Hello, Recently I removed the spare to attach my batt tender when I noticed some residual fluid streaking. I removed the cover to gain access and discovered the "wetness" beneath my heater valves, right side greater than left side. I started the car, turned on the vent switches and watched the fluid drip from the heater valve, minimal. Are these valves in anyway rebuildable? or are there replacements, ie bosch? Thanks very much.
When I first got my 328, mine leaked when I turned on the heater. They are NLA and as a result quite pricey IF you can find them. I drained the coolant out of the system as part of my major service and it was REALLY green. Not sure what the mixture ratio was, but I replaced it with much more water than coolant. I tried the heater again that winter and it worked without leaking. So I think the heater core was just really gummed up. I've never had a problem since. So you might check the heater core on the side that is leaking.
