Re: Well, it's not the water pump........

[derf <derf247@gmail.com>]

If I were you I would pull the hood off and drive around for a minute
or two with a makeshift radiator and no fan to see what happens when
you hit that sort of bump.
Is the rad moving back?  Is the motor moving forward?  Something aint right.
Is the radiator support bolted in properly?

You can sometimes temporarily "patch" a damged radiator by crimping
off the damaged passages.  Just squeeze them with needle nose or vice
grips to block the flow in the damaged areas.