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95 wrangler water temp wierdness
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completelyhis
User
Dec 9, 2008, 10:51 PM
Post #1 of 6
(1422 views)
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95 wrangler water temp wierdness
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my wrangler has a 2.5 liter in it. I recently rebuilt the engine aobut 25k ago. 5k piror to that i had replaced the water pump, so i used that one on the rebuild. i noticed today that after warming it up before going to work the windows still were not defrasted. i got in and looked at the temp gauge, which was up around 225-250. it was 38 degrees out, and it had only been running for 3 minutes or so. the defroster was blowing cold, though the heat was on. i shut it off, felt the hoses, both were warm, but not hot. thinking maybe there was an air bubble around the thermostat or something, i got in and drove it around for a few minutes. i noticed as soon as i started normal driving the temp leveled out and the heater blew hot. Here's what i noticed the rest of the day:
- if i let it idle down below 1500rpm the heat pegs instantly]
- if i keep it above 1500rpm it hold stead at 210
- it only takes 2 seconds or less for the temp gauge to go from 155 to 225, when i start idling.
- whenever the temp needle "pegs" the heater isn't blowing hot air.
what do you think?
thermostat? maybe it is being pushed open by the extra water pressure when idling high? less than 25 k on the thermostat.
water pump? extra velocity when idling high? less than 25 k on the water pump.
air buble? causing the thermostat to open/close incorrectly? I tried burping it, but it didn't seem to want to burp?
thanks,
Ian
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Loren Champlain Sr
Veteran
/ Moderator
Dec 10, 2008, 5:54 PM
Post #2 of 6
(1408 views)
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Re: 95 wrangler water temp wierdness
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Ian; Sounds like you are on the right track. Sounds like a 'sticky' thermostat or an air pocket.
Loren
SW Washington
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completelyhis
User
Dec 10, 2008, 10:23 PM
Post #3 of 6
(1402 views)
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Re: 95 wrangler water temp wierdness
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So you'd lean away from it being the water pump?
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Loren Champlain Sr
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/ Moderator
Dec 11, 2008, 6:02 PM
Post #4 of 6
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Re: 95 wrangler water temp wierdness
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Not neccessarily; Although quite rare, I've seen water pump impellers slip on the shaft when warm. But only, maybe three or four times in 40 years. I've also seen impellers eaten away. If a system has had a leak and air is introduced, the air bubbles (believe it or not) will actually wear away the impeller. You should be able to remove the thermostat and then watch the radiator for coolant flow. If the flow is poor at idle (of course, it will be higher at elevated rpms), then you could have a pump or radiator flow problem.
Loren
SW Washington
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completelyhis
User
Dec 28, 2008, 1:29 PM
Post #5 of 6
(1361 views)
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Re: 95 wrangler water temp wierdness
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Ends up i had a small leak in my lower radiator hose, which created a large air bubble. The radiator and reservoir were both "full" so I just had to burp it real good.
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Loren Champlain Sr
Veteran
/ Moderator
Dec 28, 2008, 1:58 PM
Post #6 of 6
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Re: 95 wrangler water temp wierdness
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Good job! I was sure that you'd get to the bottom (no pun intended) of it.
Loren
SW Washington
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