Re: antifreeze dirty? UIM?
[quote="klystronik"]I noticed recently that my antifreeze is dirty..at the top of the resevoir its clearish orange like new..but lower in the tank where it tapers down its dark and mucky..quote]
You don't say if the cooling system had been rinsed and DexCool changed before. Have you owned the car since 1997 or do you know?
If it hadn't been changed and the coolant recovery tank brushed out, it'* probably just normal accumulation of gunk and the antileak material put in at the factory when the car was new. That material is ground up walnut shells or some organic material like that which will catch in seeping areas and tend to grow catching other particles to block the leak.
My suggestion is to look at the coolant inside the radiator cap opening. If it looks good, I'd remove the overflow hose at the radiator cap, use a bottle brush, to rub the inside of the overflow tank with dishwashing detergent ( Dawn), and then let drain through the tube at the radiator cap. I repeated and rinsed thoroughly a couple of times to remove all detergent.
This avoids having to remove the bolts to get the tank out (I'm lazy when possible).
Then watch to see if the crud shows up again.
Change DexCool every 24 months. Leaving it in longer may cause problems (or may not depending on who you believe). It'* cheap to drain and replace it yourself.
If the radiator was flushed a year ago, it should have only DexCool in it. If you think it may have had green stuff in it, accidentally or on purpose, before that flush and change,
I'd do a second flush just like BillBoost says. Then you KNOW for sure.
Dual auto air on both