amowry

90 l98 surge tank level drops coolant overflow tank level does not change no vacuum pressure tested 16# held all night dropped hush panel no sign of coolant no coolant smell out of exhaust no warter on oil dipstick no fogging window no leaks on floor thank you for any help will pressure test again #7 plug fouled bad head gasket

Loopidoo

How much are you loosing ? Could go out exhaust and not smell if small amount. I had a leak on rad and didnt know it till i pulled it out, so small it never hit ground.

amowry

thanks for reply I am starting to think pinhole leak under pressure loss depends on miles but the coolant overflow tank never changes level