Question about Toyota 4Runner

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Coolant system holding pressure

I was told my coolant system was holding pressure from a Toyota dealership, 2 days later my radiator cracked. does that have anything to do with that? and what would cause the pressure in the coolant system?

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  • Toyota Master
  • 641 Answers

Holding pressure is a good thing. When it doesn't hold pressure worry. The cooling system Is a close system and when the coolant gets hot it actually expands creating pressure. Once it reaches a certain temperature the thermostat opens allowing hot coolant back into the radiator to cool and if there is to much pressure in the radiator a valve on the cap allows the coolant into the reservoir. When hot there's pressure which is why you should never open a cooling system when hot.

Posted on Apr 18, 2014

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6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: Cooling System Pressure Build up, but No engine overheat, No Water in oil

Found hints on VolkswagenTalk.com suggesting to check inside engine oil cap. If you find foam (some call it ice-cream) Cylinder head gasket is blown. Went checked, and actually found ice-cream on it. Credit to Hillbill, Man you Rock!

I am now doing pressure test, but no wapping has been detected..problem was just in its early stages. on my way to get a metal gasket, and replace. Cheerz!

Posted on Jun 16, 2008

  • 5 Answers

SOURCE: Oil leaking into coolant system

pull your spark plugs and see if coolant is inside the cylinder. If so you have a blown head gasket. also you can start the car (make sure its cold) and then pop the cap off of the radiator if it shots like a fountain then you have a blown head gasket (watch out though, does this due to a blow off of pressure into the coolant system). you might also think about replacing the water pump if you have a blown head gasket. Since you have it open it's not a bad idea, it could be the reason why the gasket is blown if that's the case.

Posted on Oct 16, 2008

stormbrewin
  • 426 Answers

SOURCE: Coolant filling up overflow bottle

You may need to ask AAA to put a radiator pressure tester on the resevoir bottle and pump it up to operating pressure(Pressure cap rating) and see if it over pressurises while it is running at operating temp,rev engine up and down and watch what the testers pressure readings do,it should move up and down in sync with the water pump.If the pressure keeps building i would have to believe that combustion chamber gases are over pressurising your cooling system.Also test the pressure cap is functioning within factory specs.

Posted on Oct 30, 2008

  • 4 Answers

SOURCE: 2001 cadillac catera: oil in coolant?

The Problem, My friend, is a leaking oil cooler. this item is mounted, inside the engine, under the intake manifold. The cooler or the connections are bad. Coolant flows through the cooler, if it brakes then the oil will contaminate your coolant and make a mess.!! Have it checked. Must times is the seals at the pipe to cooler flange connector. will need new seals.. Hope this helps.

Posted on Jan 16, 2009

emissionwiz
  • 76164 Answers

SOURCE: 92 Toyota Camry, antifreeze leaking no leak found

have you had the undercarriage inspected for white stains from coolant, rust stains if your system is corroded? How many miles? has the water pump ever been replaced, that would be my guess, water pumps leak while the eng is running and the hot engine evaporates the coolant, so in many cases none on the ground. Also have the system pressure tested by a shop and put on a rack to check for signs of leaking under the car.

Posted on Aug 25, 2009

Testimonial: "Thank you for your answer. I have not changed the water pump since I bought the car 5 yrs ago. I will check that."

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Overheating


Doesn't sound like it ran hot enough or long enough to crack or warp the head. If there is a crack, the engine will continue to overheat. If a warped head, car would probably run rough, the affected cylinders would likely have little or no compression, there would be a noticeable miss, and overheating would continue.
Why the low coolant? It's a sealed system, so should never have to add coolant, other than a small loss from evaporation in the overflow tank. Monitor the level closely for the next few days. Note the level in the overflow tank to see if it drops over time. Leaks can be external anywhere in the coolant system-engine, radiator, hoses, heater core- or internal in the engine-head gasket failures can cause coolant in the cylinders (white smoke out the exhaust), or coolant in the oil (oil will have a milky brown look to it), or oil in the coolant (will see traces of oil in the radiator).
A couple of tests may be called for. A pressure test of the coolant system will check if the system holds pressure as it should-about 15 psi. If pressure does not hold, there is a leak somewhere. Water pumps usually leak through the weep hole when they fail. A radiator leak would show up when pressure is applied. If pressure does hold, check if you have a good radiator cap-the cap is what seals the system so pressure will maintain. Coolant under pressure raises it's boiling point by about 10 degrees, so is critical to keep the system under pressure.
If you suspect further problems-losing coolant or continued overheating-then have the chemical test done to check for exhaust gasses in the coolant. Basically a check if the head gasket is good, a simple test done at the radiator cap opening with a special fluid that changes color if hydrocarbons are present in the cooling system.
Or you could have a compression test of the cylinders to check the internal mechanical condition-not only tells you if head gasket is good, also tells you a lot about engine condition-even,. balanced, good compression in all cylinders translates into good power output-rings are good, valves are sealing good, all systems go.
The cooling system: water pump, thermostat, radiator, hoses, heater core and hoses, radiator cap, overflow tank, and the cooling fans and associated wiring. Make sure everything is working right and you'll be good to go.

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