Apparently I, like several thousand others here, have the no heat problem with my 2002 S-type 3.0. What id like to know is this; is there a way to test the cabin sensors or to bypass them for testing purposes of the heating system? can the sensors be checked for proper operation? can the connectors be jumpered or energized to fool the system into thinking its working? i realize these are not the most expensive parts but i'd like to be as sure as possoble before spending my hard earned yet meager wages... thanks

 

They can be read via OBD commands, but the software supporting those commands is specialised (IDS, maybe WDS, AE etc) and so quite or very expensive.

Otherwise, you might make up a sort of T cable to connect into the CCM's connectors so you can have it in circuit as usual but also measure any signals you choose. There might be more convenient places to use a T, but the idea's the same.

Then demand various temperatures (extremes, for instance) and even with a bit of heating/cooling you could watch the sensor values.

A bit more than a T cable would let you energise the actuators (air flaps etc).

The pain of this is why the OBD commands are there. Car makers generally, jag included, don't publish freely what the commands actually are, so no cheap or free tools exist.

 

The problem is your interior temperature sensors are most likely NOT your problem. So if you bypass them nothing will change because they are working correctly. If you search a bit you will find it's almost certain to be your DCCV. Change that and see what happens.
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I'm about 98% sure that it is the DCCV after reading the forum and doing some testing. I was hoping that there was an easy way to test whether the sensors were good or bad, (maybe by getting a resistance or voltage reading across the part.) based on the partial heat on one side and none on the other its probably the valve. So off I go to find one.

thanks again for the input.

 

You can remove the fuse for the DCCV and it should be open with no power. With the valves open you should get heat on both sides. If not it is your DCCV. And you can get the motorcraft replacement its cheaper. I think the 2002 has the 5 pipe DCCV.

 

ordered the DCCV from amazon yesterday
1 of: Motorcraft YG355 Heater Valve [Automotive]
Condition: New
Sold by: Amazon.com, LLC
$137.41


Item(s) Subtotal:$137.41Shipping & Handling:$6.23 -----Total Before Tax:$143.64Sales Tax:$0.00 -----Total for This Shipment:$143.64


price looked to be the best of any that i have seen.


there were also parts available for the Lincoln LS at Autozone

Everco/Heater Control Valve









Part Number: 74009

this looks to be the same part (different mfg ) with a different part number, not sure if it is quality item but i know that there a members working on compiling crossover parts lists, so id thought id let you know.

 

Thats a better price than I paid I bought the bosch before I knew that I could buy the motorcraft.
make sure your DCCV is the 5 pipe type. I think the 2003 and up have the 3 pipe type and its cheaper. If your is late 2002 you might want to check.

 

I just ordered this on Feb 17 from Amazon and it was only $133.73 with free shipping. Received it in 3 days. Did they raise the price that much in 2 weeks?

It has been suggested that a good pair of hose clamp pliers is very beneficial. Here is the one I ordered. http://mlautomotiveonline.com/OTC-To...-P1313539.aspx

 

I bought mine from amazon a couple of weeks ago for a 2005. it was $88.00

It came in the motorcraft but on the bottom of the valve it was clearly stamped Bosch made in France.

http://www.amazon.com/Motorcraft-YG3...3122259&sr=8-1

 

Finally had the time to install the the new DCCV. It's amazing that a part so easy to see is that much of a pain in the a#$ to remove. Outcome, new valve in, heat works like a champ, i forgot how hot that climate control can get this car. thanks for the info and advice everyone.

JC