coolant pressure relief
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Burning Brakes
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From: My Own Private Idaho
coolant pressure relief
If pressure builds due to sludge-induced restricted flow, where is the pressure relieved? Overflow tank? Wouldn't the tank overflow before hoses blew?
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Re: coolant pressure relief (tailgunner)
:cheers: Coolant pressure builds in response to temperature!
If you have enough sludge in your coolant system to create a pressure increase as a result of the waterpump trying to move the coolant, you have a system that must be severely overheating and a water pump that would have to be a positive displacement pump!
"sludge" can build up and cause reduced flow and overheating due to the reduced heat to air transfer capability, but the radiator cap will "asuming you have a working one" blow off once it's pressure capacity is exceeded!
What'd your problem, tell us more
:seeya
:steering:
If you have enough sludge in your coolant system to create a pressure increase as a result of the waterpump trying to move the coolant, you have a system that must be severely overheating and a water pump that would have to be a positive displacement pump!
"sludge" can build up and cause reduced flow and overheating due to the reduced heat to air transfer capability, but the radiator cap will "asuming you have a working one" blow off once it's pressure capacity is exceeded!
What'd your problem, tell us more
:seeya
:steering:
Thread Starter
Burning Brakes
Joined: Oct 2000
Posts: 897
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From: My Own Private Idaho
Re: coolant pressure relief (Q1KSLVR)
I have blown two coolant hoses in the last 2 months. Both of them as I stepped hard on the gas. Wooossh, white smoke behind me. I panicked the first time thinking headgasket, but it was just a hose.
The hoses do have 95k on them, but I noticed some sludge up under the lip of the main coolant tank. It kind of looks like oil (brown sludge), but I dont see any 'crap' just coolant under the hood when the hoses blew, so I guess there is not alot of this stuff.
The rest of the story is that I go through a qt of oil every 1500 miles or so but dont see any smoke when I start up or get on it, and I have no leaks. SO I wondered if I had the oil going into the coolant and that was the brown stuff and that as the oil entered the coolant and created sludge the pressure was blowing my hoses.
Hopefully its just a coincidence that I have recently blown the old hoses, and the sludge is normal build up in the cap.
Does that explain my strange question? :D
The hoses do have 95k on them, but I noticed some sludge up under the lip of the main coolant tank. It kind of looks like oil (brown sludge), but I dont see any 'crap' just coolant under the hood when the hoses blew, so I guess there is not alot of this stuff.
The rest of the story is that I go through a qt of oil every 1500 miles or so but dont see any smoke when I start up or get on it, and I have no leaks. SO I wondered if I had the oil going into the coolant and that was the brown stuff and that as the oil entered the coolant and created sludge the pressure was blowing my hoses.
Hopefully its just a coincidence that I have recently blown the old hoses, and the sludge is normal build up in the cap.
Does that explain my strange question? :D
Le Mans Master
Joined: Feb 2000
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From: Kempner Texas
Re: coolant pressure relief (tailgunner)
As wel know, oil and water won't mix, so if oil is getting into the coolant, when you take off the radiator cap you should see indication of it floating on top of the coolant.
Your radiator cap should open in response to excessive pressure, something around 15 to 16 lbs., but surely soon enough to prevent a hose - in good condition and properly clamped - from blowing.
With the stat open and the radiator cap off, do you see good circulation?
Jake
Your radiator cap should open in response to excessive pressure, something around 15 to 16 lbs., but surely soon enough to prevent a hose - in good condition and properly clamped - from blowing.
With the stat open and the radiator cap off, do you see good circulation?
Jake
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Re: coolant pressure relief (tailgunner)
:cheers:
Please take this in a positive vane!
But if you are planning on keeping this car, you might want to consider a more rigourus maintenance schedule.
Coolant should be flushed and changed every other year at least, oil changed every 3000 miles, all hoses and belts every four to five years regardless of mileage unles the mileage is high. This is just MHO
:D
:seeya
:steering:
Please take this in a positive vane!
But if you are planning on keeping this car, you might want to consider a more rigourus maintenance schedule.
Coolant should be flushed and changed every other year at least, oil changed every 3000 miles, all hoses and belts every four to five years regardless of mileage unles the mileage is high. This is just MHO
:D
:seeya
:steering:
