Hello everyone:
I still can't get over what temperature should your jag be. I'm in Texas with the outside temp at 96. I keep looking down at my CabrioBob temp and volts meter. My temp reads anywhere from 202 to 212. Should I be worried? What could make it run hot? Could it be the thermostat? There are no leaks anywhere. Or just tell me don't worry and drive it. The volts read anywhere from 13.5 to 12.9. Bad Battery? orrrrrrrr
just quit worrying and just drive it. Thanks for all your comments.

JDog

 

The thermostat is what...... 210? Therefore the thermostat would keep the coolant near that temp even if 35 fahrenheit ambient.
210 is nothing to worry about, it'll go down a bit once you get it moving and create some airflow anyway.
220 now, start watching real close and prepare to shut down if it get much hotter.

 

If your car begins to overheat, turn on your heater to maximum heat and fan speed until you can find a safe place to stop and shut off the engine. Your heater is another radiator and can help cool down the engine, assuming that you haven't lost all of the coolant.

 

yeah if you think about it, knowing the boiling point of water is 212F, that's what you might be naturally worried about. but your coolant isn't just water, and it's under pressure, so it can't just up and boil as normally as an uncovered pot of water does. coolant resists both boiling and freezing, so a 50/50 mix gives you some protection there. the car will slap you with a big red triangle when you have low coolant or are over temp, those sensors do not commonly fail, so i would say don't worry.

when driving your volt meter is not reading the battery alone. the alternator is also on that circuit. that's a healthy alternator, cranking away at 13.9V to run electric systems and keep the battery from discharging. nothing to worry about there at all.

 

With ambient temp = 96F, seeing engine temps of 202-212F is normal, especially at idle. On the highway you should see somewhere around 195-198?

If your fan is working, and no loss of coolant, you shouldn't 'lose your cool' over it =]

 

I'm just north of you by a state and see the same temps on my ADU at the same ambient temps. I'm pretty sure my voltages are higher, but I don't watch that as closely as the temp, so it may be the same but I haven't noticed. I'm probably going for a drive tomorrow morning and will try to look at mine.

 

not in houston, bless their hearts.

 

JDog, with the heat we have had this Summer, mine is running between 202 and 215 in traffic. I have seen it as high as 218 when I got hung up in traffic out by IAH at 4:00 PM. As soon as I get moving, it will cool down to 197. Runs cooler in the Winter. I too am using the CabrioBob display.

 

Jack:
What is your voltage reading during the time in traffic and on the highway. My jag is showing 13.1 during both traffic and highway. I am not worrying so much about the temp any more but the voltage makes me thing about the alternator or battery. Thanks

Joe

 

I remember purchasing my coolant directly from Jaguar (super expensive!) Shouldn't I be adding it directly without any 50/50 mixture with distilled water?

 

oh no i don't mean to imply you did anything wrong! they probably gave you a 50/50 premix. if not, the directions would say to mix with equal parts distilled water, resulting in such a mix.

what i mean is what you end up with in the car, one way or another so long as its done right, is not plain water, thus does not boil at 212F or even 220F. some coolants go way, way higher than that! thus a fluid mixture will definitely boil somewhere in-between, and may partially boil if there is local separation (i forget what that's called) and a very hot pocket of water coalesces... but this basically does not happen under normal use.

here's a quick google search result for posterity: https://www.evanscoolant.com/how-it-...o-overheating/ it states a typical mix raises the boiling point to 223F but most of the stuff for performance vehicles i would wager will go to like 235F. nonetheless that's why you should be concerned at 220F, that's a good safe number to treat as the beginning of the danger zone.

 

Mine idles at 196-198F

 

What is the voltage reading at idle and around 60 mph?

JDog

 

My ADU showed between 14.4V and 14.1 volts over my short multi stop drive this weekend. This was when idling or at speed. It did not vary much between idling or highway speed. I did not have the chance to go for a longer run to see if it would drop after an extended highway run.

 

My jag is reading is reading 13.1 to 12.9 at idle and at 60mph, what could be the reason for showing the low voltage. I know it could be the battery. I keep it on a charger all the time when parked. Should I just wait until a battery light comes on to address this? Or I guess I need to take the car, and have the battery and alternator checked. Any input from my brothers and sisters of my Jag family? Thanks

Joe

 

My 2014 shows the same readings as yours JDog. I too thought I had a problem, but I think the low reading may have something to do with the Battery Management System (BMS) on the later models. I switched to a new AGM battery over the winter, not because I experienced any problems, but because my battery was 5 years old. Before switching my standard battery displayed the same readings. I also thought the low readings may be attributed to having the car on a battery maintainer all the time. However, because I drive my in the summer every week I don't use the the battery maintainer and the voltage readings are the same. I optioned for the AGM battery over replacing same wet battery because my car is a convertible and I have a remote control module installed for the windows and top which would be taxing on the battery if used regularly. I hope this helps.

 

JDog,
Besides the ADU in the Jag, I run a radar detector that displays battery voltage in my 3 other vehicles (all Ford products). The only time I see voltage less than 13v was when the engine is off or I had a bad alternator.
As far as I’m concerned, a working charging system should be putting 13V + into a battery.
I’d be thinking about truly testing the battery outside of the car and then testing the rest of the charging system.

 

On the 2010's and newer read up on the battery monitoring system. After so many cycles it goes into a drain cycle which takes the battery down to 12 volts. Also the primary function of the alternator is to maintain a necessary voltage to keep all of the car functions running. The secondary function is to put a controlled charge into the battery. The system does not need to produce 13 - 14 volts all of the time. If you see less then 12.6 V then check for problems. Read this part in the service manual.

 

Thanks everyone for their input.


Joe

 

My XKR idles at 11.4 and goes up to as high as 13.4 while driving. It reaches 13.4 at higher rpms with foot off throttle only. I picked up a cigarette lighter plug in with USB and voltage display and it reads exactly the same as the ADU receiving data from the OBD2. Everything works beautifully and I'm not using a battery maintainer anymore because I'm driving the car at least 2-3 times a week. I also have a new AGM battery which I installed over the winter; however, the voltage reading with the new battery is the same as the 5 year old I replaced--replaced only because of age. Do I have a problem?

Still loving the C8 jagtoes? I'm still on the wait list for a C8 Z06.