Discuss Bleeding/burping coolant system in 98 mustang on AllFordMustangs.com, the place for Mustang enthusiasts.
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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 -24°C (-11°F) and 60 percent or -52°C (-62°F).
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 -_-
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
'97 3.8 Pacific Green Modified~ 1996SVTCOBRA White