i have just installed new radiator and refilled it with new coolant but whenever i drive the car the coolant level risen up in the reservoir and never gets back again to the radiator when the car cools down also there are bubbles in the reservoir so i think there is a trapped air in the system how can i bleed that air?
You do not really bleed the radiator. Once the car cools down completely, open the radiator and add coolant to top it off. After next drive, repeat the process. Eventually the radiator should stay full after the car cools down.
Another thing could be that you have some small leak on the hose from radiator to the overflow tank. The fluid goes into the tank fine, but when it cools down, air is sucked in through that leak instead of coolant. The fluid is not pressurized when it goes to overflow tank so you may not see any fluid leaking.
You HAVE to bleed the system ! That's how it's done :
1- While the car is cold, open the radiator cap
2- Add coolant in radiator until it's full
3- Start the car with the cap off and rev the engine to 2,500 RPM for 5 minutes
4- The coolant might drop so you will need to put more coolant
5- Race the engine for another 2 minutes, you will eventually see the coolant bubbling : put the radiator cap back on
6- Race the engine for another 5 minutes and turn the car off
7- Let the car cool down and open the radiator cap
8- Add coolant if it dropped again
9- Add coolant to the overflow reservoir to the MAX line
That's how you properly bleed your cooling system.
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2001 Toyota Corolla 5-M/T (1ZZ-FE)
1999 Toyota Tercel 5-M/T (5E-FE)
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"What's the blood type of a Honda Civic driver ? Type-R" -expertmax
kinda what he said ^^^ when i first bought my corolla last month when i drained and changed the coolant i just filled up the radiator to the neck, left the cap off and let the car idle for a minute or two and watched the bubbles spew up then once it stopped i filled the reservoir to the low line and was finished
i have already done all your advises but still the coolant does not return again to the radiator when the car is cold so is it the right thing to leave the reservoir coolant level at minimum when the car is cold cause i always filll it it to maximum level?also do i have to flush my systemto solve this problem?
If you fill the overflow tank to maximum when the car is cold, the coolant will just flow out of the reservoir and on the street.
When the coolant warms up, the fluid expands and goes to the reservoir. If the reservoir is already full when cold, the fluid has nowhere to go.
I usually keep the level about an inch above the low-mark when cold. When the engine warms up, especially on the highway, the level rises to about 3/4 of the reservoir. Then when the cars cools down, the fluid is sucked back into the radiator and the level in the reservoir drops down again.
Make sure that the connection from radiator to the reservoir is air tight.
i checked every thing in the car there is no water traces in the oil or oil traces in the water also spark plugs looks fine so i dont think i have a blown head gasket i also filled the reservoir to the minimum mark the car gets to the operating temperature and the fluid still reaches the maximum mark and never return when the car gets cold what to do its driving me crazy?
Did you check the hose that goes from the radiator to the reservoir?
Disconnect it from the radiator and remove with the reservoir cap still attached to the hose. You should have two hoses connected to the reservoir cap. One from the radiator and one that reaches down to the bottom of the reservoir. Rinse the hoses with water, plug one end with your finger and try to blow air through the hose. You should not be able to blow air. If you can, then there is a leak somewhere and air is sucked back into the radiator instead of coolant.
The outer diameter of the hose is about 1 inch, which is a little less than half of the diameter of the hose between the engine and the radiator.
The point here is that the rubber which the hose is made of, should be some 3mm thick or so. Thus, the difference between inner and outer diameter of the hose should be around 6mm
Otherwise the hose will be too flexible and as speedy25 said, it will collapse (as if you pinched it) when the fluid is sucked back.
The outer diameter of the hose is about 1 inch, which is a little less than half of the diameter of the hose between the engine and the radiator.
The point here is that the rubber which the hose is made of, should be some 3mm thick or so. Thus, the difference between inner and outer diameter of the hose should be around 6mm
Otherwise the hose will be too flexible and as speedy25 said, it will collapse (as if you pinched it) when the fluid is sucked back.
but the actual OEM hose equipped with the car that goes from the radiator to the reservoir is very thin maybe quarter of an inch only even the radiator cap neck has a very small and tiny opening to the reservoir so how come that hose to have an inch of outer diamter please attach photos to confirm that hose
I cant get you a photo since I'm out of the US. You can confirm if that hose is OK by sucking on it and seeing if it collapses easily, OR checking when the car has cooled if the hose is flattened or still rounded.
I cant get you a photo since I'm out of the US. You can confirm if that hose is OK by sucking on it and seeing if it collapses easily, OR checking when the car has cooled if the hose is flattened or still rounded.
-SP
the hose that i meant is in this photo with the red arrow pointing to it
its completely air tight and i checked it its very fine also i flushed my system for three times uptill now still no sign for improvement and still when the car cools down the radiator cap blows air and the radiator needs some fluid also the fluid in the reservoir never returns again i dont know what to do else every trip with the car is very annoying i will have to wait for it to cool and add fluid cause the reservoir is not giving me the actual condition or what is happening inside my radiator
I see no mention of a new radiator cap. Every radiator cap has a one way valve on it so it can suck coolant back in the rad. If it's stuck...then the same thing will happen that you're experiencing.
If the cap is weak or bad seal, it will allow bubbles in the coolant tank.
The radiator cap....one of the most overlooked parts of the cooling system.
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Bin wrenchin' on the Yota's since '84
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2000 Tundra SR5 4.7 Ex Cab
2010 Camry LE 2.5 Cheers!
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