Running Hotter Since New Water Pump - Defender Source
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  #1  
Old January 1st, 2011, 01:25 PM
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Matthew Carey
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Running Hotter Since New Water Pump

I'm running a bit hotter post new water pump then pre, any thoughts?

Thanks MWC
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  #2  
Old January 1st, 2011, 01:55 PM
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Is it that this one is reading too hot? or the old was reading too cold?
How hot is hot?

-Hans
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Old January 1st, 2011, 02:10 PM
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Need to purge air bubbles? Might need to install more reliable secondary temp gauge?
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Old January 1st, 2011, 02:18 PM
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Try a infared temperature gun, and yeah check air bubbles.
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Old January 1st, 2011, 02:33 PM
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Maybe take out the thermostat and see if that helps flow of coolant? Why did you replace water pump in first place? Running hot?then what else did you check or replace first? Is the fan engaging? Miles? Head gasket ever replaced?
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Old January 1st, 2011, 02:45 PM
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Did you replace the thermostat with the water pump. I just replaced mine as before my water pump imploded the gauge went into the red. Always a good reason to replace. They are cheap
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Old January 1st, 2011, 02:55 PM
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Hans

It would stay dead center with the old pump, ever since the new pump its a couple degrees to the right side of center. So it's not hot but definitely hotter then before.

Thanks matthew

------ Follow up post added January 1st, 2011 03:00 PM ------

Thanks for all the help. I replaced the pump because of play in the fan. I haven't done the head gasket yet, and the car has 85k on it. Also didn't do the thermostate when I did the pump. I was thinking air bubbles also since I thought the hose felt too firm.

Matthew

------ Follow up post added January 1st, 2011 03:07 PM ------

Also what's the best method for removing air from the system?
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Old January 1st, 2011, 10:58 PM
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Jack the front of the car whilst filling up to get an angle is supposedly the way to avoid airlocks. Massage the hoses and you should be able to clear any trapped air.
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Old January 2nd, 2011, 12:06 PM
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"I replaced the pump because of play in the fan." - quote

Silly question, but did you replace the viscous coupling as well as the pump? its more likely to fail and cause slop in the fan, and overheating...
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Old January 3rd, 2011, 09:41 PM
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I didn't replace the coupling but the play is gone since I replaces the water pump. Is there a way to check the operation of the coupling?
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Old January 3rd, 2011, 11:55 PM
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http://www.defendersource.com/forum/...eferrerid=2930

There are a couple of tips in this tread. A little searching will turn up more.

Basically, when engine is running but cold the fan should turn slowly - not at engine speed. when the cold engine is stopped the fan should freewheel and be very easy to turn by hand.

when engine is up to full running teperature the coupling should engage and spin the fan at engine speed. Stop the hot engine and try turning the fan by hand and it should be tight, or difficult to turn. if it is in any way loose, change the coupling.
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Old January 4th, 2011, 10:57 PM
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http://www.defendersource.com/forum/...ad.php?t=29126

fan clutch for $20
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  #13  
Old January 5th, 2011, 08:50 AM
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Thanks everyone for your help I'll report back my findings.

Thanks again Mwc
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  #14  
Old January 5th, 2011, 08:58 AM
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Quote:
Originally Posted by owen View Post
http://www.defendersource.com/forum/...eferrerid=2930

There are a couple of tips in this tread. A little searching will turn up more.

Basically, when engine is running but cold the fan should turn slowly - not at engine speed. when the cold engine is stopped the fan should freewheel and be very easy to turn by hand.

when engine is up to full running teperature the coupling should engage and spin the fan at engine speed. Stop the hot engine and try turning the fan by hand and it should be tight, or difficult to turn. if it is in any way loose, change the coupling.
Actually you shouldn't expect the fan to run all the time at normal running temp ... only when it needs to provide additional cooling .... if you run the engine, when it starts to get hot you should hear the fan engage and vrrooom!! You can check the operation by sticking a rolled up news paper or magazine gently into the blades. When the fan is running it won't stop! When it's not engaged it will stop easily.
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Old January 5th, 2011, 09:44 AM
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agreed
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  #16  
Old January 6th, 2011, 11:06 PM
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Thanks to All

It's the viscous coupling, thank you to all for the help.

MWC
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