Heater does not work and blows cold air only - 2001 Jaguar S-Type

SOURCE: cold air

Sounds like its the blend door actuator has failed or loose or cracked vacuum line going to it. These are usually not fun to replace although I dont know about your specific model, but most that I have seen you have to remove the dash.

SOURCE: heater on blowing cold on driver side and hot on passenger side

This sounds like an air damper is not operating, maybe a cable sticking or a vacuum line come off.

SOURCE: Heater doesn't work. It only blows cold air.

i have the same problem i have checked the wiring to the dual control valve (behind rad left hand side)and this appears ok, they do have a lot of problems with this valve i am about to take it off and check it out but it is not easy to get at will keep you posted

SOURCE: 02 Jaguar S Type - Heater blowing cold air

Has the vehicle overheated recently, if not there is a failure of the Coolant from engine valve controller, that measures flow through the Heater Matrix. Come back with more, as necessary.
Regards,DT

SOURCE: heater not working it is blowing cold air at all times is there a

Heater blowing cold air until I get on the interstate, then it works; however, when I stop at lights it starts blowing cold air again. The temperature gauge will be in the middle but the car will still be cold until the car starts moving.