Help with 2002 S-Type! Im COLD!
 

2002 Jaguar S-type, 4.0, Auto, 105K Miles.


- Hello! New to this site and this is my first experience with a Jag.

Having an issue with no heat. When I turn the heat on it feels like its just fresh air blowing out of the vents. I flushed the heater core until the water ran clear, checked for leaks, coolant levels are ok.

First thing I checked was the DCCV. I even unplugged it so it would stay open. The hoses coming from it going to the heater core are hot when the heat is full blast, so I know the coolant is getting through and getting hot. But air blowing is cold???

I was told by a friend that an actuator may not be opening properly?
Any ideas would surely help, as the cold Michigan winter is right around the corner! Thanks!

New Heater Control Valve
 

Hi cdavis,
It sounds as if you need to replace the Heater Control Valve to cure your problem. This complaint crops up now and then and in most case is rectified by fitting a new Control Valve unit.
This Control Valve should be readily available from your nearest Jaguar agent.
Hope this is of assistance.
Regards,
Inver.

The heating system is actually simpler than it seems. Hot coolant in the heater core heats the air blowing over it.. All the mechanics are controlled by the climate control module. Sounds like the DCCV (Heater Control Valve) is working properly. Also, you ruled out the heater core, I assume by your post.. So, that leaves the control module..Have you tried adjusting the temperature to "high" and see if that changes things? If it does than I would start with the cabin temperature sensors. If it doesn't have you tried changing modes manually and notice how the air flow changes? These tests should tell you if the sensors, air diverters, or control module are the source of your problem.

No Heat
 

Hi, Another thing to check is the outside temperature sensor. Is this reading correctly. If this is faulty, it can affect the interior temperature control. This sensor is cheap to and fairly easy to replace.
Regards,
Telfer.

Have you looked at replace the Heater Control Valve. Look down in the right front of the car and you will see it at the very bottle. Just follow the heater pipes to the front of the car. The heater valves are common problems on these cars with heating issues.

I have a spare ccm in black if you need me PM me if you do

He already checked that... The DCCV and the Heater Valve are one in the same....

Also check and replace the evap temp sensor. My climate was acting funny in my 02 and replaced it and no quirkes

Hey guys - thanks for all the replies.

A friend told me that it was an actuator that was incorrectly diverting the hot air somewhere else... He told me to look behind the glovebox and "I'd see 3 motors, about half the size of a roll of quarters... The very bottom one might be stuck, so use an allen wrench to manually move it...".... I'm new to Jags and couldnt locate any of these motors.

And about the sensors....Where are they located? I need to invest in a Hanes manual....

Thanks for all the replies

Oddly enough, it seems when I press the "auto" setting it always turns the A/C on.. not sure if thats normal.... I've cranked it to the HIGH setting and it still feels like its blowing the outside air in. I ordered a new Heater Control Valve because I got a good deal on it, so I figured it wouldnt hurt to replace it even if the older one isnt shot yet...

The outside Temperature sensor seems to be working fine, and reading accurately.

All the controls on the Climate Control Panel seem to be working correctly...blows in the right places, at the right level, just no heat.

Maybe a sensor could be off because when I hit AUTO it kicks the AC on... but when I adjust it manually shouldnt it blow at whatever temperature I set it at??

A secondary purpose of the a/c is to dehumidify the cabin air so it should kick on with the heat if you crank the temp up on auto.

If you crawl in the driver floor board on your back you will see two plugs on your left side one about 6" above the acelerator pedal and one higher towards the top it should be about the height of the bottom of the radio on the evap box. Insert a jewelers flat head to unclip the connector and then use the same screwdriver to unclip the sensor out of the box if the sensor is discolored replace it

Thanks alot, I'll check that in the morning...whats the name of this sensor/ whats the purpose? If it IS discolored, would that be the reason for no heat?

Check the sensors....they both seem to be okay and clean.

Did you spray them down with electronics cleaner or MAF cleaner?

Also have you tried to unplug the electrical connector from the DCCV and bring the car to operating tempratire to see if you have heat?

If you leave the connector unplugged and no heat you might have a bad dccv or the aux pump might be bad.

Have you followed the harness from the dccv and checked for chaffing? The 99-02 harness runs under the core support and chaffing can occur

I'm having the same problem, except I can get heat when I take it out of auto operation. As long as I set it for the hottest setting and use the fan control I get heat. Try and use auto and I get mildly cool air. It's my wife's car and she didn't understand how to get warm air until I started messing with it. My best guess would be a sensor, but I'm not familiar with climate control systems. What should Ibe looking for? Also even with it on single mode operation(dual mode off) the passenger side air feels a bit warmer than the driver's side. What could cause this? Thanks.

Check the sensor above the ignition key made sure it's clean it's the cabin ambient temp sensor

Ok, I'll give that a check. Thanks!

Hi Torrid,
which engine and year ?

Giacomo

I've got the 2000 4.0. It looks like it is the DCCV, only I can't find the part by this name when looking online other than DIYs. I'm getting warm air on the passenger side and cold or freezing air on the driver's side. Would this be the right part if it is the DCCV? Thanks.

http://www.thepartsbin.com/catalog/?...365+4294952375

The DCCV is sometimes called a heater control valve. That's how it's listed on Rockauto. Be aware you will save money by getting the Lincoln LS part.
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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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another possibility
 

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 :)

More Heat on tap
 

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

heating problems
 

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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No heat at low speeds but great on interstate
 

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/