We had a Dodge van come into our dealership with the exact same problem you are
describing. I can't remember exactly what was wrong with it. I'll have to ask
the tech that worked on it the next time I see him. I'm pretty sure the radiator
was clogged up though. Just enough to prevent proper flow of the coolant.
Coolant would come out looking clean, and there would be plenty of it. Finally
ended up just pulling the radiator and sending it to a shop for them to check out
before we came up with the answer.
ABeerCan@aol.com wrote:
> OK, this is kinda weird. I know that usually when an auto acts up like mine
> is, then it runs just fine on the interstate or when moving along, but heats
> up when stopped at a red light. Mine is just bass-ackwards as it can be. In
> town it is fine, on the interstate, after about 4 or 5 miles, it starts to
> warm up. I just changed the t-stat, it is a 180. Water pump is new, along
> with hoses and a large three row radiator. I run 65/45 prestone/water.
> After it gets hot, like around 215 to 220, I turn off the ac, drive about 5
> more miles and it cools back down. Then it is just fine unless I get down on
> it. The oil is clean Mobil 1, the coolant doesn't show any signs of oil, so
> I believe the head gaskets are fine. Any ideas? It has been fine the past
> three summers since I hopped up the V-6 in it. Thanks for any help.
>
> Will
> Cylindrically Challenged V-6
> 10.75:1 comp (nom) w/ gaskets - 10.64:1
> extrude honed heads, roller rockers, extrude honed intake, polished and bored
> TB
> K&N in a ram air box (www.ramairbox.com p.n. 14x4@110)
> Custom full length headers Jet Hot Coated, Flowmaster Duals, Clevite 77
> bearings
> MSD 6AL, Champion Truck plugs p.n. 4071, NOS 180 shot (custom made plate)
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