Hello All,

Perhaps you can help me out. If I drive my cat 2002 X Type 3.0 Automatic 148 K Miles)o n a hot day 80 F degrees outside in Chicago or Indiana you can see the temperature gauge on the dash NOT Stay in the middle between hot and cold. but start to head over to the red over heating this tends to happen in crawl speed and on very hot day traffic on the expressway. The Dash will display a warning overheating and then the fans will NO LONGER turn on. I took my Cat to the auto mechanics.. They replaced the Thermostat and the Evaporation tank which had a slight dripping hole and checked for leaks. I connected my ODB2 Scanner only code that comes up is a 02 Sensor bank 2 I replaced it with a new Bosch 02 and replaced all new 6 spark plugs , New fuel pump, New oil pan gasket, 2 new blend door actuators, I gave it a radiator flush a fresh oil change. I checked the fuses and fan relay's and they tested ok when I play switch around game. The battery terminal look nice and snug. The mechanics shops say they don't really work on Jag's here I think if the error does not come up on the scanner they will not care.

I'm sad to say that the problem still exist. the air conditioning works but the air is cool not cold. and the engine cooling fans work. The defrost rear and front. work (if I let the car cool back down about 1 hour later then the fans will turn on automatically and run as if nothing ever happened.

One thing that leaves me to hints me to believe its a grounding issue that the JVW 230BT DVD car radio's USB Charger fluctuates for example if cell phone is connected will flash charging /not charging / charging not charging/ so I think its electrical.
My rear speakers stopped working. This problem existed even when the factory radio was in place. I also replaced all abs sensors and all catalytic convertors, starter , cabin filters, air filters and knock sensors.

I'm starting to think its one of 5 things :
1. a faulty intercooler module
2. a faulty radiator
3. a faulty water pump and or belt.
4. a electrical grounding issue - that happens only once it get very hot.
5. a bad alternator.

ANY Helpful thoughts or tips would be greatly apricated

Please help thanks!

 

One check is measuring the temperature at the inlet to the radiator and the outlet. If you have one of those non-contact thermometers it is perfect. With the engine warmed up and the thermostat and fans working properly the radiator outlet should be about 10 degrees C cooler than the inlet. Make sure you are pointing the thermometer at the same thing. Point it at the hose on the inlet and the outlet or point it at the radiator very close to the hose. Do not compare measurements of radiator on one side vs a hose temperature on the other. And measure a few times, I am talking about average temperature change.

If the outlet is nearly the same as the inlet one possibility is the radiator is bad, not enough heat is getting transferred to the air because some tubes are blocked or fins are clogged. If the outlet is much cooler than the inlet it is possible there is not enough flow rate so bad water pump or bad thermostat or some blockage in the system is not allowing "enough" coolant to cool down to keep the engine cool.

As far as bad grounds, definitely check and clean the grounds for the fan motors and fan ECU.

 

Hello dh53,
I have spoken to my neighborhood shop mechanic.
I will buy a new water pump, belt, radiator, ambient temperature sensor , intercooler module and radiator hose.
He will install t all at once as instructed. All of these parts at once. My Cat already has a new thermostat and starter.
Also with the information you provided it sounds like It could be the radiator as the main culprit.
I plan on literally replacing and every major part / sensor that is 20 years old within a years time frame.

I will send out an update with the results when done.

Thank you for your responses they sure do help out!
Kind regards,
RM

 

Hello dh53,
I have spoken to my neighborhood shop mechanic.
I will buy a new water pump, belt, radiator, ambient temperature sensor , intercooler module and radiator hose.
He will install t all at once as instructed. All of these parts at once. My Cat already has a new thermostat and starter.
Also with the information you provided it sounds like It could be the radiator as the main culprit.
I plan on literally replacing and every major part / sensor that is 20 years old within a years time frame.

I will send out an update with the results when done.

Thank you for your responses they sure do help out!
Kind regards,
RM

 

Are both fans running?

With the 2002 model you should normally have the old fan assembly with old CFM (cooling fan module) with cables.
Carefully look for loose contacts in the connectors. (But even with the new fan assembly / CFM.)

When you are advanced, and own a scope, you can investigate the (PWM) control line from ECU to CFM.
A very quick method to see if ECU demands high or low cooling. If high demand, and fans ar not running, the defect is at CFM, cabling or fans.

It's the white-blue wire, perhaps easily accesible at a connector below the coolant expansion tank.
The CFM delivers 12V and the ECU switches it to ground (PWM).

like this:
duty-cycle about 97% to 100% -> full speed
duty-cycle mostly high -> higher speed
duty-cycle mostly low -> lower speed
duty-cycle 0 to about 3% (or short to ground) -> full speed

If you only own a voltmeter you can see high duty-cycle with for example 7 to 14V at display, and low duty-cycle with for example 3 to 6V.


catfondler

 

Don't use the parts shotgun!

One of your interests: waterpump is so easy to remove for a check.
Remove battery box, air filter case, and drive pulley.
But more easy is to check the water pressure in a suitable place.


catfondler

 

Just a word of caution from my experience; Tackle one issue at a time. in your case the most pressing issue is the possibility of overheating. Before I would do anything else I would confirm that the car is actually getting hot by measuring the coolant temperature with a mechanical gauge or as dh53 suggested a non-contact (infrared) thermometer. We took our '08 out last Sunday doing alot of stop and go driving for over an hour here Las Vegas, the outside temperature was 108F, the temp gauge never budged past where it normally sits year round (a smidge to the left of center).

 

I will buy a non contact thermometer and thanks for you great message.

 

Nice Jag !

 

Hi everyone it turned out to be the radiator! i have a new one now works fine no more over heating !!

 

Sorry to drift off topic, but can I ask where you got the new catalytic converters from, I am having trouble sourcing them over here in Europe, thanks.

 

Hello Norcat,

My Mechanic ordered from a vendor in the US Chicago Land Area.

That is all I know I usually buy my parts from partsgeek.com I see them there.

Good Luck.

RM

 

Britain =

https://www.1stchoice.co.uk/car-part...ytic-converter

https://www.motor-doctor.co.uk/catal...ype/x-type-cf1