I have a 1999 S70 and for the past two weeks I have to refill the coolant tank about every 2-3 days.

Does anyone have any suggestions as to what and where to check for where it can be leaking?

I have an appointment at Volvo on Saturday but if I can resolve it before than it would be great.

Thanks!

In addition to Klaus' recommendation...check the supply line coming off of the bottom of the resivoir too. If your's is like mine on my 2000 C70 there is a metal insert inside of the nipple..which was ever so slightly cracked and not visible to the naked eye...but when pressure tested was leaking...the replacement tank was very inexpensive from Groton FCP...I also replaced the float sensor at the same time too...

Frank
88 760T, 303,000 miles
00 C70, 100,000 miles

Just had this issue on my 850 which (super lucky) turned out to be the overflow hose at the thermostat...it wasn't quite tight enough.

Just check around and see if you can find any coolant...if you find just a drop, that's probably the spot, as it often burns off or drips away.

Nate
--
1997 850, 1979 242GT, 1990 740GL

Heater core is an easy DIY replace, so check the carpeting around the center glove box for dampness.
Check the filler cap for cracks and the line from the bottle to the engine for drips.
Check the radiator, usually on the right hand side for residue.

Klaus
--
The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)