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Old 06-24-2013, 06:58 PM
blkwdw86 blkwdw86 is offline
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A number of things it could be. And when you stop the truck, your temp will naturally rise as the heat from the block heats up the now not circulating coolant, it's normal.

If your truck overheats quickly when you start out, your water pump is toast. The engine superheats the coolant around the cylinders without the circulation needed to move it away and replace it with cooler coolant from the radiator. This is usually accompanied by a bubbling/boiling sound.

A blown head gasket will also cause your truck to overheat with similar symptoms, do a compression test.

If it overheats after a reasonable amount of driving, it's possible your radiator is plugged, have it cleaned or replaced.

What type of coolant is in it has an effect, too. Rams use a HOAT (Hybrid Organic Additive Technology) long-life coolant. Use of other types of coolant WILL affect the efficiency of your cooling system. I use Zerex G-05 coolant, available at NAPA for about $16 a gallon. Expensive, but necessary (everything for these trucks is expensive). If you're not using a HOAT type coolant or aren't sure what's in it, after you do any repairs necessary, drain and flush your cooling system with distilled water (no minerals in it) and refill with the proper coolant. Your truck will be MUCH happier with it.
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