Have 2000 Jaguar S type 4.0 have a/c but can't heat blow out, heated seats work fine

SOURCE: 2000 jaguar s-type heat does not work from the driver side vent.

Hi there is a, dual valve down on the right side of the radiator to split the heat to each side. are the pipes hot where they enter the car be careful       D   

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: My 2002 s type jaguar doesn't heat. the fans

Probably the heater control valve, had same issue, started with one side not hot, then erratic, hot then cold while heat is set to hot, now both side are cold to lukewarm. diagnosed as heater control valve, common for jag s-types and x-types. located on the passenger side, down low the side of the radiator, it has several hoses into and out of valve, and a electrical connector.

SOURCE: 2000 Jaguar S type 3.0 Blows only cold air on full

Check the little pump below the brake booster for running and the coolant valve for movement.

Both hoses to fire wall should be hot.

Check for air lock in system.

Blend doors on this vehicle stop working....common complaint.

To verify Blend door movement, turn on ignition with engine off.

Run temp to max and the min..... listen under glove box for ( sliding ) motor noise as door swings from hot to cold.

This is a digital system needing a Jaguar scanner for diagnosis.

SOURCE: 2006 jaguar x type no heat AC works great. When I

I had this on my 2001 3.0 SE X-Type just after having driveshaft replaced. It worked for a week and one evening just stopped giving out heat, A/C worked as didi everything else but cold, no heat. Read that one guy sloved it by disconnecting his battery, so I disconnected the + terminal for a minute. Reconnected turned over and hey presto HEAT!!. Remember to keep your radio code handy.