Here we go with another problem...driving home from work and the low coolant warning comes on. I pull over and there is still coolant but it is low. When I got the car in November last year it was doing this and the dealer changed the radiator, water pump and the coolant tank.

Put some more coolant in tomorrow and see if there is a leak.

Do these cars some how burn off coolant?

 

No they don't.

 

The plastic thermostat housing assembly is another common culprit. A pressure tester is the standard way to find leaks.

 

Thats what it is. The guy working on my car could not find the part number though and I posted a thread with the pic because when he did a search for thermostat housing nothing came up. About an hour after I posted the pic he did a google image search and found it.

Its actually a long name and hopefully it will be fixed tomorrow.

 

A word of caution about the plastic cooling system parts on these cars.

THEY SUCK.

They crack very easily even when the car isn't old with a lot of miles. So when having work done on the car remind your mechanic to be very careful around those parts. Just bumping into the tanks connection pipes too far will generate a crack. I use a bit of silicone grease on all my coolant fittings so that installation/removal doesn't stress things on the crappy plastic stuff and it helps to prevent dead eddy pocket corrosion near hose clamps on the fittings when it's metal.

 

Good info thank you.

It is now fixed as it was the thermostat housing which had cracked. I got lucky with this mechanic. He is a buddy of a co-worker and he is the mechanic for a security patrol company. They have a full auto garage and his boss lets him work on cars on his own time.

I really like this guy because he literally started looking up and reading on the Jag S-type absorbing what he could. He is going to be doing some work on her for free just parts so he can learn about the engine. He is going to join the forums soon. The good thing he is not an ego maniac about being a mechanic. He came from the school of experience and school taught.

 

It's great you reported back with a successful repair! We often don't hear anything and we don't know what happened.
.
.
.