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Discussion Starter · #1 ·
I brought a Rav4 99' auto last week and 4,5 days later coolant started leaking and a bubbling sound came from under the bonnet. The temperature gauge is in the middle of hot and cold. A few days later, a propeller sound started and is very slow to ezcellor and is going through a whole tank of petrol in 1 1/2 days.
PLEASE HELP!!
 

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With the engine idling, is it blowing bubbles in the coolant recovery tank? Any sweet white smoke out the exhaust?

Sounds like a bad head gasket or head.
 

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The boiling point of water is increased when it is under pressure. When your engine is running, the pressure of the system can be as high as 15 PSI. If the pressure gets higher than this the radiator cap will release the excess.

In a properly working vehicle, the coolant system is sealed, and when the engine is shut down, the pressure will remain in the system, until everything cools to ambient temperature.

In your situation, you already know you have a leak. When the engine shuts down, the pressure drops fairly quickly, and the coolant begins to boil at the reduced pressure. That is the bubbling you hear.

You need to locate the source of the leak. The worst case scenario would be if it was a head gasket. If it is you will have a lot of steam come out of the exhaust along with the sweet smell. You should also look at the oil on the dipstick and see if it looks like curdled milk.

Once those items have been eliminated look for drips under the car, around the rad cap, and along the various rubber hoses. Your radiator could also have a small puncture. Look for wisps of steam everywhere under the hood after turning off the engine.
 
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