Hello Jag Gurus,
I have for one week now been using my Jag series as daily driver in testing the car to detect other issues and fix.

I have noticed the engine overheats when in a long standing in traffic with engine on, once the engine overheats the engine suddenly dies and I have to wait for in the middle of the road for about 45 minutes for the engine to cool down before the car will start again to continue the journey.

What cause the overheating and how do I fix it to prevent it from happening again?

 

When the car is stuck in traffic there is little or no airflow through the radiator, so it will get hotter. On the RH side of the radiator is a thermal switch that controls an electric fan mounted in front of the radiator and A/C condenser. This fan should come on at approximately 90 degrees Celcius

It is likely that your electric fan is not working hence your engine overheats. If your electric fan is not coming on, you will need to troubleshoot it.

Start by checking the fuse and contacts in the small 5-way fusebox in the engine bay on the left inner wing. The same one mentioned in the other post where you are troubleshooting the headlamps.

if the fuse is ok, try the relay that it feeds to control the fan. This is normally mounted on the front cross panel above the radiator on the left hand side (but may be in a different location depending on options on the car). If the relay is ok then you might have a fault with the fan itself or the thermostatic switch in the radiator.

You can remove the connectors from the thermostatic switch and short them together to test if the fan works. If it does, then the fault must be the thermostatic swtich.

 

What are the use of the fuses at the passenger bay at front?

 

What are the use of the fuses at the passenger bay at front?
I tested them but none of them was have power to light the tester to show live power

 

1. Many cars like yours do all right without the auxilary fan. You may have other cooling system issues. Dirt between the AC condensor and the radiator core. Dirty internal core passages. Faulty viscous coupling to the mechanical fan. These need attention.

2. Try for a power source with the ignition switch on. That bank of fuses on the wing wall include those for the head lamps. Do they light up ? You really need Jaguar Schematic S57 to understand the circuitry.

3. Simply roll the fuses in their cradle. Improves contact.

4. Use you VOM to check continuity of each fuse. . These glass fuses may appear good, but be open internaly!!!


Good luck with the eectrickery...

Gotta put my senior Jeep on the charger. Long periods of inactivity. Battery to low to crank,
Just get the relay ratttle...

Carl