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Old 06-08-2012, 09:36 AM
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snrusnak snrusnak is offline
Dodge Ram Forum Senior Member
 
Join Date: Jan 2011
Location: Orlando
Age: 28
Posts: 13,493
Gender: Male
Vehicle: 2010 Dodge Ram 1500
Trim Level: SLT
Color: White
Engine: 2008-20?? 287ci (4.7L) PowerTech V8 310hp 330lb/ft
Rep Power: 13
Rep:1385
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So you've replaced the water pump and heater core, and you are overheating? First thing to do is verify you got all the air purged out of the cooling system since you did the work. Start the truck on level ground(or with the front slightly elevated) and the radiator cap removed. Turn the heater on(fan on, vent set to floor, and on hot setting) then let the truck get up to operating temperature(or as close as it will get). Keep the radiator filled with coolant the whole time. As it's warming up and also once it's up to temperature, "burp" the air out of the cooling system by squeezing the radiator hoses to push the air up and out the radiator. Sometimes tapping them and the thermostat housing and radiator tanks also helps. Then replace the radiator cap. Most of the air should be out now. You will likely have to top it off over the next few hot/cold cycles. Also, make sure to use 50/50 antifreeze/water mix(too much antifreeze will cause poor cooling). Also be sure to maintain proper coolant level in the expansion tank(if this level is too low you can suck air into the radiator).

If this doesn't help, I'd replace the radiator cap(cheap) then the thermostat(cheap). This is of course if you don't actually have a leak somewhere(like suggested above, or a head gasket)...

Only other possibilities would be a bad clutch fan or a clog.
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