I been having problems with the cooling system in my car. It started with the radiator, I replaced it, then the water pump, then the termostat. I have replaced the termostat at lest 3 times in the past 3 months. Now I my car is liking coolant, I cheked all the hoses, the water pump, the termostat housing and also the radiator and I can't find were is coming from. Any sugestions??

I been having problems with the cooling system in my car. It started with the radiator, I replaced it, then the water pump, then the termostat. I have replaced the termostat at lest 3 times in the past 3 months. Now I my car is liking coolant, I cheked all the hoses, the water pump, the termostat housing and also the radiator and I can't find were is coming from. Any sugestions??

If you can't find where it's 'coming from' you better look where it is 'going to'. Your headgasket might be leaking small amounts of coolant and burning it off. If one of your plugs looks like it's been steam cleaned it's a good bet that might be the source of coolant loss. Does your car puff white smoke at first start-up in the morning. Another thing you might try is pressurizing your system with a pressure bleeder such as Motive and check for leaks or see if it can hold the charge for any length of time. Hope you find it.

Thank you for tips, I thoght the headgasket could be the problem too, I would the check the sparkplus and also I'll try the pressure blender to see what's going on.

Are you having overheating problems? Occasional overheats and an inexplicable loss of coolant could well be a symptom of a failed head gasket. One of the head gasket failure modes is a leak of gas into the cooling system. This may or may not be associated with a leak of coolant into a cylinder or the crankcase. If this is happening enough air can collect in the head to cause and over temp indication, usually only at low engine speeds or at idle. The pressure will eventually get great enought to cause the cap to lift and vent coolant out the overflow tube. For a small leak that may only happen at speed and it won't leave any evidence of where the coolant went.

This problem can be diagnosed in a crude way by coating the inside of the overflow tube with chalk. The next time you see a loss of coolant the chalk will be washed away if fluid is venting. It can also be diagnosed in the shop by pressurizing each cylinder in turn with 150-180psi for a few minutes and watching the cooling system pressure. A rise in cooling system pressure means a leak from a cylinder into the cooling jacket. If a cold test is negative it needs to be repeated on a hot engine.