HELP my A/C blows hot air
 

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

RE: HELP my A/C blows hot air
 

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..

RE: HELP my A/C blows hot air
 

Where is the pin at?

RE: HELP my A/C blows hot air
 

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..

RE: HELP my A/C blows hot air
 

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

RE: HELP my A/C blows hot air
 

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

RE: HELP my A/C blows hot air
 

Is it the red, blue, orange wire?

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RE: HELP my A/C blows hot air
 

Have you gotten to the bottom of this? I have the same s-type and same problem. Had the heater control valve replaced and still blowing hot mixed with a/c. A/C recharged already and the dealer is clueless and wants to keep throwing parts at it at significant cost. HELP. I live in Phoenix and no a/c is serious business when it is 110+.

RE: HELP my A/C blows hot air
 

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.:(

RE: HELP my A/C blows hot air
 

:eek:

RE: HELP my A/C blows hot air
 

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

RE: HELP my A/C blows hot air
 

hahhaha good one happy 4th July :D

RE: HELP my A/C blows hot air
 

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

RE: HELP my A/C blows hot air
 

I have a 2003 Lincoln LS which is the Ford DEW version of the S type. I also had changed the heater valve (DCCV) and the thermostat and verified the Aux. coolant pump was working. Still had only sorta cool air. Finally changed the in cabin air temperature sensor. This is the one behind the grill right above the ignition switch. It pretty cheap and not too bad to change. Don't get rough with the plastic dash pieces. The old sensor was crudded up and after replacing it my car has ice cold A/C again.
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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.