I found out why my alternator belts were slipping. The thermostat seal is leaking and coolant must have been getting onto the belts.

I have new belts installed and am ready to go except for this

Do I have to drain the coolant in order to take off the thermostat housing? It seems quite high up, but I don't want to spill - I am working in my garage!

Just waiting for call to see if dealer has a gasket. Otherwise, maybe some permatex would work? Tried tightening bolts and bubbles of AF oozed out of joint!

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5