Leadfoot:

Gurgling in the heater core means all the air isn't bleed out since the last time the coolant was changed OR you have a leak.

Coolant dripping from the evaporator case is also a sign of a leak. In severe cases you will get steam coming out the vents with a warm engine on a cold day! You will also get slime on the windows from the glycol.

Check the system for pressure holding ability, the pressure caps fail with age. This leads to loss of coolant and gurgling heater core. A pressure test will tell you for sure.

Changing the heater core on this car is quite a bit of work.

Larry:

I forgot about on sticking open.

Peter

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!