Re: Instant overheating

Posted by Bob Johnson on October 07, 1997 at 09:48:04

In Reply to: Re: Instant overheating
posted by Dan Partain on October 06, 1997 at 21:30:29

I do not think that your radiator is "boiling over".I would guess it is one of the two following things.The Model A cooling system is not like modern cooling systems. It is an open system and is not pressurized.The radiator should not be filled up to the top.You should fill only up to the top of the baffle (if you do not have a baffle you have found your problem).If it is filled too high it will spill over until it is at the right level.The other possibility is that the water pump is moving water faster than it can flow through the radiator.So either there is a restriction in the radiator or the pump is pumping too fast. You should flow test the radiator.To do this disconnect the lower radiator hose and put run water through it with a garden hose. Adjust the flow of water coming out of the hose so that the radiator is kept full but does not overflow (all the water is comonig out the bottom of the radiator).At this point fill a 5 gallon bucket with the hose and time how long it takes to fill.It sould take around 9 seconds. (5 gallons in 9 seconds is 33 gallons per min. I think that is the correct flow rate)If it take more than 10 seconds the flow through the radiator is not fast enough.

Are you using anti-freeze in your car.If so try plane water since anti-freeze can cause floaming which will look like boiling over.Hope this helps.

Bob


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