Rusty Water in expansion tank
03-17-2019, 06:02 PM
#1
Racer
Thread Starter
Rusty Water in expansion tank
Hi folks, I drained my radiator a couple of years ago and now I notice the antifreeze has kind of a rusty oily film on top. Checked the oil and no water in th oil. Never noticed it until I changed the antifreeze. The is a stock L-79 motor . Should I drain it again and refill it, if so what antifreeze would you recommend. Thanks for any suggestions. Gary
03-17-2019, 06:54 PM
#2
Race Director
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C2 of the Year Finalist - Modified 2020
Did you flush the system the first time? If not, the rust scale may be getting circulated and you have a rusty tank. Zerez GO5 is the go to antifreeze. 
Dennis
Dennis
03-17-2019, 07:08 PM
#3
Racer
Thread Starter
Hi Dennis, no I didn’t flush it I just drained the radiator and filled it back with some generic brand. I’ll drain it again and use the coolant you recommended. Thanks for getting back to me.
03-17-2019, 08:08 PM
#4
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C2 of the Year Finalist - Modified 2020
Make sure you open the drain plugs on each side of the block. When you get them out, they might be plugged with debris. If so, poke them with a suitable object to remove the blockage. Remove the thermostate, then take a hose and run it through the block and the rad. For future cooling service, purchase 3 drain pet *****, two for the block, one for the rad. These make drawing the system very easy in the future. :The ZEREX is G-05 cheers: Dennis
Last edited by Bluestripe67; 03-17-2019 at 08:10 PM.
