No heat, how do I tell what is causing this? - 2002 Jaguar X-Type

Ours do that and they tell me the noise is caused from the steel radiator expanding as it heats up. There is nothing wrong out side it can be annoying when it happens. This is normal when heating with these units.

Overheating a vehicle can cause many problems from blown gaskets which would cause vacuum leaks to warping of parts of the engine. It is difficult to tell, but it sounds like it may have done some major damage. Sorry.

most flywheel faults are heat related caused by a slipping clutch . Remove the transmission and inspect for , blue color heat spots . small cracks. scores caused by a worn out driven plate, run out check with a dial gauge. most flywheels can be machined as good as new . All ways fit a new replacement clutch kit with a new throw out bearing.

Check your antifreeze if low it will cause the cars to blow cold air.
Most probable cause is blend doors getting stuck in open position I had that on my 03 Jeep GC dual climate common problem $2000.00 repair.
Good luck.

That can be caused by a number of things. It could be a bad engine coolant thermostat. It could be low engine coolant due to a leak. It could be a clogged-up heater core. It could be a bad water pump. It could be a blown head gasket....the problem needs to be diagnosed before anyone can tell you exactly WHY you have poor heat. (Although many may try to GUESS and tell you to just start replacing parts without any diagnosis.)

Not much information has been given by you but judging by what you have said the catylitic converter is plug therefore you will have to change it there is no other way to get around it. If the catvlitic converter is plugged it will cause the vehicle to heat up drastically. If it heats up too much it can cause severe engine damage. The best way to tell if it is plugged is to wait untill it gets dark outside and start your vehicle within about 2 minutes the catylitic converter will start to glow red hot. If this happens it is plugged and will have to be replaced.Do not let it run like this too long it will cause damage.

It is very difficult to test a clutch fan since they are activated by rotation and temperature. It is easier to replace it if it is seen as a possible cause for over heating. I'm assuming the radiator is not clogged due to age, and the thermostat was replaced or the head gasket is not an issue or possible cause for over heating.

You would see moisture around the head if it was leaking..........Over heating may be caused from an unservicable thermostat.......Hope this helps.

electrical problem with control panel or acuator or plugged heater core

check the fan on the radiator it should start before it over heats