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I had mentioned this in a previous post, but can't find it. I have a '78 F150 with a new 460 in it. The problem is when it idles for any period of time over like 5 minutes it starts overflowing antifreeze. I don't have an overflow reservoir, yet I think that I need to address more than just that. I don't know what temp my thermostat is, but could anyone recommend a tstat I should be using? I read some similar posts saying 185-190 would be good. Also what else would anyone suggest to look into for this? Thanks.
Try replacing the radiator cap. That will cause that problem. If the cap won't hold the pressure it will puke it out the overflow or into the reservoir.
without the over flow catch can the radiator must have about 2"
of air space at the top when cold
it will overflow if there is too much water
yiu MUST have this air space for pressure to build up
liquids cannot be compressed
the best thing to do is put a catch bottle on it to eleminate the
coolant loss
If nothing else just put a milk jug in there to catch the coolant. Any normal engine is going to vent. Thats why the factory put overflow jugs on these things.
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