Archived Overheating after water pump replacement

[GCuzzy]

Just had my 5.9 2003 water pump replaced yesterday by my diesel mech. I confirmed coolant level was correct as well. Driving in town tonight moderate traffic when I noticed the temp gauge climbing VERY fast. I pulled over at 235 deg.just shy of the red zone and had to limp home. WAG do you think I have an air lock. I tried running the cab heater, NO heat coming out the vent. Also the radiator was cool.

 

[seafish]

If your mech also replaced the thermostat, it is possible that he put it in upside down (ooooops!!!)

 

[NIsaacs]

Check your water level now, it will be low.

Nick

 

[mwilson]

As Nick says, coolant level first. I'll be surprised if it is not low.

If full of coolant I would then check the routing of the serpentine belt to make sure that the pump is turning in the proper direction. I have seen them installed incorrectly, more common than you would think.

 

[GCuzzy]

Just had my 5.9 2003 water pump replaced yesterday by my diesel mech. I confirmed coolant level was correct as well. Driving in town tonight moderate traffic when I noticed the temp gauge climbing VERY fast. I pulled over at 235 deg.just shy of the red zone and had to limp home. WAG do you think I have an air lock. I tried running the cab heater, NO heat coming out the vent. Also the radiator was cool.

Back in the shop. Mech says the water pump maybe bad. Stay tuned.

 

[JR]

Back in the shop. Mech says the water pump maybe bad. Stay tuned.

Hopefully he admits his mistake rather than blame it on the new pump. You would think he would have caught that when he ran it up to temp to circulate the coolant...

 

[MLee]

And maybe the coolant didn't settle all the way either. Air lock? No coolant circulation, will be cold radiator. collapsed hose?

 

[p-Bar]

Need to burp it . you may have a air pocket

 

[NIsaacs]

I confirmed coolant level was correct as well.

Did you check the radiator or just the overflow bottle? I can't imagine anything wrong with the new pump unless there is a left/right rotation somewhere with different generation trucks. I would be a little concerned about the high temps. If the system was low the temp sending unit can send a faulty signal. They need full coolant circulation to read right, hot steam can give a poor signal.

If a cooling system is full, 240* is no big deal, but if it's low, 240* can damage parts.

Nick

 

[Sticks]

I have yet to run an engine to "burp" any air pockets. I use a vacuum tool that pulls the coolant system under 21" of vacuum, then suck the coolant back into the system. So easy and clean (no spillage) yet people still insist on pouring it back in then chasing air pockets.

Air pocket, Thermostat, bad replacement, a belt routing issue would be hard, or forgot to pull a rag out of the hole (seen that 3 times).

 

[MMeier]

If your using a Cummins T stat, air pockets should be a non issue, since they have those jiggle pin thingies on them, correct ?

 

[GAmes]

C o r r e c t.

 

[muchsnow]

So what was it??....