My heater is not blowing hot air, i have a jaguar s type

here is a link to a fault finding procedure

#1 could be a clogged heater needing flushed #2 could be a malfunctioning warm/cold air door motor located under the dash. #3 could be the temp controls on the dash.

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Sounds like your heater core could be blocked up or a blockage in the pipes. Most car heaters run off a heater core that cycles hot water from the engine's water jacket, or a heat exchanger around the exhaust manifold, through the core, with a fan then blowing this hot air through the vents to you. If the pipes from the water jacket to the heater core are blocked then no hot water will get through. Alternatively, the heater core or pipes may be damaged and leaking. Check to ensure you're not losing any coolant. If it's the heater core, there's really nothing for it but to replace it. I'm not 100% sure where it would be on your car, on my old car it was up behind the centre console, under the dash. Hope that helps. Cheers, John

sounds like it ,could be the clima computer ,

Sounds like your heater core is leaking and you definatly need that to be fixed.

check for hot water, check for power to blower, do a little work yourself before asking questions, if you can't do this then you really need help

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.

my heater only blows cold air please could you give me some advice on this thanks . everything else is ok temp ,engine etc

You have 2 zone temperature control control. The heater control valve has failed and is open allowing the passenger side heater core to stay hot.
It is a very common problem and expensive to repair. It tends to be an intermittent problem and sometimes will work properly.