercise the valves by running the temperature all the way up to 90 F. and then all the way back down to 60 F. This sends control signals to the DCCV and can sometimes free up the valves. Some people have used this little trick to avoid changing the DCCV. But it will only work for so long.

Yes there are several temperature sensors that can be bad or dirty. Especially the one above the ignition key switch which draws air in from the cabin. If the car has been smoked in this will have some buildup but how much is always unknown. You also have a AUX coolant pump that can cause lack of heat at idle or other low engine speed conditions. Your symptoms do not sound like this but just keep it in mind.

Also a more remote possibility is the bad/failing DCCV will take out the climate control module. This is more likely the longer you drive the car with a bad DCCV. See other threads about this.

But do the easiest and most likely thing first. Then use the car and see how it acts. You have a very common problem that many people have fixed. That is the good part!!
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is the climate control module. these are easily repaired. cheap enough fix.

 

Autoexpresstech,

If you want to advertise your site or business you will need to contact the site admin.

I've removed the offending part of your post.

 

Well I ordered the DCCV as it looks like the only the passenger side valve is responding. I've set it for next day air so I can fix it this weekend and I'm only out $158. I'll then go from there if I have any remaining issues. After checking it again, auto works perfectly, but as with HI heat setting, only on the pass side vents. Thanks everyone.

 

Any tips on swapping this thing? I was going to do it today, but I'm finding that it might be easiest to completely drain the coolant and remove the upper radiator hose completely and I should be able to get to it. What coolant do these use factory? I can tell the coolant is clean and has been recently replaced, but it appears to be purple in color.

 

Purple? Oh. It should be the orange OAT Dexcool-type stuff.

If you're lucky, either someone flushed incredibly thoroughly OR it's the correct type but purple (I understand Ford have one). If unlucky, it'll have reacted badly with the proper coolant and created gunge that's blocking some or lots of the coolant paths. Be afraid

Anyone know how to tell?

 

I'll just completely drain and flush it then. That actually would make it easier for me as I always keep Dex-cool around since my other car is a GTO. I thought it was Dex-cool when I first looked in the coolant resevoir, but I drained a bit to check it out and it looks like it had a tinge of purple. Makes me think someone topped off with the Ford stuff once. I know Dex-cool has a tendency to make sludge when mixed with others.

 

I just finished the car about an hour ago. It was straight orange so I just drained it and was able to get the DCCV out with a bit of wiggling. Got the new one back in much easier than the old one came out and now I'm no longer freezing! This fixed my problem.

 

Excellent! Progress

 

Hi,
Well done and pleased you have managed to fix the problem.
Regards,
Inver.

 

What color is the sensors supposed to be that are located unDer the driver floor board?
I am not getting heat but everything else blows and sends air

 

Please start another thread. Your question is confusing.
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my 2002 s type jaguar heat doesnt work at low speeds but works perfect on interstate, please help

 

Hi Tim,

Do you have the V6 or V8? The V8 has an auxiliary coolant pump that improves heater performance at low RPM. If inop, that could cause your symptoms.

On my '02 V6, if the.coolant level drops, the heater stops working at low RPM. Rev it up and all is good. So maybe right off the bat, check your coolant level, regardless of which engine you have.

LOTS more details here, specifically posts #2 and #6 for your situation:

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