Why is my Jaguar XJ8 heater not working?
While there are a variety of reasons your Jaguar XJ8 heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
How to diagnose a heater leak in a Jaguar?
1. Unbolt the Coolant/Water Expansion Tank, set it aside so it doesn’t block access to the Heater Valve. 2. Loosen the bolt that secures the Heater Valve to the car. 3. Rotate the Heater Valve to get access to its connector. Procedure A (This one is messy. We recommend that you do Procedure B instead.):
How does the heater on a Jaguar work?
Battery Voltage Supply Through A/C Isolate Relay Battery Voltage Supply Through A/C Isolate Relay Sensor 5-Volt Reference Voltage Sensor 5-Volt Reference Voltage Sensor 5-Volt Reference Voltage Battery Voltage Supply Face Vent Differential Temperature Control Face Vent Differential Temperature Control Aspirator Motor Aspirator Motor B1294 (.)
What causes a Jaguar climate control to fail?
When the Heater Valve becomes faulty, it begins to draw too much current, which causes the Climate Control Module to become damaged (i.e. failure due to over-current condition). 4. Harness/wiring problems between the Heater Valve and Climate Control Module. 5. Failure at one or more air mixing/blending flaps. 6. Or a combination of the above cases.
While there are a variety of reasons your Jaguar XJ8 heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
What kind of aircon system does a Jaguar XJ have?
The following refers to aircon systems fitted to Jaguar XJS, XJ Series 1,2,3 and will have some relevance to later cars. See also our R134a conversion mythbuster.
Where is the hot water heater on a Jaguar?
Replacement is very difficult! Situated in the engine bay, close to the bulkhead (firewall) with two coolant pipes and a small vacuum pipe, this shuts off hot water to the heater matrix when max cold is demanded. It can become stuck open or shut but is fairly easily replaced.
Where to put the air conditioner compressor on a JAG?
Several people, including Victor Naumann and Harry Trafford, have pointed out that a block of wood positioned between the V and the top of the radiator can be very helpful to hold the compressor forward and above its normal position while you’re working.