cooling problem

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Mar 9, 2011 | 06:17 PM

McStein

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Joined: Nov 2010

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cooling problem

I have a 1986 ranger v6 2.9L 5 speed 4x4 with 91,000 miles. My water pump starting leaking out the weep hole on an so I replaced it. After I replaced it the temp gauge ran real hot. To the top if norm range. While it was running hot I turned to heater on and got cold air. I turn off truck, wait 5 minutes and open radiator. Alls good. I start it up again, gauge is reading right so I drive to my pop's house which is 1.5 miles away. No one home so I turn around(never turned off truck) and halfway home it starts getting hot but stays in the norm range. Today I drove it to work and temp was fine. After work it gets hot again so I got a thermostat and changed it. I just ran it warm and toped everything off and its still is running warm (at the top of the norm range) just from idling. Any ideas? I flushed the radiator out when we bought it in november (by removing it and flushing out both ways).

Any ideas?

Mar 9, 2011 | 06:42 PM

Rangerman Stan

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Joined: Feb 2006

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From: SE Michigan

Are you pretty sure the mix of antifreeze and water is 50/50? If more water is in it than antifreeze it may go to the high side of the normal range. This has happened to me before. Never overheated but always was on the upper end till I drained it and measured it before I put in new antifreeze/water.

Mar 9, 2011 | 08:18 PM

McStein

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Ya, if anything I've got 60%-70& coolant.

Mar 10, 2011 | 12:07 AM

ford2go

Cargo Master

Joined: Apr 2003

Posts: 3,476

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From: Frequently frozen MN

Sounds like you've got air in the line somewhere. You might have a pocket of air that forms in a high spot. Sounds as if it eventually breaks up.

You could search for burping and air in line or air pockets. It's been discussed here before.

Good Luck,

hj