Water pumps!!
 

I am replacing wzter pump and thermostat never been done snd 240,000km's on it! Figure its time , I have early make 2004 started cakling around snd im finding orices from 150$ to 600$ so im confused!
Napa 600$
Ford oem 275-300 depends on model
Ebay and rock auto 150$$
If anybody can shed some light on this it would be great one thing I do know is there is no way im buying a 600$ water pump
Thanks
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I have 250k miles on my original, factory belt too, I'm not sure I would change mine until started having problems.

The waterpumps suck in these. The plastic impellers crack and break and hardly push any coolant. Typically before 100k miles.

What's the build date on your 04?

3C3Z-8501-A is for PMP ASY-WTR - 2002.5 to 7/18/2004
4C3Z-8501-AC is for PMP ASY-WTR - 7/19/2004 and up

Early one's are a 90mm impeller later one's are 100mm.

OEM are $160 or so from Tousley Ford Parts Depot

Bulletproof diesel also makes one now with a billet aluminum impeller blades... they're like $220

[ ] Bullet Proof Diesel Water Pump, Ford 6.0L Diesel

http://a248.e.akamai.net/origin-cdn....jpg?1318437067

My god I hate typing from my android spelling sucks ass miss my iphone! I hope I find a hapoy medium for my water pump just had headstuds doneand full egr delete still blowing cold air at idle, I guess weak waterpump can cause this as impellers wear out, and thermostats are only 25$ time to do and im gonna clean the heater core with CLR

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have you checked to make sure the heater valve is opening, trace the heater hose lines and there should be a valve in line that controls flow to the heater core, if your water pump was that bad you would be overheating no matter how cold it was out.

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It sits right on top of the passenger side valve cover between the oil fill spout and the turbo, it will have a vacumm line going to it,make sure it is pulling in or you won't get any heat.

Thanks guys for the info! Gonna flush core CLR and check hoses valves like u said, then if needed that bullet proof looks like the deal ! My ford dealer is 300$ and im early 04 will have to check door or vin, blowing cold at idle no good in winter, temp gauge is solid and truck runs great

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Yeah mine does the same thing, but I KNOW mine is headgaskets.

If you need Ford stuff just order from Tousley there, they'll ship to you and still be cheaper than your local dealer.

Mine could b head gaskets u never know....but on other hand ive seen peopke jump to conclusions always gaskets!!! Until a buddy had his cab off at dealer many thousands later still same problem because the basics were skipped if egr water pump thermostats and hoses ok guess what? $$$$$

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Is is possible to have "weak" water pump that there is no temp fluxuation on gauge but not enough pressure to push coolant thru core causing no heat at idle then warm when u rev it???

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weak tensioner / loose belt can cause it.

so can eroded impellor or front cover.