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Old 11-12-2012, 01:10 PM   #1
90Bronco79
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over heating issue

Ok first I have replaced the water pump, stat, and heater core. I topped off the heater core when installed / reinstalled, stat opens and closes as the upper hose get warm to hot then back. I am in the process of burping the system after replacing the stat but every time i turn off motor fluid gushes out of the rad like a geyser. I don't know what else to do at this point. Any suggestions would be nice. Yes I have searched
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Old 11-12-2012, 01:12 PM   #2
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Coolant leaking out is NOT "overheating". A cap is like $6. Read this:

http://www.fourdoorbronco.com/board/...ead.php?t=5230
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Old 11-12-2012, 01:17 PM   #3
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with the cap on the temp rises to just before the line for normal with the cap off while burping just after shutting down to let it cool it gushes out there is no leakage other wise.

Yes the cap is the next on the list to replace when my wife gets back from the gym.
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Old 11-12-2012, 01:32 PM   #4
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Go to Napa and buy a "Stat" thermostat for around $6.00 they're good quality, I just replaced mine, if you're having issues how old is the fan clutch......?


Good Luck ~
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Old 11-12-2012, 01:34 PM   #5
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The stat is brand new and the fan clutch is most likely stock how would i know if the clutch is bad?
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Old 11-12-2012, 02:05 PM   #6
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with the cap on the temp rises to just before the line for normal with the cap off while burping just after shutting down to let it cool it gushes out there is no leakage other wise.

Yes the cap is the next on the list to replace when my wife gets back from the gym.
that's normal behavior on some vehicles. Some don't do that, some do. what i always did after the stat opened a few times was raise the engine speed with one hand (this will suck the coolant level down), top off the radiator, cap the radiator, and THEN shut the engine down, letting it cool with the system sealed.

then check and top-off once fully cooled down.
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New nuts are in the plan.
"Kids, they see the good in everything and through their eyes, they open ours." - Hank Davis
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Old 11-12-2012, 02:10 PM   #7
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I really hate working with the cooling system give me a mechanical issue any day. I am still getting bubbles out so how many times should could it take to purge all the air out of the system.
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Old 11-12-2012, 02:13 PM   #8
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cooling systems are cake.

Get it as close to full as you can and seal it up. if you daily drive it, check it every morning for 3-5 days. it will purge itself once you get it 90% of the way there.
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New nuts are in the plan.
"Kids, they see the good in everything and through their eyes, they open ours." - Hank Davis
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Old 11-12-2012, 02:18 PM   #9
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Thanks I really appreciate the help.
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Old 11-12-2012, 02:22 PM   #10
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Age for one thing if you don't know how old it is, the coil spring in the center and overall condition. I just changed mine since it's been on there for 9 years since I've owned the BKO and probably the original one, sometimes rountine maintainance replacement is in order if parts are old.....http://www.oreillyauto.com/site/c/de...3389&ppt=C0331

You can tell if your temp needle is moving up towards H where the fan clutch may not be doing it's job.

Shop around for a better price on the internet, I'm sure you can do better..

Good Luck ~
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Old 11-12-2012, 02:32 PM   #11
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Read this caption:



...AND the link I posted above.
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Old 11-12-2012, 02:33 PM   #12
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when cold, you should be able to spin the fan with relative ease by hand (WITH THE ENGINE OFF), and once at operating temperature the fan should be almost impossible to turn by hand (WITH ENGINE OFF).

if it doesn't follow either of those, it's bad.
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New nuts are in the plan.
"Kids, they see the good in everything and through their eyes, they open ours." - Hank Davis
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Old 11-12-2012, 02:39 PM   #13
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I'll check that out too. Added fluid after the drop from purging and filled the res I hope this works going to take if for a drive later will let you know the out come. BTW I have read both thanks bookmarked both.
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Old 11-13-2012, 01:17 PM   #14
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Driving into work this morning i noticed that when under power the temp gague would go down and then when i let off the gas it would climb to the high side of the Normal range. Still have very weak heat but it runs just not sure if the pump is going since its less then a year old.
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Old 11-13-2012, 10:58 PM   #15
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If it was run in the higher temps before the repairs your temp sensor could have been damaged, if you have an ohm meter you can check your sensor, but I usually replace them if the vehicle was over heated to any extreme, as they can give faulty readings and have you second guessing your repairs.
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Old 11-14-2012, 01:45 AM   #16
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If it was run in the higher temps before the repairs your temp sensor could have been damaged...
No, it couldn't. There is no temperature at which a FSB engine will run, shut down, & run again without repairs that would damage any sensor.
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Old 11-14-2012, 07:42 AM   #17
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No, it couldn't. There is no temperature at which a FSB engine will run, shut down, & run again without repairs that would damage any sensor.
And by "repairs" you mean... heads resurfacing and new gaskets or other more involved than that of which he did already? Even if you are correct, could the sensor be bad anyway, why did he replace the water pump in the first place and heater core and thermostat?
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Old 11-14-2012, 11:41 PM   #18
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You're not making any sense. You said the sender was damaged by heat. Where are you reading that his engine ever got hot? What temperature do you think it would have to get to for the sender to be damaged?
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Old 11-15-2012, 02:56 AM   #19
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Originally Posted by BronCummin5.9 View Post
If it was run in the higher temps before the repairs your temp sensor could have been damaged, if you have an ohm meter you can check your sensor, but I usually replace them if the vehicle was over heated to any extreme, as they can give faulty readings and have you second guessing your repairs.
I didn't say the sensor was damaged ...
It doesn't say the engine was run hot it said parts were replaced... BUt why were they replaced ya reckon?
As for temperatures it takes to destroy a sensor.... I wouldn't know, I am not making sens...or..
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Old 11-15-2012, 03:09 AM   #20
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may i jump in with an over heating question? my bronco over-heated this summer. coolant was overflowing the resevoire. I kept her parked for the summer due to mechanical issues. As I drove my Bronco to the shop howevfer (in mild temps) I heard a gurgling near the passanger's side firewall where the hose/valve are and steam or smoke come out of my vents into the cab. Could this be a simple thermostat as I had initially estimated this summer, or is there a bigger issue like the heater core? thanks!
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