That is a lot of money! I’m sure there are breakers near you that could provide a used one but it would need to be check before installation. Check this forum’s market place as there are cars being parted out and there may be one near you
Otherwise maybe you can find or borrow a cheap similar sized radiator from a different car and cobble some hosing together to see if will cool the motor. Maybe use clear hose To the temporary radiator to see the coolant flow
Is there a radiator repair shop near you? They should be able to test your current radiator to determine if it is blocked and maybe repair it. They may have cheaper Non- OEM replacements as well. Give them a call and get an opinion on your problem at least.

Keep us posted.

 

Forum members who have worked on the thermostat may know this. Is there a jiggle valve or vent hole/notch in the thermostat such that Chibbi's thermostat is installed up side down? This could trap air in the system. Maybe try rotating the thermostat 180 degrees.
My experience on other cars is the vent goes up (12 o'clock) as air in the system would rise and help purge the cooling system. However, I did read in a Toyota 4-Runner truck forum that, in that application, the toyota thermostat vent goes at 6 o'clock which indeed made a significant temperature reduction. https://www.toyota-4runner.org/3rd-g...ifference.html
Thermostat orientation isn't mentioned in the service manual and the thermostat appears to kind of screw into the housing so it may self orient.

 

See post 14. She can use that to check flow by pointing.

 

I am back with more information and I guess I have found the problem.

But lets start at the beginning.
I have checked the last part which was not replaced - the radiator. I thought it would be polluted maybe. So I bought a cleaner and flushed the radiator with a normal water pump. This water pump was used to pump water from the river into the garden and water the flowers.
The water from the radiator outlet was clean so the radiator was not the problem.



Because of that I removed the thermostat to see if the water pump pumps enough water through the system. I have removed the thermostat from the housing and I have recognized that the bolt (check the photo of an original jaguar thermostat) was missing. So our JLR dealer has sold us an original thermostat where the main part to function properly was missing



Additionally my husband has forgotten the big spring while assembling the thermostat. Because of that the water pump could "open" the thermostat with higher engine speed because the pressure inside of the cooling system was high enough to press against the small spring. He has assembled a kind of back-pressure valve




My next step will be ordering a new thermostat with all parts then assemble it. I have made a picture just to check with you guys because the jaguar workshop manual does not provide that much details about assembling the thermostat

 

If it's me, I'd rake the dealership over the coals, not mention the miss by your husband and

1) see if they will install it given the amount of time and money you've spent,
2) barring that, see if you can finagle a few oil changes out of them.

 

Glad its sorted... but don't feel bad. The multi part thermostat confuses many, the first time.

 

The new thermostat arrived today :-)

The bolt is not missing. It is not possible to remove the bolt so I am wondering why the one from the old thermostat was missing.

Maybe someone bought it and wanted to test it with hot water outside of the housing. So the bolt would be pressed out of the thermostat, he recognized that and returned it to the JLR dealer.
The dealer sold us then the broken thermostat.
I do not have another explanation for this.

Anyway I will install it and then testdrive the car. The weather is really hot outside, perfect conditions to test this :-)

 

If I may piggyback a question onto this informative thread --and hopefully take advantage of the knowledge here-- I had my first overheating problem TODAY. So:

- 2010 XKR, 80K miles.
- had water pump replaced (and new coolant) at about 70K miles at dealer.
- have had the car for six years, never had any issues of this type whatsoever. The dealer rather kindly replaced the water pump (which had been beginning to leak) under warranty so it was at no cost to me. But I'd had no issues with it prior.
- recently drove across the country, about 700 miles/day,much at high speed in hot temps. A/C on all the time. No issues.
- when I returned to LA (and started doing more shorter trips) noticed that the A/C would go off (not the fan, the car would just start getting warmer). I'd turn off the A/C in the climate control panel, then immediately turn it back on. Car would then cool down fine.
- today: VERY HOT day in LA. Was in traffic, moving slowly... noticed the car getting warmer... got the YELLOW "overheating" warning, then after about 30 seconds, the RED overheating warning.
- I immediately turned off the A/C, turned the heat up all the way (good times!), pulled off the freeway and pulled over, but did not shut off the engine. After maybe a minute, the warning went off. Figured the best course of action was to return home, (about 5 miles, stop-and-go), which I did without incident. Kept the A/C off.
- that was about an hour ago. It's a black car, and it's in the sun, and it's 100 degrees outside, so of course the car is still hot. Haven't checked anything yet.

How worried should I be? Any concern wiht long term damage? The soonest I can get my car into service is next Friday. Is it OK until then?
Thanks as always...

 

Sitting for a week or two won’t matter. Myself, I would flat bed it in. It is peculiar an engine would start overheating if there were no changes to the system. Need to ask, is the correct coolant being used and is the reservoir filled? I always change all fluids in an accelerated frequency then described in the manuals.

 

Yep. Checked the coolant level, looks good. And coolant was flushed when they replaced the water pump. I need to drive the car this weekend is the thing.

 

A good thing you didn't lose any coolant. I guess you have to ask yourself if you're driving the car this weekend, will it be under the same circumstances as when the issue occurred (stop/go, outdoor temp) and can you get back home if the same thing happens?

 

It's supposed to be 116*F this weekend in Los Angeles, so I wouldn't be driving around a car with a cooling system problem that has already presented itself. This would really be a trial by fire. Rent a car and get this issue straightened out before you burn up your engine.

 

Welp - I'm staying with a friend in the valley and had to go over the hill to hollywood. It's about 12 miles, streets to highway to streets. (And for those who don't know, it was about 110 today in Los Angeles)
All fine on the way over. Parked, car stopped for about 20 mins.
Headed back.... on the way up the 101 hill (after about 10 mins of the usual stop-n-slow traffic in Hollywood), got the yellow warning, then the red warning. At this point nothing to do but kill the A/C, blow hot air, and ease it over the hill. I'm driving like 55 at this point. The MINUTE I crest the hill and start coasting down the other side (I'm at about 65 now), the warning light goes away. Light traffic so I speed up to 70. As a test, turn on the A/C and continue the 10 minutes I've got left. AC worked fine, didn't see any warning lights at all for the remainder of the trip.
Still no leaking puddles of fluid, no steam, nothing like that.
DETAIL: never once heard a radiator cooling fan, or the like. I'd assume a fan would be blasting even after I turned the car off, but no. So I assume some motor or module is fried, and I'm hoping that's all it is. Red warning light was on for about 3-4 minutes so I'm hoping that wasn't long enough to do any damage to the engine. Sounded and ran fine all the way back.
QUESTION: I noticed that on the drive to Hollywood, the AC would go on for a few seconds, then cut out, then try again, etc. Is this linked to temp somehow, like it cuts out if operating temp gets too hot?
Anyway, not gonna push my luck - no more driving the car. I'll wait til a cooler day to get her to the shop, which is mostly freeway. I'll keep y'all posted.
And thanks as always for any suggestions. Much appreciated.

 

A/C will turn off when temperature is too high. Had it happen to mine years ago. Sounds like your fans are not turning on, could be module, short, or ??? Not a good idea driving around in the valley at this time of year without a good cooling system.

 

Agree with this. I have just had to replace the thermostat sensor to fix these symptoms..

 

This is an interesting and informative thread. Does anyone know if the 2008 model 4.2 supercharged car has electric cooling fans, supplementary or otherwise? I ask because I have never heard any electric fans switch on in my car. On other cars I have had, the fans would turn on in traffic to provide additional cooling and would often run for a while after the engine had been turned off. Never had either in my XKR. I don't have any overheating issues by the way.

I just did a 2,000 mile round trip from the UK to the South of France, where the temperature was 35 to 40 degrees C (95 to 104F) and there were no issues, although the temperature did creep up a few degrees if I was stationary, but I expected that to happen.

As you can guess, I am no mechanic! Just wondering if I should sometimes hear an electric cooling fan kick in.

 

My car has rarely had the auxillary fans stay on after shutting down the car, but yesterday, after picking someone up in Torrance, driving through Santa Monica and up through Malibu on a bumper to bumper Pacific Coast Highway, when coming back to the San Fernando Valley and getting home, my fans were running full blast after I stopped the car. Of course, it was 124*F in the Valley at the time, and my A/C was working quite diligently, so I'll give it some slack. 124*F at about 3pm, we were eating lunch outdoors in Sherman Oaks, and boy it was hot.

 

This would explain why I have never heard my aux fans then - I doubt if it has ever gotten that hot here in the UK.

 

In case you want the dealer pricing on this. FYI, as someone pointed out elsewhere - the module that turns on the cooling fan is embedded in the motor, which is part of the fan and shroud assembly. $1,080 for that alone.
Thank GOD my warranty covered it....