Overflow tank boiling

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10-24-2015, 12:01 AM
IPD

Overflow tank boiling

Not my 3/s, but probably similar for any/all cars. Fluid in my overflow tank is boiling. I've heard it bubbling previously, but tonight steam was actually coming out when I parked. Not good. Nothing coming from out of the radiator though. Wierd thing is, I drove it from AZ to UT without any issue. Fan clutch was replaced & radiator was flushed previously. Any ideas?
10-24-2015, 12:07 AM
R/T93

Mine bubbled this summer at 10-11k ft when I had like 100 dead butterflies blocking my rad...
10-24-2015, 12:12 AM
Chris@Rvengeperformance

I wonder if your radiator cap is bad?
10-24-2015, 12:36 AM
CoopKill

^^ ^^ ^^ ^^ ^^ ^^ ^^ ^^ ^^ ^^ ^^ ^^ ^^
10-24-2015, 10:06 AM
stealthee

Yeah, bad rad cap would not let the system hold enough pressure. It could also lead to coolant evaporating past the seal.
10-24-2015, 09:07 PM
ICPREY

Quote:

Originally Posted by IPD

Not my 3/s, but probably similar for any/all cars. Fluid in my overflow tank is boiling. I've heard it bubbling previously, but tonight steam was actually coming out when I parked. Not good. Nothing coming from out of the radiator though. Wierd thing is, I drove it from AZ to UT without any issue. Fan clutch was replaced & radiator was flushed previously. Any ideas?

Same thing happened to my wife's Ford Taurus, it ended up being a head gasket issue. Start with the simple stuff like the radiator cap first.
10-25-2015, 10:17 AM
HLxDrummer

I'd check/replace the rad cap, check your coolant's water/antifreeze ratio, and look at the oil/coolant for signs of contamination first. Was your temperature gauge going up at all?