my V6 would start to bubble into the overflow tank... i was getting worried, BUT, the engine was OFF.. and it continued to boil over into the overflow tank! Replaced the cap (with pressure release just for grins) and haven't had a problem since! I know the seal was starting to rot, and probly the spring get weak.. so it would bubble.. even with the engine off.

94runner: Dana 44 SAS, 35's, Lockers, gears, winch, rock rails, bumpers, 3"BL, drivetrain lift, Budbuilt cross member, centerforce clutch and MORE! ***FOR SALE*** $8,500
-1985 Supra (STOCK!) FOR SALE $4,000
www.celicasupra.com