Yeah mine passed all checks and compression is good. I have driven it for probably a year total with it going on. I swapped head gaskets in the middle of that though. I really don't see any negative affects on the performance of the truck, nor does it look like it's doing any harm over time. Just kind of annoying to know that I can't figure it out. Also mine has a new radiator on it because the mechanic thought the radiator had a blockage.
One thing I have been thinking about though, is the heater core. My heater seems to make the thumping worse and I think it could be possible that the heater core could be letting a little not of air in the system without losing a noticeable amount of coolant. Maybe the core has a hairline crack somewhere that is sealed when it's cold, but when it warms up, the crack expands. I haven't smelled any antifreeze in the air coming from the heater though, and that's a tell tale sign of a cracked heater core. See I just can't figure it out!
__________________
93 Splash 4.0 OHV V6 5 speed 4x4
|