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post #1 of (permalink) Old 01-05-2001, 02:33 PM
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Mystery of lost anti-freeze??

Atleast once every week or so I am "filling" up my radiator (It starts to run a little hot and I know I need to add to it)? I've checked everything, cleaned everything, flushed, new cap and then added dye. Can't seem to find anything?

Could it be my resevoir? It doesn't have any cracks or leakage?

Thanks,
CMG

1989 bronco...100 and something thousand miles...351...C6
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post #2 of (permalink) Old 01-05-2001, 04:43 PM
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Re: Mystery of lost anti-freeze??

Well, it's nice to know that I'm not alone. I can actually see anti-freeze dripping out of my lower radiator shroud. I can't tell where it's leaking from. I replaced my drain cock valve, but that didn't fix it. I popped the hood this morning and I noticed drops of anti-freeze on top of my fan shroud. I don't know what's going on. I think I just need to pull the radiator and pressure check it. Mine has plastic tanks on each side of the coils. I think it might be leaking from this seal.

Do you have an internal leak or can you see fluid dripping?

post #3 of (permalink) Old 01-05-2001, 05:44 PM
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Re: Mystery of lost anti-freeze??

Replace your radiator cap - they're cheap. If the cap fails to hold pressure (as they frequently do - even new ones), they coolant will evaporate right out the filler neck leaving no trace.

Steve
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post #4 of (permalink) Old 01-05-2001, 06:51 PM
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Re: Mystery of lost anti-freeze??

Thump: I can't tell where the problem is? There are no signs of leakage anywhere! All I know is when I check the level it seems to be low.

Steve83: My cap is only about a week old. Should I assume its bad?
Thanks for the help

1989 bronco...100 and something thousand miles...351...C6
post #5 of (permalink) Old 01-05-2001, 07:28 PM
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Re: Mystery of lost anti-freeze??

No, it's probably OK, but you could get it checked at a decent radiator shop. Even if you don't pay them to diagnose the problem, they probably won't charge you to check a cap.

While you're at it, check the hose from the filler neck to the overflow tank and the seal at the lower hose. Drips at these locations wouldn't leave much residue, so look closely. Also, look ALL OVER the block for areas that are cleaner than their surroundings (steam cleaned) and see if anything is coming out of the bellhousing. Freeze plugs and head gaskets can have intermittent leaks.

Steve
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post #6 of (permalink) Old 01-05-2001, 07:41 PM
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Re: Mystery of lost anti-freeze??

It could be leaking in several spots.

Steam clean the engine then after its clean get it dusty (kinda hard this time of year) then start the truck cold and let it warm up without driving it and then after its warm or hot shut it off and look for drips leaving a trail in the dust on your engine.

It could be a small crack in a hose, could be a head gasket, could be several things. The small leaks are really hard to find especially with the fan blowing all that air around. I'd check the heater hoses back where it goes into the firewall. A small crack here could easily drip fluid where it would get lost on the back of the engine and blow back under the truck and go unnoticed.

Good luck,

- Dan


99 4Runner (wifes grocery getter)
My Bronco is sold.
What trail rig will be next...
post #7 of (permalink) Old 01-05-2001, 09:42 PM
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Re: Mystery of lost anti-freeze??

Check your oil. If it's a milky color then it means cooler and water is getting into the block because a head gasket has blown. If this happened just hope that no damage was done. I had to get new heads when this happened to me because I waited so long to get the gasket replaced.......Woody

post #8 of (permalink) Old 01-05-2001, 10:47 PM
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Re: Mystery of lost anti-freeze??

Steve83 and DanH: Prior to making this post I cleaned the bottom of the engine with gunk/pressure hose and then added "coolant dye" to see if that would show me where my problem was and that didn't show anything? A "friend" mechanic told me those dyes are the best thing for spotting leaks? What do you guys think?

Wood1: No milky color in the oil...checked that right when I noticed a lower level in my radiator! Thanks for the suggestion.

And thanks guys for the help!

1989 bronco...100 and something thousand miles...351...C6
post #9 of (permalink) Old 01-05-2001, 11:06 PM
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Re: Dye

Never heard of it - never used it. Coolant already has fluorescent dye in it.

Steve
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post #10 of (permalink) Old 01-05-2001, 11:16 PM
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Re: Dye

Actually, if you must Know, I Have been Stealing your Coolant.....So i Can use it on my truck, Because I'm to cheap to go buy my own.....Don't worry though, i should get that coolant leak fixxed here soon, so then your Coolant will be Safe!!

"Wastin Away Again In Margaritaville"
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