Overheats at low speed, 2500 V-10
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#5
yeah, the over-the-counter chemical flushes they sell today are basically useless. They are 'de-scalers', and that's about it. They don't really break up any of the crap that accumulates in the cooling system, and, they rely on flow to do even that. If there isn't any flow in one area, the chemicals do nothing.
Say "Thank You EPA."
Say "Thank You EPA."
#7
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#8
If this is a high mileage truck, I'd be looking at replacing the water pump. It's not uncommon for the water pump fins to wear down to the point where water flow through the motor is severely reduced. This is likely why it cools off at higher revs going down the highway, so radiator sounds fine to me and water pump sounds like its shot. Replace the water pump, thermostat and radiator hoses and the issue will likely be resolved.
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#10
It cools off because of airflow. If your heater works good then your waterpump is probably working fine. Problem is at idle rpm your not getting enough flow through your radiator. If you a/c works good at idle, then your fan clutch is working properly. If you pull your radiator cap and can see a scale build up them you can be sure that is throughout your radiator. Probably wouldn't hurt to replace both pump and radiator, however the radiator is cheaper and easier to replace. That's where I would start.