hello, my water pump is going out in my 6.0 for the 4th time and i need to know which one to order. the last time the truck was in it got the updated front engine cover kit part number 3z3c-6019-b. so at this point i cant seem to find out if i order a early build water pump with a 90mm impeller or a newer build with a 100mm impeller. my truck was built 9-17-03 so i know by that it means i get the old small one but not so sure about it because it has the updated cover. below is a list of the pumps that have been installed and why. any help would be great. every pump has been installed by ford under the standard warranty


1) first water pump leaked due to head gaskets being blown, blew seal
2) 2nd lasted 2 months and impeller cracked. = replaced
3) that one lasted about 6 months and started to run hot. ford said it was updated pump needed updated front engine cover. replaced both using kit above (impeller was cracked again also)
4) now truck is running normal coolant temps (190-192) but only have no heat if truck is at idle, above idle very good heat- seems like another cracked impeller to me. this pump has been on truck 14 months warranty is 12 months

 

some one has to to know what i need . anyone?

 

Do you have a crewcab truck??

 

yes my truck is a crewcab, short bed. it has a 4 inch lift and 35 inch tires. the mods i have done are as follows. 5" mbrp exhaust- turbo back kit. sct with spartan tunes. normally a k&n intake(not on now). a 58v ficm also. the truck has arp head studs as well.

 

dont think you have a pump issue at all. check the heater hoses to see if they are warm. also check the heater controll valve vacuum line to see if its still hooked up.

 

if i check the heater hose after the core after i have been idling with the heat on for a min or so its cool, if i check imediatly after driving and turn heat off so no fan on core it is still hot. the hose before the core is always hot. my heat will almost burn you its so hot if your hand is right by vent and driving. it acts like its not flowing enough. as for the vacuum line your talking about, where is it, i will check after i know what im looking for.


as for the post about the crew cab, what does that have to do with anything?

 

Cheezit beat me to it. The crewcab trucks have a valve in the heater line that helps control hot water into the cab. It's vacuum operated by a very small thin grey plastic line and it sounds like you have some kind of malfunction there although I don't know why it would close at idle since it has a vacuum pump to operate it, not engine vacuum.

 

the valve is plugged in, will try a vacuum pump today after work to look for a change.

 

the valve is plugged in, will try a vacuum pump today after work to look for a change.


any one know which water pump i need to order and replace mine? ford doesnt seem to know short of removing mine and checking which i have

 

so i finally got a hold of some one at ford that has a clue. with the front cover kit i listed in the original post i now use the newer 100mm water pump.

does anyone know how i can test the water pump for proper flow to narrow this down short of removing it and inspecting the impeller for damage?

 

Okay, I don't know who it is you talked to, but I would have to disagree. Hopefully this will clear things up for you. 3C3Z-6019-B is the part number for a 2003 model year front cover. The part number for the water pump for a 2003 model year engine is PW-480 (3C3Z-8501-A) which is what fits the above mentioned front cover. If it is in fact the larger water pump you desire, you would need to change to the front cover to the 4C3Z-6019-C part number (which is for 2004 model year applications built AFTER 09/29/2003). Doing so also requires changing the water pump to a PW-491 (4C3Z-8501-AC) part number, which is the water pump with the larger diameter you desire.

Disconnect the small diameter hose from the intake mainfold to degas bottle, at the degas bottle end. Start the engine up, with that hose aimed into a container to catch any coolant flowing out. You should see coolant flowing out at a steady stream. If you see no flow, the water pump is not doing its job.

 

i talked to the tech who has done all the work on my truck in the past 3 years. he said that he updated my truck to the new pump and cover. i got that number off the warranty reciept papers i got when i picked the truck up for the last time. as for which one i get i dont care as long as i can get it to stop going out every year, this is getting old. once i get it apart is there a way to verify which cover plate i have visually so i put the correct pump with it. at this point i plan on just using a napa lifetime warranty pump since i have put 4 ford pumps in a they dont last.

 

I'm just going by the part number you posted in the original thread, which is the correct part number for a 2003 application that has never been updated in any way that I'm aware of.
Although I haven't personally come across repeat failures of 2003 model year water pumps, I have read about several other fellow techs who have run into this very issue you describe. Late 2004 and later model year pumps have not yet failed on any trucks that I have wrenched on, so I would think the larger diameter pumps are better.
Unfortunately, no. About the only way you'll determine which water pump you have in your truck is to remove it and physically measure the diameter of the impeller blade. You now have the correct part numbers that correspond to the applications in question, so hopefully that will take the confusion out of the process for you, whichever route you choose to go, to rectify your issue. Whatever route you choose to go, I hope it works out nonetheless.

 

so i did the test a few days ago with the hose at the degas bottle, at idle i had no coolant flow. anything over idle i had flow. i ended up ordering both pumps so i knew i had the one i needed when i got there, after taking it apart i did have the updated cover plate and water pump with the 100mm impeller. i found 1 of the fins on the impeller to be broken, about half was missing, used a scope and could not find part any where, did find some small pieces of what looked like plastic in drain bucket that coolant was in. i was a little unsure if one broken fin was really my problem, installed new pump anyway. i now have correct coolant flowing out the hose at idle, truck runs at correct temps and i have heat all the time, so i guess that half a fin makes a big difference, i did change the stat while it was apart. just wanted to follow up on the situation and say thanks to everyone who helped.