I have a 2003 Montana van with 160K miles. The Van wants to overheat, first occasionally and now quite often, the temp will begin rising, (sometimes it will reach the point where the temp warning lite comes on) the heater will begin to blow cold air. I took out the thermostat and it did the same thing. I flushed it out, still overheats. The first time it overheated was about 5 weeks ago, we put in a new thermostat which seemed to solve the problem, but about a month later it started acting up again.
Sounds like a leaking head gasket
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I am thinking you either have a lower radiator hose collapsing, a water pump problem, or the radiator is corroded. At anytime the van overheats, I would be certain to replace the thermostat. Do you have electric fans, or is the radiator fan driven off the the fan belts? If electric, I would be concerned that they are not operating when the engine temperature is excessive. If powered from the fan belts, have you replaced the fan clutch?
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