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Ok i'm a newbie so be prepared for a newbie question. My sister in law has a 99v6 stang and I was wanting to help by changing the coolant (coolant flush). What all is entailed and are there any screws that have to be turned to bleed out air pockets or anything like that? Read the owners manual and it didn't really help any. I just wanted to make sure that I do it right the first time so that I don't mess up the engine.

Thanks for the help
99v6TxStang

PS.. More details the better :)
 

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its pretty easy to do actually... if the coolant has never been changed you may want to consider getting a pressure test done and have a good cleaning done (pressure cleaning.... not sure what htey call it but they flush it out good) if you just watn to flush it yourself then you need to drain the coolant (the plug is on the pass side bottom of the radiator)

you can unbolt the hose as it goes into the firewall and use a hose to flush it out... i just dont like using tap water at all.... i only like to use 100% distilled water.

buy the premix 50/50 its distilled water and coolant already mixed up.

once you fill the radiator let it run and then check and add more as it needs it, remember to drain the resivior also just unbolt it and drain it and finish it up by cleaning it really good.

there is a bolt right in front of the upper intake that faces directly up you can remove to vent air from so i have heard, ive never tired this though.

a local shop is charging me 25 bucks tomorrow (im bringing my own coolant) to drain/fill mine. if you drain and fill every year you can save the money a full flush will cost you usually.
 

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Discussion Starter #3
awesome there is nothing like the power and connectivity of the internet.

Thanks for the prompt reply. and the very specific details thats what i needed!!

99v6TxStang
 

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Well what I would do is drain the radiator completely and take off the cap of the radiator. This will allow it to drain completely. The cooling system is waterbased so the coolant in the engine will drain also. The only coolant that won't drain is the coolant caught up in hoses. I wouldn't worry about this too much since it's a minimal amount. Plug up the radiator and fill. It'll take about 2 gallons. I personally would just buy 1 gallon of coolant and fill the radiator with that and refill the gallon container with water and pour that in.
 

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The drain petcock is on the pass side near the bottom of the radiator. Its a small white valve. The only coolant that will be left in will be the stuff in the block. The hoses will drain.

There is a bleeder screw in the coolant line on the engine. The line runs up and over the intake near the front of the engine. Remove the screw and leave it off while you drain and while you refill. It is the highest point in the coolant system and will allow air to escape as you refill. Put the screw back in.

Start the car and let if get warm. Turn it off and let it sit for an hour or so and remove the bleeder screw again. BE VERY CAREFUL WHEN DOING THIS. Make sure the engine has cooled since coolant under pressure can seriously burn you. This is referred to as burping the system.

IMHO don't buy the premixed coolant... Think about it they are charging you about the same price for half water as for what it costs for a full gallon of anti-freeze = rip-off.
 

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its kind of a rip off... but i dont want to run tap water... i guess you could buy distilled water... save some money there if you want just dont run tap water.

what can you do if you dont want to remove that bleeder valve? its where my temp gauge is and i dont really want to mess with it...
 

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SpectorV said:
what can you do if you dont want to remove that bleeder valve? its where my temp gauge is and i dont really want to mess with it...
How do you know for sure the premixed stuff uses distilled water??? Could be tap water.

That bleeder screw has a purpose. Its the highest point in the coolant system. If you don't use it to bleed the air out....you'll have to wait longer for the air to make its way out through the overflow bottle.
 
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