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  #1  
Old 03-01-2011, 06:52 PM
ERO ERO is offline
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Default Disappearing Coolant

I have a 2001 Ranger with the 4.0 SOHC engine and over the last couple of weeks, the coolant reservoir has been empty about a week after I fill it.

There is no oil in the coolant, and no coolant in the oil. The engine does not burn oil and the oil level is unchanged from the last oil change of 3 weeks ago.

The engine starts and runs just like new and there are no obvious leaks with the engine running at normal temperature, and no obvious leakage under the engine when parked. There is no smell (that I can detect anyway) coming from the exhaust and the fuel mileage is about the same as usual. The radiator itself is full when I remove the cap.
I plan to get a radiator pressure tester this weekend and try to find the leak, but I wanted to post to this forum in case anyone else had seen these symptoms.

Thank you
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  #2  
Old 03-01-2011, 06:54 PM
DiabloBlanco DiabloBlanco is offline
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Default Re: Disappearing Coolant

Did ya check your hoses?
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  #3  
Old 03-01-2011, 06:57 PM
ben10 ben10 is offline
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Default Re: Disappearing Coolant

might be a weeping hole or something, x2 on checking hoses for cracks and pin holes, if its in the right direction it will spray away from the motor so you wont smell it cooking. good luck with it.
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  #4  
Old 03-01-2011, 07:02 PM
ERO ERO is offline
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Default Re: Disappearing Coolant

Yes - sorry, I should have specified that in my orginal post. Just a while ago when I got home from work and the engine was at normal operating temperature, I checked the hoses visually and by feeling under them for wetness with the engine running, and they all seemed fine. I know that I need to remove them to be sure, but there is nothing obvious. This weekend I will try a pressure testor and/or removing the hoses to try to get to the bottom of this.
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Old 03-01-2011, 07:05 PM
DiabloBlanco DiabloBlanco is offline
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Default Re: Disappearing Coolant

Sounds like a pressure test is in order for sure.
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  #6  
Old 03-01-2011, 07:28 PM
01B3000 01B3000 is offline
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Default Re: Disappearing Coolant

Just to let you know, it could happen when the truck is cold like mine, mine leaks from the bypass hose when its cold because the thermostat hasnt opened yet, check your hoses when the truck is cold, pressure will be increases because of the thermostat being cold and closed, so it should be easier to spot. Even though mine is a 3.0, should be the same concept. I just dont thing the 4.0 has a bypass.
Also my friends 97 4.0's coolant disappeared all the time, he had no problems with the truck either.
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  #7  
Old 03-01-2011, 07:45 PM
michiganboy michiganboy is offline
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Default Re: Disappearing Coolant

I had a cracked seal on my cap once and that was the first of 3 leasks I've had on my 3.0. Same symptoms as you that's why I brought it up
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  #8  
Old 03-01-2011, 07:58 PM
ERO ERO is offline
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Default Re: Disappearing Coolant

Thanks everyone!

I will check each of those things this weekend.
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  #9  
Old 03-02-2011, 02:58 AM
Rubber Duck Rubber Duck is offline
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Default Re: Disappearing Coolant

My '97 4.0 is the same way, the coolent just seems to vanish for the overflow tank. The radiator is always full. Subscribed to see if there is an anwser.
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  #10  
Old 03-02-2011, 04:49 AM
oldcarfart oldcarfart is offline
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Default Re: Disappearing Coolant

Quote:
Originally Posted by ERO View Post
I have a 2001 Ranger with the 4.0 SOHC engine and over the last couple of weeks, the coolant reservoir has been empty about a week after I fill it.

There is no oil in the coolant, and no coolant in the oil. The engine does not burn oil and the oil level is unchanged from the last oil change of 3 weeks ago.

The engine starts and runs just like new and there are no obvious leaks with the engine running at normal temperature, and no obvious leakage under the engine when parked. There is no smell (that I can detect anyway) coming from the exhaust and the fuel mileage is about the same as usual. The radiator itself is full when I remove the cap.
I plan to get a radiator pressure tester this weekend and try to find the leak, but I wanted to post to this forum in case anyone else had seen these symptoms.

Thank you
pressure check while at normal engine temperture and running, observe tailpipe for any trace of white smoke.
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  #11  
Old 03-24-2011, 07:17 PM
ERO ERO is offline
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Default Re: Disappearing Coolant - Problem Solved

After getting a pressure check, the problem was in the thermostat housing and seals. There are 5 seperate peices in this assembly and after replacing them all, along with the themostat itself, the problem has been resolved.
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  #12  
Old 03-24-2011, 07:18 PM
DiabloBlanco DiabloBlanco is offline
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Default Re: Disappearing Coolant

awesome, glad its fixed!
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  #13  
Old 03-25-2011, 06:38 AM
Badmotorfinger1 Badmotorfinger1 is offline
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Default Re: Disappearing Coolant

Quote:
Originally Posted by Rubber Duck View Post
My '97 4.0 is the same way, the coolent just seems to vanish for the overflow tank. The radiator is always full. Subscribed to see if there is an anwser.
Check the back of the cylinder heads, there's a freeze plug there that is prone to leaking. Mine was leaking on the pax side and it took me a full day of searching before I found it. Your intake gaskets could also be leaking, these are known OHV issues.
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  #14  
Old 03-25-2011, 07:52 AM
gran touring gran touring is offline
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Default Re: Disappearing Coolant

My van does the same thing.The cap as mentioned earlier part of it.When it runs it pushes coolant in to reservoir till it runs out overflow and then when it cools it draws it back in leaving reservoir empty or almost empty.I used to keep mine full but drive it a few days it right back where it started.If radiator full cold you are fine.
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