Mud in my Veins
Join Date: Dec 2000
Location: Memphis, TN
Thanked 0 Times in 0 Posts
It could still be the thermostat - I've bought bad new ones. How old are the radiator hoses? How old is the radiator cap? How old is the radiator coolant? How much antifreeze is in it? Does it look rusty or otherwise opaque? Have you ever backflushed or flow tested the radiator? Ever changed the water pump?
IMO, the most likely causes are (in order): cap, thermostat, radiator, water pump. (Coincidentally, that's also easiest to hardest![img]images/icons/wink.gif[/img])