Serious coolant leak...Only when It's off - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 03-09-2009
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Serious coolant leak...Only when It's off

Ok, I'm leaking coolant at the back of the engine.
I noticed the leak when i had my rear end jacked up to install my lift, as soon as I had the truck tilting forward it began to drip. It stopped after a few minutes and was done.
I know cars now have drains leading to outside for heater core leaks instead of exploding inside.

On occasion when I start the car I hear a gurgling sound like the heater core filling up. I'm assuming it's draining overnight and when i drive is when it leaks cause I never see a leak this big any other time.

On another note, I just flushed it and god...I've never seen so much crud come out of a radiator. I thought that would fix my slight over heating problem, no, it's still goes up to the last letter sometimes, never goes out of normal though.
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Old 03-09-2009
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Did you replace the thermostat? did you check your coolant freezing point with a hydrometer to ensure it is mixed correctly? did you push on your cap to make sure the spring is working correctly? did you pull on the plunger on the bottom of the cap to make sure that it will allow coolant to return to the radiator?

when you look under the truck on the passenger side, you will see, at the bottom of the heater box, a tube sticking out where the condensation is supposed to lead out, make sure that there is no coolant leaking out of that hole, that would indicate a leaking heater core
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Old 03-09-2009
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Whoa there. Too much info too fast!

I did not replace the thermostat, probably should this truck has been abused by its previous owner
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Old 03-09-2009
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sorry, im about to leave the house for the day so i thought id get it all out there.

definitely replace the thermostat, i would replace the hoses too i had a problem with mine that the lower radiator hose would suck shut.

also maybe replace the cap if it is original and check that heater box drain
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