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Old 07-16-2007, 05:51 PM   #1
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Default What happens when water pumps go bad?

Reason I'm asking....with the clutch fan back on and a 180* t-stat my truck cruises between 200 and 210 and idles as high as 225*. My water pump has about 100k miles on it. I just picked up a new one today, but does anyone know what happens when one goes bad? Do the gradually lose the ability to efficiently pump water? Sucks, because I have a brand new 180* stat in there, and the new water pump is the 05+ style, so I have to buy ANOTHER thermostat.
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Old 07-16-2007, 05:55 PM   #2
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Was your new engine running cooler before?
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Old 07-16-2007, 05:56 PM   #3
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Quote:
Originally Posted by phasemaster1
Was your new engine running cooler before?
I had a 160* stat and e-fans on the old engine. Would run between 190 and 200 in hot weather and idle in the 190's.
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Old 07-16-2007, 05:57 PM   #4
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I'm going to say thats about normal. with my 160 stat, mine cruises around 175-180. At idle in this heat will creep on up to 200-210.
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Old 07-16-2007, 05:59 PM   #5
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I don't think it's normal. I have a 34" radiator in there. My mom's 2000 Suburban with the 27" radiator and clutch fan NEVER got past about 215*, either at idle or when towing up a hill at WOT 2nd gear at 60 mph/5500 RPM for 5 minutes straight. I understand my setup is a totally different animal, but it shouldn't get that hot when idling....
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Old 07-16-2007, 06:04 PM   #6
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you might still have small air pocket...ive been fighting with mine a few days and finally think i have most of it out. i was seeing 225* at 40 mph cruise speed and 240 at one point now that i drained and started all over 190-205 and 197 idle.oh yeah thats with the 160*stat.with that new engine it might be normal...
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Old 07-16-2007, 06:12 PM   #7
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Quote:
Originally Posted by thunder550
I don't think it's normal. I have a 34" radiator in there. My mom's 2000 Suburban with the 27" radiator and clutch fan NEVER got past about 215*, either at idle or when towing up a hill at WOT 2nd gear at 60 mph/5500 RPM for 5 minutes straight. I understand my setup is a totally different animal, but it shouldn't get that hot when idling....
I'm running the 34 inch radiator too, but with electric fans. Do you have the fan shroud installed?
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Old 07-16-2007, 06:14 PM   #8
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Quote:
Originally Posted by ranwalk
I'm running the 34 inch radiator too, but with electric fans. Do you have the fan shroud installed?
Yes I do.
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Old 07-16-2007, 09:17 PM   #9
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Do you have the little hole on the thermostat facing up? If the stat doesn't have a hole, I would drill a very small one and put it at the top when installing.
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Old 07-16-2007, 09:19 PM   #10
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The only water pump failures I know of are the impeller spinning off the shaft=overheating immediately. Or, seal going bad and leaking coolant out of the weep hole in the bottom.
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Old 07-16-2007, 09:19 PM
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