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swhitney
New User
Sep 13, 2009, 8:37 AM
Post #1 of 8
(6856 views)
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4.0L jeep overheating
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1999 Jeep Wrangler 4.0L I6. Engine overheats under heavy load or over 45 MPH. Radiator replaced due to leak / Cooling system had excessive rust, so much so that the fins on the waterpump were gone when pump was removed / Replaced waterpump with reverse rotation pump (serpentine belt) and replaced thermostat with 160 deg / Thoroughly flushed system with non-acidic flush and removed waterpump to verify block looks like new inside / All coolant hoses changed because they felt brittle / Attempted reverse compression test by applying air to each cylinder on top dead center and found no bubbles in radiator cap or air leaks from throttle body or exhaust / Air conditioning condenser free of debris and nothing between the condenser and radiator to block air flow / Fan clutch replaced just for good measure.
Did I miss anything?
Thanks,
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 13, 2009, 10:38 AM
Post #2 of 8
(6846 views)
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Re: 4.0L jeep overheating
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Although pumping air into the cylinder sounds foolproof, it really isn't. The best way to test for that is with an emissions analyzer over the radiator.
I'd also remove the upper radiator hose and run the engine just to make sure the pump is working properly and your getting good flow.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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swhitney
New User
Sep 13, 2009, 10:54 AM
Post #3 of 8
(6842 views)
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Re: 4.0L jeep overheating
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What's the best way to increase flow?
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 13, 2009, 10:56 AM
Post #4 of 8
(6839 views)
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Re: 4.0L jeep overheating
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You can't increase flow. You just verifying that you have the right pump rotation.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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swhitney
New User
Sep 13, 2009, 12:13 PM
Post #5 of 8
(6835 views)
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Re: 4.0L jeep overheating
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I have verified that the coolant is flowing and in the correct direction.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 13, 2009, 4:57 PM
Post #6 of 8
(6828 views)
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Re: 4.0L jeep overheating
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?? What's this with the reverse water pump?? If fins aren't right flow would be too low if directional,
T
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 13, 2009, 5:03 PM
Post #7 of 8
(6823 views)
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Re: 4.0L jeep overheating
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Jeeps use 2 different water pumps depending on what kind of belt they use because the pump that is driven by the backside of a serp belt turns the opposite direction and they make them both ways.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 13, 2009, 5:43 PM
Post #8 of 8
(6819 views)
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Re: 4.0L jeep overheating
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Learn something new every day! I didn't know how they did what with an age old engine TMK?? Unfortunately forget two or more of something every day too - just laugh. The alternative is too sad,
T
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