Only does it on longer drives. Car has no coolant leaks. I know the temp gauge on these cars isn't accurate, but does not go past 1/2. I was told if there are no leaks, and water pump is fine, the thermostat is to blame. So I put a new, correct one in. Yes, I installed it correctly as well.

Any ideas are appreciated.

 

Tap on the fan control module under the car left fwd of wheel .

 

So the fan module is on the left side, forward of the wheel? For what it's worth, the fan will turn off after 5 minutes. I did notice that today, only one fan(the lower) was spinning after engine shutoff. In the past it was both.

 

If the fan or fans are eventually turning of by the module then the problem would be in the sensing of coolant temp or the coolant fluid itself may be abnormally high . The fans work as a single or both dependent on coolant temp sensing . You can remove and test the sensor in ice and boiling water

 

Awesome, thank you a ton for your help. I've been meaning to get some form of dataloging for this car. That way, I can see if it really does get hot. But yeah, I'll do this test.

 

Are you completely sure your water pump is actually fine?
Fans running after you've shut down is usually the first symptom of a bad water pump

 

It's not leaking, and service history shows it was replaced January 2013. But how would I know if the water pump is bad? I believe in diagnostics, so I am all ears.

Oh and I forgot to mention, car is a 2002 Sport.

 

An infrared thermometer can be used a a reference outside of the cars system of measurement as either the gauge or reading the engines databus through a ELM327 . If you go with the ELM327 you might be reading a bad value as the car's system is suspect . The using a plastic part as the target is not as good as the metal before the piping section .

https://www.harborfreight.com/infrar...ter-93984.html

Get the one with the software included . Although it is low quality software it gets you in cheap and you could get better software later .

Vgate ELM327 OBDII V1.5 USB Cable Laptop Car Vehicle Diagnostic Auto Scan Tool | eBay

 

The diagnosis is usually based on the fact the fans keep running...

If your pump was replaced with the older plastic style one, then it may be broken again. There are other things that could be faulty as well though, like your new thermostat, or a blocked radiator.

Unfortunately just because you've replaced a part doesn't mean it's working properly

 

I will put the old tstat in boiling water to see if it opens. If it does, I know the thermostat was never the problem. When I drained my coolant, it came out very clean. Looked newish. So I doubt the radiator is clogged, but you never know.

I did some research on the water pumps, and read mixed thoughts on using the metal or plastic ones. Don't know which one my car has. At the moment, I only drive my car very short distances. Don't want to kill the engine.

 

I tried getting an ohm reading off temp sensor. Can't get a reading on it. Yes I had the probes on each terminal of the sensor. I could see it visually. Got a voltage reading off the battery, so I know my multimeter works.

 

Which means you have an open sensor since the digital meter can't settle on a specific value as it keeps hunting for one . If you have a old school needle meter it can be read easier as a full observer left deflection . I use both types of meters as one is good at one thing while lacking in others . You can read the air inlet temp sensor to verify a valid test configuration with your meter in hand as they should read the same values . Sensor connector at rear of bank 1 charge air cooler.

https://www.jaguarclassicparts.com/u...s-4-0-litre-v8

 

Good stuff. I will get back at it tomorrow, and give you guys some updates.

 

Could be normal behavior. If the ambient temp is +85°F and I've been running the AC, the fans always run for a few minutes after shutdown. OBDII monitoring of the engine coolant temp shows 200°F regardless if the outside temperature is 90° or 40°, so I'm positive it's not an engine temp problem.

 

Yeah it was around that temp on Monday. Pretty cool today at 56°F. Should it still do it regardless of ambient temp? As I understand it, these cars do not like anything above 210°F?