Keeps over heating
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Joined: Oct 2016
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Keeps over heating
I have a 1990 ranger 2.9 L 5 speed with over drive. I've tried 3 thermostats. Flushed coolant system compleatly twice sprayed all derby out of radiator front n back. Checked water pump its good. I drive it 5 or 10 minutes and the over flow is boiling and pumps fluid to the ground. Im also compleatly in the red. Help please.
Moderator
Joined: Jan 2004
Posts: 13,851
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From: SW Va
Excessive exhaust back pressure from a restriction, like a clogged cat converter, muffler, kinked exhaust pipe, maybe a blown head gasket & or maybe a radiator cap that's not sealing good, & or a fan clutch that's not locking up, are some thoughts that come to mind. Let us know what you find.
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Joined: Jan 2002
Posts: 4,907
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From: suburban atlanta
With that engine, I'd be looking for cracked cylinder heads. You can check for CO or CO2 in the radiator using a testing machine that detects its presence. There may be a test strip available that will respond. A surgeons glove stretched over the radiator cap that gets REAL BIG might be another indicator.
If you have access to a 'bore scope' that will fit your plug holes, you can look around without disassembling the cylinder heads.
I think the problems with radiator, pump and clogged converter would take longer than 5 minutes to overheat the engine as much as described, but things vary.
tom
If you have access to a 'bore scope' that will fit your plug holes, you can look around without disassembling the cylinder heads.
I think the problems with radiator, pump and clogged converter would take longer than 5 minutes to overheat the engine as much as described, but things vary.
tom
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