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Unread 10-24-2011   #1 (permalink)
scubasteve_98v6 is offline Rookie


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Question Bleeding/burping coolant system in 98 mustang

Hey guys! First time posting on here, read plenty of posts and you guys are awesome

I recently replaced my radiator in my 3.8L v6 1998 mustang and now i am ready to fill the radiator/cooling system with coolant. How do i go about bleeding the air out? I have been told the following:

Fill the (cold) radiator to the brim with coolant, run idle for a few minutes with rad. cap off and hot air on to open the thermostat, and then top it off with coolant.

Do i need to worry about a bleed valve? Or should the radiator cap being off sufficiently "burp" the system?
If so, where is the bleeder valve located on my vehicle?

thank you guys!!
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Unread 10-24-2011   #2 (permalink)
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Use the bleeder valve.
It should come up off of a neck right above the thermostat. It should be labeled.
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Unread 10-24-2011   #3 (permalink)
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You definitely need to use the bleeder valve. If you don't you take a chance of running hot.

Last edited by bissl8; 10-24-2011 at 08:38 PM. Reason: Spelling
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Unread 10-24-2011   #4 (permalink)
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Alrighty, and do i completely remove the screw? and leave it open the whole time?
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Unread 10-25-2011   #5 (permalink)
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On 3.8L engines, the vent plug must be removed before radiator fill or the engine may not fill completely.
NOTE: It is important to maintain engine coolant concentrate between 40 percent or -24C (-11F) and 60 percent or -52C (-62F).
Fill the engine cooling system with 50/50 mixture of water and engine coolant.
After filling the engine cooling system, add coolant to the vent until full. Install the vent plug.
Leave the pressure relief cap off and run the engine until it reaches normal operating temperature.
Stop the engine and add the correct engine coolant mixture to the degas bottle/coolant expansion tank until the coolant level is between the COOLANT FILL LEVEL marks.
Turn the engine off and allow the cooling system to cool. Check the level in the degas bottle/coolant expansion tank, and add a 50/50 mix as needed

This will not always work the first time, sometimes you have to bleed it more than once, trust me I found that out the hard way -_-
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Unread 10-25-2011   #6 (permalink)
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Default V6 coolant fill procedures

+1 on above. The V6 coolant fill procedures must be followed exactly. Do not cut corners.

http://www.allfordmustangs.com/forum...t.html#2604913
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Unread 10-25-2011   #7 (permalink)
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Thank you! That makes it almost crystal clear to me now

the only question i have, just to make sure, is that the first thing i do is remove the vent plug (bleeder) and leave it off until the end pretty much?

thanks!
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Unread 10-25-2011   #8 (permalink)
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Once you fill the radiator and the breather tube with fluid then you reinsert the bleeder valve......
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Unread 10-25-2011   #9 (permalink)
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Sorry, David, i'm relatively new to this. Thank you for your patience

So fill cold radiator, fill valve, replace valve plug, then continue? :P
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Unread 10-25-2011   #10 (permalink)
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Yes lol.............
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Unread 06-24-2012   #11 (permalink)
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Hey guys thanks my wife"s car was just doing that over heating and now i did what you said i will see if it stops
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Unread 06-25-2012   #12 (permalink)
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Like mentioned above plus some more info:
Remove vent bolt, middle of engine area above thermostat housing. Squeeze lower hose and then upper hose. Start engine and fill to top of vent plug hole. When & if you replace the thermostat, ours has a relief hole in it- Explanation:180 Degree Thermostat in a 3.8L V6 Mustang
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