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1 25th January 20:47
roy batty
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Posts: 1
Default Coolant temp outta control after using radiator stop-leak


In the same 1999 Ram Van with the 360 engine, after I replaced some
really filthy coolant, and then put in 2 containers of Gunk brand
stop-leak (which seems to have worked), I found the temperature suddenly
going sky-high shortly after starting up. (yes, I put the bottom hose
back on) Coolant level is right to the top, but when you put the heat
on, nothing but room temp air comes out of the panel vents, even though
the coolant temp is close to 250.

And the engine temp gets out of control within 5 minutes, so I have to
shut it down.

Did the stop-leak crap clog the thermostat so there's no circulation at
all? Clog the radiator?

Belt is on and turning the alternator, voltmeter is normal (14-ish).

Sheared water pump driveshaft?

This one's got me worried.
--
Facts are a therapy of limited usefulness
in cases of advanced delusion.

-Michael Kinsley
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2 25th January 20:47
transurgeon
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Default Coolant temp outta control after using radiator stop-leak


thermostat clogged with crap (stop-leak)

or radiator is full of it

or it's full of air right under the thermostat

fact: I have seen this on Buick 231 V-6's, after overhaul...........the
engine will sit there and literally melt down because there was an air
bubble in the intake, and the thermostat wasn't immersed in water and
wouldn't open

ALWAYS drill a 1/16" (0.0625" for those of you in Decimal Land, 1.5875 mm
for you folks in Metric-LaLaLand) thru the metal part of the thermostat to
give the air an escape path......................
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3 25th January 20:47
carl saiyed
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Default Coolant temp outta control after using radiator stop-leak


I agree with Surgeon. That crap is clogging the t-stat or radiator.

Carl
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4 25th January 20:47
roy batty
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Posts: 1
Default Coolant temp outta control after using radiator stop-leak


Damn, lesson learned, I guess. I should have lived with the leak (it was
very minor) until I could afford to have it fixed properly.

Replacing the thermostat is far more attractive than replacing the
radiator, so is there some kind of antidote to this poison? Any way to
get it out? If it's frigged the radiator, is the radiator history?

Thanks for the advice, guys. I'm an idiot. Learn from me.

--
Facts are a therapy of limited usefulness
in cases of advanced delusion.

-Michael Kinsley
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5 25th January 20:48
joe
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Default Coolant temp outta control after using radiator stop-leak


Hey Roy, if you learned something it wasn't a total waste. Unless you
can have the rad flushed and fixed, it's toast. Make sure you flush
the entire cooling system to get that crap out of there.

Obviously, your best (and most expensive) bet is to go with a new rad.
If you've flushed everything else out, it shouldn't be a problem.
Also, go with a brand new thermo. What's that cost, around $5? No
biggie. And don't put anything but water or antifreeze/coolant in the
rad. 2 cents.

Joe
Black '03 Dakota 5.9 R/T CC
Calypso Green '93 Mustang 5.0 hatch with a few goodies
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6 25th January 20:48
transurgeon
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Default Coolant temp outta control after using radiator stop-leak


generally, if a radiator is leaking, it's also limed up (at least in these
parts) to the point that boiling it out will open up even more leaks

best to bite the bullet and get a new one.........I'd never buy anything
except a Modine
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7 25th January 20:48
budd cochran
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Default Coolant temp outta control after using radiator stop-leak


Roy,

My ex-wife ruined a less than 2 year old radiator and heater core with stop
leak in the 72 Charger we had.

All because she didn't want to tell me her kid brother had got mad and poked
the radiator with a small screwdriver.

I'll only use stop leak if I cannot get the vehicle to a radiator shop.

Budd
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8 26th January 02:08
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Default Coolant temp outta control after using radiator stop-leak


And then follow the directions. One can may be just fine, but two is too much.
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