Hi,

I took a look at the picture! That’s serious!
I wish I were more familiar with the 900 body but that leak is pretty far back from any coolant lines in the engine compartment. Leaks from in there are radiator line or the water pump.

This make me think that the leak is inside the car and under the carpets on the passenger side of the car.
I don’t know where the heater valve is located and how different the heating system is from a 240.
Pull the mats up and feel and sniff for antifreeze smell! Does the inside of the front windshield look or feel oily or smudged?
If the car is so clean, they may have polished that baby spotless!

You said the coolant tank is under pressure?
What was making that so noticeable or what does that mean to you?
In most cases the pressure is not that much and will be brief in duration, if released after an engine is shut down.

If the car had been just started and therefore has not generated any hot coolant, there’s no pressure right away. If it has then the engine most likely has a head gasket problem!
The twist on my thinking is the engine is running “Ok?” To you?
You need to check the spark plugs for any excessive cleanliness on one or more plugs? They get steam cleaned!

There is a “coolant block checker” tool that shoves onto the coolant tanks cap opening?
It holds a fluid that changes color in the presence of combustion gases passing up through the coolant.
The tool cost about $40US, but don’t invest in one as the fluid has to be kept fresh for it to work accurately!
Hunt for a shop that does lots of troubleshooting in this area and then you buy them their fluid over and over, but only once! (:-) 10-15 dollars, maybe?

I had my tool given to me for this very reason of keeping the fluid.
I have used it once on a coworkers car!
He bought the fluid, so I’m guessing on actual costs!
The in common co-employee gave me tool and of course, there must have been a string attached as he referred him to me! Today, they call it networking! (:) Know somebody, who knows somebody!

Sometimes, I think I’m just a big storage bin, as a few years ago, I found two chambers with one in a box with the instructions!

Jeez, I said to my self, how did that happen?
Forgetfulness, along with a very ENTICING Garage Sale, thats what! (:)
I have slowed down on doing that, along with many mechanics having passed on. (:(

These cars are inexpensive to maintain as mentioned in the thread!
Parts are laying around with some in package deals, that you found!
Probably why he is holding his price up!
Shop wisely or sell like he is doing!


Phil