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Bad radiator cap
#1

I have experienced a bad cap leaking because seal was deteriorated and weak spring would not hold pressure. But this is a first. head gasket blown and had to move the car about 100 feet into the bay. Opened the hood and antifreeze leaking out of every hose joint. So I know it exceeded over 16lbs of pressure and the cap should have opened and bubbled out the overflow. Top hose was solid as a rock. Has release lever but did nothing. Slowly removed cap and cold antifreeze blows everywhere
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#2

Radiator could be compromised as well, not to mention stock oil cooler if you still have it.
Geoff - 85 XR DD back in service - with a vengeance!
"Beyond the Palace, Hemi powered drones scream down the boulevard" - Bruce Springsteen
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#3

Ouch - my new aluminum radiator! have aftermarket oil cooler but did not see any signs of water in the oil or oil floating on top the anti freeze in the bucket
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#4

It would be nice to figure out how high the pressure got. Did you see any high temperature excursions on your temp gauge before you noticed the problem?
If we can peg the peak temperature seen, and know the glycol%, in principle we can look up the vapor pressure from the phase diagram. But I guess it's possible/likely temperature peaked after a shutdown, when there was no way to see it.
Geoff - 85 XR DD back in service - with a vengeance!
"Beyond the Palace, Hemi powered drones scream down the boulevard" - Bruce Springsteen
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#5

Short drive home it was bubbling out the overflow.  But did not notice any other leaks. Checked and saw nothing before I moved it into the garage about 50 feet drive the next morning. In the garage that's when I felt the hose and saw all the leaks at the hose joints. temperature 40-45 F  Chilly morning in Ohio.  would say run time at 3 minutes that morning
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#6

So the overflow did function to some extent. If temp didn't get into the 200s I guess pressure couldn't have been that high. I wonder if you have a thermostat issue.
Geoff - 85 XR DD back in service - with a vengeance!
"Beyond the Palace, Hemi powered drones scream down the boulevard" - Bruce Springsteen
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#7

(03-28-2020, 12:22 PM)Hemi Wrote:  If temp didn't get into the 200's, I guess pressure couldn't have been that high.  

My WAG (guess) is that temp had nothing to do with the pressure buildup in Joe's situation, Geoff. I suspect the blown h/gask was the major culprit.....bad enough to allow lots of combustion pressure into the cooling system. In which case (and without sufficient relief past the radiator cap), it apparently led to extremely high cooling system pressure almost immediately.  [Image: confused0024.gif]
Placerville, California
(former)  2.3T '78 Courier ~ (current)  2.3T '87 Ranger & '82 Mazda B2200 (smog-exempt diseasel truck)
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#8

Yeah, I agree that the leaky HG was able to force more combustion gases/pressure into the system than the overflow to expel so it built up over time even if everything was working as intended (other than the HG).
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#9

Yes, head gasket went and caused the initial problem. Just confused that the overflow was bubbling out when I got home but the following morning the cap didn't release the pressure when I put it in the garage
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#10

Pulling the lever on yer cap shoulda released any residual cooling-system pressure into the recovery bottle, Joe. If it didn't, the passageway between the rad neck and the bottle is plugged, OR - more likely - you need a new "lever cap". [Image: confused0024.gif]
Placerville, California
(former)  2.3T '78 Courier ~ (current)  2.3T '87 Ranger & '82 Mazda B2200 (smog-exempt diseasel truck)
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