JAGUARE XJS AIR CONDITIONING PROBLEMS AND UPGRADES
Yet another valuable classic car with air con problems.
The following are a list of components which fail on this car .
1- Compressor ( the compressor on the XJS is GM A6 compressor and not designed to run on new gas), there is however a new light bodied replacement unit, which can be fitted to substitute the old unit with green seals to stand to 134a gas pressures. Do not waste your time in injecting sealers into this unit to seal the leaks, as this is a waste of time and money.
2- Condensers are well designed in material for these vehicles and should last far longer than any other car air conditioning condenser, but should it fail then replacements are available.
3- Evaporator situated inside the heater box could leak on these cars, and the removal and replacement or repair is probably the most expensive part of any air con repairs on the XJS.
4- Expansion valve blockage is a common problem given the age of the car, however, in replacing this unit situated at the firewall next to the suction hose requires some knowledge, in most cases garages without knowledge of the air conditioning system try to undo the suction hose to create space in undoing the expansion valve nuts, in doing so they rapture the copper pipe that suction hose fits into, and to repair the crack caused in the pipe, then the Dashboard/Heater box has to be removed. There is an easier way to do this without causing the customer to pay for mechanicís fault.
5- Receiver/Dryer blockage is another cause of poor or no cooling. This item is conveniently situated on top of the condenser and must be changed at every repair.
WHAT NEEDS TO BE ADDED TO UPGRADE THE SYSTEM INTO A WORKING SYSTEM.
Once the compressor, dryer and expansion valve has been changed , a Trinary pressure switch needs to be fitted into the high pressure side of the system, situated on the silencer side of the compressor discharge hose, once fitted it needs to be integrated into the compressor wiring and radiator electric fan, to ensure correct cooling of the system takes place, and system is shut down once the gas runs out, to protect the compressor.