Rad Question

[Mark Milotay <mark.milotay@onthemark.bc.ca>]

Hi Guys,

I replaced the thermostat on my Spit on the weekend, and now the
temperature guage quickly climbs up towards the danger zone (w/in minutes
of starting). I know that one of the tests for a failed rad is to check and
see if the top is warm and the bottom is still cool. What I am wondering is
how long should the car run for this test to be valid? I want to make sure
that the rad is really dead before having to replace it. 

Thanks,

Mark and his Hot Spit