Hi everyone OK this is my problem I got a 2003 S-Type R my front left and right and the rear back vents is blowing hot air when I turn on the A/C and the front middle vent is a lil cold but not as cold as it should be. So I took it to a shop after it got the A/C recharge it was doing the same thing so I took it to another shop that work's on Jags they put it on the machine and told me it was the heater valve and auxiliary water pump so I got those change and it still does the same thing. PLEASE HELP me if you had the same problem know what it is Thanks

 

have had similar problems after installing valve.. found out that the pins were stretched out.. after i pushed them in..worked perfectly.. also had heater core.. also have seen post evap sensors fail..

 

Where is the pin at?

 

pins... are right front lower side.. under the electric pump passenger side.. of the engine pay.. front of engine between rad fans ,..
also had corroded harnesskeeping valve not closed..

 

I'm gonna give it a shot, ill try to find it do you got any pic where is at?

 

no .. connector is there if you look staright down.. 3 pins..

 

Is it the red, blue, orange wire?

[IMG]local://upfiles/4320/06C6F5FD0CE24F46AB5B831E4A4B879A.jpg[/IMG]

 

From this day I still don't know what it is, but when I find out Ill post it up but if you find out let me know. and all i got to say about the heat is park your car n drive your other car that's what im doing.

 

 

Mike find yourself a nice girl that blows cold air problem solved! have a good 4th of July

 

hahhaha good one happy 4th July

 

check out this link i tired messing with my car but it didnt do any thing mybe ill fix your problem
http://www.jaguarforum.co.uk/viewtopic.php?t=2600 let me know if you find out what it is

 

Still blowing Mix Air anyone have the same problem and got it fix?

 

Help!!!

 

I've had the same problem with my Jag. Replaced the same valve as you. I've been told it is the climate control head unit that is causing the problem. Haven't had it replaced yet..it is next on my list.

 

keep me posted if you find out the problem because it sucks to drive a Jag on summer time with your window roll down when is over 100 degree.

 

My guess has already been suggested, corroded wiring loom which can cause a number of problems. This being one of them, fairly common on the later facelift cars.

 

Follow this procedure to help narrow down the possible source(s) of this problem.

Use a multimeter and take some measurements:

1. Run the engine.

2. Set the controls to max "Lo" for both driver and passenger sides.

3. Confirm that the air is still blowing hot (take note which vents blow).

4. Disconnect the plug from the coolant control valve and take voltage measurements at all 3 contacts in the plug. The middle contact should read 14v or so.

5. Take resistance measurements at the 2 outer contacts in the plug (measure between each contact and a chassis ground). The 2 outer contacts should read close to 0 ohms.

6. Jumper the middle contact in the plug to the middle contact at the valve. Jumper one outer contact in the plug to the corresponding outer contact at the valve using the multimeter to measure current. Be careful that you don't short anything with the middle contact in the plug (it's always hot +12v-14v). Repeat the measurement at the other outer contact after disconnecting the first outer contact (don't disconnect the middle contacts yet). Each measurement should read 0.6 to 1.1amps.

7. With the middle contacts still jumpered between the plug and valve, jumper an outer contact on the valve to a chassis ground, while using the multimeter to measure current. Check to see if any vents blow cooler air during this grounding process. Repeat the measurement at the other outer contact and check the vents again.

8. Reconnect the plug to the valve.

9. Shut off the engine.

10. Report the results.