Coolant purge from cap

[Dennis H]

Ambient 85 degrees. Radiator top near cap read 195. Why did it purge from the cap and not go into the one of one recovery tank. The hose is not pinched, and I’m waiting for it to cool to see if the cap is properly secured. Time for a cap? Pictures will tell the rest. 7 mile drive ending with about 10 minute idling.

 

[JimCoronette]

My guess would be cap, have a spare to test it?

 

[Dennis H]

No spare.

 

[Dennis H]

Best source for a 2 eared 16 lb cap?

 

[Dennis H]

No distinctive shhh when opening, now it won’t replicate the purge. Idling in driveway for ten minutes. AC on. 20 minutes now and gauge reads under 180. I’m gonna call it a fluke and replace the cap.

 

[BDF6]

I use this. No problems in 6 years (time to replace!?) Many, many miles & temperature EXTREMES.

 

[Budnicks]

my 1st educated best wild *** guess

the rubber gasket on the cap
that seals against the top of the radiator

is probably faulty

 

[Ranger16]

I'd vote for the cap as well, but I'd also bet your radiator is overfilled. If you don't leave any (or enough) headspace for expansion, it will overflow. Once at the proper level, you should never need that overflow bottle.

 

[Dennis H]

I’m a 2” to the top guy. Maybe the shop topped it up. There was a lot of grunge, but the seal looks ok. I blew back through the overflow tube and blew a chunk of something out. I will replace the cap, keep an eye on it and call it a day. Best it happened in the driveway.

 

[BDF6]

I had a plastic water bottle there also. Evian, I think? Heavier plastic & squished in just right.

 

[Billccm]

summit racing
works great

 

[BDF6]

Was this the hottest day of the year for you to date?

 

[Dennis H]

No.

 

[Ironbuilt]

You can test the cap with a pressure tester.

https://www.amazon.com/Stant-12270-...203172&s=gateway&sprefix=radia,aps,342&sr=8-3

 

[Dennis H]

I’m hung up on the 2 ear cap that I remember Ma using. Can’t find one. Finding only NOS for $27.

 

[Frank Mopar]

summit racing
works great

View attachment 793778

Coolant recovery bottle like shown and a Stant 10231 cap.

 

[BDF6]

Sorry, the "two ear" detail went right over my head.
Been a long day. Week, month, year...getting better now that car is back in the shed.

 

[moparedtn]

We gotta use a cap made for use with an overflow, right?

 

[Dennis H]

10231 is supposed to do that. Amazon. Not 2 eared but I just want it to work. Summit shipping ran the cost a little higher than Amazon.

 

[1967coronet]

10231 is supposed to do that. Amazon. Not 2 eared but I just want it to work. Summit shipping ran the cost a little higher than Amazon.

Check with napa. I am pretty sure my 2 ear stant 16# came from there.