My car was losing coolant, but there is no leak?

Question

A week ago my car overheated so i let it cool off then filled the coolant. i drove it around to see if it'd overheat again and it slowly did. when i stopped i heard popping til i turned off the car and there was a river of coolant flowing away from my vehicle. My car has been at the shop for a week now and he said he ran a pressure test and there was no leak. whats wrong with my car?

Answer 1

check the following

1) water pump

2) head gaskets

3) the timing belt/chain cover

4) are you overflowing

5) are you getting enough flow through the radiator

6) are you getting enough airflow (fan)

7) dirty radiator (outside)

those pressure test are meant of the radiator and surrounding areas

Answer 2

the coolant is probably bubbling out the overflow then.

could be fans not coming on, radiator cap, radiator blocked, worn out waterpump.  i'd start with a radiator cleanout.

*if the head gasket was leaking the system wouldn't have held pressure when the mechanic did a pressure test.

Answer 3

I agree

sounds like it could be the head gasket

Answer 4

if there,s no leak, then it must be a head gasket. coolant is going through the combustion chamber and going out the tailpipe.

Answer 5

If it is overheating which causes it to overflow thats where your coolant is going your thermostat may be sticking thats what happen to me try replaceing the thermostat only cost a few bucks did your mechanic check for a cracked head or gasket

Answer 6

could be thermostat,head gasket,bad heater core

Answer 7

Car already in shop,should ask the shop,they have the car to check,better me than them?I do not think so.I am only guessing,you know..!

Answer 8

Possibly water pump has failed or your thermostat is not opening allowing the car to overheat.  If it is the water pump the water would drain from the overflow.  Usually if its the thermostat, no hot water would make it back to the radiator to be cooled and cause the car to overheat.  There would be no water except from a hose bursting from the extreme pressure of the heated water and possibly an intake or head gasket going bad also from the heat and water pressure.

Answer 9

You have a blown head gasket.  Very expensive.  Coolant is leaking in to places in the engine it shouldn't.