Rover Celeste Coolant Loss!

Maintenance/Repairs
1

My 1999 Rover Celeste is losing coolant. Over a long trip the loss is minimal but on short (5 miles one-way) trips the loss is significant. The mechanic who usually takes care of my car says he’s pressure-checked it and can’t find the leak/loss. I’ve even thought of dumping one of those cans of fix-a-leak into the radiator but wanted to ask my questions first.

Second question, same vehicle: The rear parking sensors are currently out of service and I get the 7-second tone that means there’s a problem. When it went out it came back into function for 1-2 days, then out, then in for a few hours and now it’s out for good. Is there a cable or fuse that needs replacing?

Thanks for your help! (Rover alone isn’t on your list; just Land Rover and models)

2

More than once I’ve seen a water pump leak intermittently.
Start the motor cold and watch closely for drips as it warms up.

3

Did your mechanic check the coolant for evidence of hydrocarbons?
Did your mechanic try a UV sensive dye to find the leak?
And, as Circuitsmith said, a water pump can leak at the shaft seal only when the shaft is turning. This won’t always show up on a standard pressure test. The UV dye would, however, show it.

I’m not at all familiar with these backing systems, but your owner’s manual should tel you if there’s a fuse.