Jaguar XJ6 / XJ12 Series 3
XJ6 S3 · 1979-1992Faults written up for this generation: likely causes and the order to check them in.
-
9
Jaguar XJ6 Series 3 Air Conditioning Problems
On the Series 3 it's usually one of two things: a slow leak, after which the compressor protection keeps the clutch off, or a broken 12 V feed to the clutch — an oily…
-
6
Jaguar XJ6 Series 3 Alternator Not Charging
On the Series 3 it usually ends at the alternator — a worn diode pack, brushes or regulator, cured by a good rebuild or a replacement.
-
3
Jaguar XJ6 Series 3 Battery Drain, Flat After a Week
Measure before you guess: an ammeter between the negative post and its clamp says whether anything is drawing and roughly what. About 20–35 mA is normal.
-
7
Jaguar XJ6 Series 3 Blower Motor Not Working
When both blowers on a Series 3 stop together, it's almost always the supply, not the motors: the 50 A fan fuse or its holder, then the climate feed fuses, an earth…
-
5
Jaguar XJ6 Series 3 Central Locking Not Working
On a Series 3 dead central locking is most often a blown locking fuse, a sticky or failing control unit in the driver's door, or one door whose linkage has seized.
-
10
Jaguar XJ6 Series 3 Won't Start, Cranks But Won't Fire
On the Series 3 the fuel pump doesn't run with the key on — only while you crank, so silence at key-on proves nothing.
-
4
Jaguar XJ6 Series 3 Fuel Tank Switch, Changeover Valve
On the Series 3 the pump draws from whichever tank the changeover valve selects, and the return valves send spill fuel back to the tank shown on the switch.
-
6
Jaguar XJ6 Series 3 Heater Not Working
When a Series 3 blows cold air with the fans running, I'd look at the heater water valve on the bulkhead first — it seizes shut after decades.
-
5
Jaguar XJ6 Series 3 Misfire, Rough Running
When a Series 3 runs on half its cylinders, it is usually one cylinder or one group of injectors, not the ignition.
-
12
Jaguar XJ6 Series 3 Overheating, Losing Coolant
When a Series 3 runs hot in traffic, I'd start with the small aux fan in front of the radiator — join the radiator switch leads and see if it runs.
-
4
Jaguar XJ6 Series 3 Power Antenna Broken or Stuck
On the Series 3 saloon the aerial motor sits in the boot by the spare wheel, pushing the mast behind the right tail lamp through a long flexible conduit.
-
1
Jaguar XJ6 Series 3 Radio Code Refused
Late Series 3 cars have a Jaguar security radio that shows CODE after the battery has been off. After a few wrong tries it refuses even the correct code.
-
3
Jaguar XJ6 Series 3 Radio Not Working
The Series 3 radio is fed through two inline fuses hidden in the console, not only the main fuse box — I'd check those first.
-
8
Jaguar XJ6 Series 3 Turn Signals, Indicators Not Working
On the Series 3 the indicator feed passes through the hazard switch even in normal use, so dead indicators with working hazards usually mean dirty hazard-switch contacts…
-
5
Jaguar XJ6 Series 3 Window Switch, Windows Not Working
When every window on a Series 3 stops at once, check the small master switch on the centre console first — it is easily knocked off.
-
8
Jaguar XJ6 Series 3 Won't Crank, Just a Click
On the Series 3 the key doesn't feed the starter — it pulls in a relay on the bulkhead, which needs the gearbox switch in Park or Neutral and power from the firewall…