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  #1  
Old January 20th, 2012, 04:29 PM
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aaron lam
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Bleeding Coolant

Hi,

So I am going to change out the 4 coolant hoses on a 97 D90. Question is, when I put everything back... how do I bleed the coolant system?

From what I gathered... which might be all wrong.

1. Fill coolant in radiator plug but leave plug off (empty reservoir tank and that cap off too)
2. Turn engine on and idle... will coolant come out of the radiator at this point?
3. Turn engine off... top off radiator and cap plug
4. Fill reservoir tank to half and leave cap off
5. Turn engine on and idle
6. Fill reservoir tank to half and cap

Does that sound right? And anything I should be cautioned of?

Thanks!
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  #2  
Old January 20th, 2012, 04:45 PM
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Do 97s have the plug on the metal heater lines on the passenger side? If so, open that up the plug on that too. Caution is only that the plastic plugs may break and are easy to cross thread getting back on.
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  #3  
Old January 20th, 2012, 04:51 PM
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Mike
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Quote:
Originally Posted by aaronlam View Post
Hi,

So I am going to change out the 4 coolant hoses on a 97 D90. Question is, when I put everything back... how do I bleed the coolant system?

From what I gathered... which might be all wrong.

1. Fill coolant in radiator plug but leave plug off (empty reservoir tank and that cap off too)
2. Turn engine on and idle... will coolant come out of the radiator at this point?
3. Turn engine off... top off radiator and cap plug
4. Fill reservoir tank to half and leave cap off
5. Turn engine on and idle
6. Fill reservoir tank to half and cap

Does that sound right? And anything I should be cautioned of?

Thanks!
Check this out...
http://www.defendersource.com/forum/...10&postcount=8
Although on a 97, I don't think you have a fill port on top of the PS valve cover.
I just drained and refilled on my 95, I didn't to anything with the the port on top of the said valve cover.
After re-filling and running the engine, let it cool, remove the fill plug on top of the rad and expansion tank and top off...

Good luck...Cheers...
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  #4  
Old January 20th, 2012, 10:42 PM
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Jack the front of the truck up, it works for me. I have a filler spout in the heater lines that helps with the air.

I am a broken record but that factory gauge is a poor means of determining if you are over heating.
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  #5  
Old January 21st, 2012, 07:19 AM
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explain what? The cooling system is a closed system, would it matter if the filler plug is 10" higher when you fill it? When I would drain the cooling system air got trapped and caused issues, I have been doing this the last couple of times and it works for me.
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  #6  
Old January 21st, 2012, 07:27 PM
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Nick Vogel
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Quote:
Originally Posted by rover4x4
I am a broken record but that factory gauge is a poor means of determining if you are over heating.
Couldn't agree more. A lot of the problem is that damn ground on the back of the gauge.
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