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Old 05-31-2011, 07:02 PM   #1 (permalink)
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If radiator cap is left off, should it overflow or be okay?

If I leave the radiator cap off after filling it with coolant, should I be able to just leave it off and it flow just fine when it gets to operating temperature?

If I do this, it starts overflowing, wondering if my radiator is not flowing properly.
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Old 05-31-2011, 07:12 PM   #2 (permalink)
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Nope, water expands..

If you let it over flow, when the thermostat opens it should suck down and start "flowing." Good way to check thermostat, and water pump function. Most shops have an attachment funnel to the radiator cap so that when it expands it doesn't go anywhere, and when the thermostat opens the fluid goes back into the radiator.. Otherwise, on the suck down process you could potential introduce air into the system.
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Old 05-31-2011, 07:31 PM   #3 (permalink)
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okay, thanks! & Yeah I went to the autoparts store looking for one of those just last weekend but they didn't have a funnel like that.
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Old 05-31-2011, 08:50 PM   #4 (permalink)
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I think most are homemade.. Might be worth it, one of those things that you would only need one to last your entire life.. lol
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Old 06-09-2011, 03:16 PM   #5 (permalink)
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Also, the rad cap also keeps the system pressurized which helps to raise the boiling point of the fluid.
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Old 06-09-2011, 06:04 PM   #6 (permalink)
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actually radiator fill funnels are not home made. i know a technician that had one before he quit bein a tech, i've seen them sparsely in auto parts stores, and some of them are special order tools. but you cna get them from Oreilly's, advance, autozone, but you may have to order it.
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Old 06-09-2011, 08:34 PM   #7 (permalink)
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Quote: Originally Posted by Boostinfamily View Post
actually radiator fill funnels are not home made. i know a technician that had one before he quit bein a tech, i've seen them sparsely in auto parts stores, and some of them are special order tools. but you cna get them from Oreilly's, advance, autozone, but you may have to order it.

For sure. I have radiator funnel kit from matco, it was less than 30 bucks. It came with 3 different adapters for the radiator for the basic applications. Really comes in handy in ensuring all air is out of cooling system, i use it almost everyday at work.
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Old 06-09-2011, 08:42 PM   #8 (permalink)
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.....called "spill free funnel" from matco
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Old 06-09-2011, 10:05 PM   #9 (permalink)
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Quote: Originally Posted by Boostinfamily View Post
actually radiator fill funnels are not home made. i know a technician that had one

Your stern rude statement makes you look like an ass clown.

You don't have to make you could buy, or could make one and not buy. Lol, the stupid statements people make.
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07' Shelby GT500
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Old 06-10-2011, 06:20 AM   #10 (permalink)
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^^of course u can make your own, but i think all boostinfamily meant was that they actually do make "professional" use radiator fill funnels.
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