LiftedEA81 Posted May 14, 2007 Share Posted May 14, 2007 Like... im wondering if this activity is normal for coolant. Ive had problems with hoses bursting. Im assuming the pressure in my coolant system is building and the cap is not venting it off... but im wondering what could cause the system to build this much pressure in the 1st place. I just got done replacing the 3rd coolant line in 2 weeks, so after I refilled my coolant system, i let the car run and reach operational temperature. Everything seemed normal, until it warmed up and then it seemed to be pushing coolant out of the system instead of sucking it in, or leaving it at a normal level. If I revved the motor it would push coolant out faster, and after letting it idle again i would see it gurgle and then the level would drop. I then add more coolant and repeat the process. It seems if the car idles everything is fine, but if you rev the motor the coolant level rises and the coolant tank overflows... the coolant keeps flowing out of the tank until i let off the gas and it then stops. If the radiator fans kick on, immediately the coolant level drops and then I am forced to refill the coolant tank. Mind you, this is all on a 1993 Turbo Wagon, so the radiator has no cap, the only way to fill the system is through the coolant resivoir. I thought my radiator cap was faulty, so I bought another one. This one has a lever that you pull to vent the system before you remove the cap. It is also rated at 13lbs instead of 16lbs like my old one. So i filled the system, put the cap back on and took the car for a test drive around the block. Didnt go far, but I made sure to flog it as if I were driving on city streets. Getting the revs up into the 4000rpm range. When I got home I removed the cap from the Overflow tank, and lifted the lever on the cap for the resivoir. The level on the overflow tank immediatly started to rise and overflow... then as soon as the pressure had been released I removed the cap on the resivoir and noticed it was real low. So I filled it and as soon as it reached full, the car started to gurgle and the coolant began to overflow from the resivoir. So yeah... i dont know if this is normal or not. But Im sure if its building pressure this fast, driving it 1hr each way from home to work is enough to blow another line. And I kinda expect to be replacing my 4th coolant line next weekend >:\ Whats everyone think? Link to comment Share on other sites More sharing options...
nipper Posted May 14, 2007 Share Posted May 14, 2007 Well it sort of is acting normal but ...... You should have the 16psi cap. http://auto.howstuffworks.com/cooling-system8.htm http://www.2carpros.com/how_does_it_work/cooling.htm http://www.radiatorinfo.com/radtip.html Now that said, does the car run hot? Has it over heated? What condition is the radiator in? The purpose of the cap is to pressurize the system. By pressureizing it you lower the boiling point of the coolant. This allows the coolant to hold more heat. Now a bad thermostat can screw this up. A stuck cap. A blown head gasket. If one coolant line has blown, they should all be replaced, as they are all weak due to age. Link to comment Share on other sites More sharing options...
LiftedEA81 Posted May 14, 2007 Author Share Posted May 14, 2007 Seems like they all have been replaced now. Not sure how many more are on this motor, but i have a feeling i'll find out. Im not gonna put the 16lb cap back on if its faulty. The car doesnt overheat, it doesnt run warm. Only time it runs warm is when it blows a coolant line and all the coolant is drained, then of course, it warms up. Link to comment Share on other sites More sharing options...
nipper Posted May 14, 2007 Share Posted May 14, 2007 Well thats a good thing, then we can rule out a HG issue for now. nipper Link to comment Share on other sites More sharing options...
Skip Posted May 14, 2007 Share Posted May 14, 2007 quote the Nipper "By pressureizing it you lower the boiling point of the coolant." Some new physics or in need of a physic?? http://www.ch.cam.ac.uk/magnus/boil.html Link to comment Share on other sites More sharing options...
nipper Posted May 14, 2007 Share Posted May 14, 2007 quote the Nipper"By pressureizing it you lower the boiling point of the coolant." Some new physics or in need of a physic?? http://www.ch.cam.ac.uk/magnus/boil.html picky. You raise it. you know what i meant (not like the links that i posted dont explain that, though i get the feeling no one reads them) nipper Link to comment Share on other sites More sharing options...
NV Zeno Posted May 14, 2007 Share Posted May 14, 2007 It may be a little premature to rule out the head gasket, or even a cracked head. I had a Celica (20R) many years ago with similar symptoms, turned out to be the head gasket. Never overheated, but took months of going crazy in the Arizona summer heat to finally figure it out. Easy but messy fix, once properly diagnosed:cool: . My 2 bucks Link to comment Share on other sites More sharing options...
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