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Old 02-02-2013, 12:36 PM   #1
Focuslu86
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how can i pressure test my cooling system

I been having a coolant leak with my ford focus 2001 zx3! and I am trying to figure out where the leak is coming from. I have replaced a water pump, thermostat and thermostat housing, upper radiator hose since they were leaking from there (i used a dye to pin point those leaks). I still have coolant leaking because i see my reseirvoir is less and less coolant every time! how can i pressure test the cooling system? what tool can i use to figure if the pressure is ok....?


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Old 02-02-2013, 12:50 PM   #2
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If you haven't purchased a new cap yet, it might be time. When those caps fault, they will bleed off the system before reaching critical pressure- it comes out that overflow hose, but only when you're driving or the engine is hot. Drive around until the engine is warm with a full radiator, and then pop the hood. I've been doing it like that for years. You should hear or see something that gives you a clue.

Where is the coolant residue showing up? If you're getting coolant on the top of the engine, it might be the crossover pipe that is the problem. You'll know soon if it is, those tend to bust wide open. Another method I use is waiting until the engine is cool, then squeezing hoses and listening for whistling.

Pressure testing of radiators is usually done with the radiator removed.
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Old 02-02-2013, 12:55 PM   #3
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You can easily make a pressure testing kit with a garden sprayer, an old cap from a wrecker, and an air pressure regulator. But if you have no coolant dripping or coolant traces from the engine then maybe the heater core is leaking?
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Old 02-02-2013, 01:56 PM   #4
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I been having a coolant leak with my ford focus 2001 zx3! and I am trying to figure out where the leak is coming from. I have replaced a water pump, thermostat and thermostat housing, upper radiator hose since they were leaking from there (i used a dye to pin point those leaks). I still have coolant leaking because i see my reseirvoir is less and less coolant every time! how can i pressure test the cooling system? what tool can i use to figure if the pressure is ok....?
thanks for the reply! i will look into that then...so i should hear a hissing sound from the reservoir cap then? right?
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Old 02-02-2013, 06:56 PM   #5
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If you have a buddy that's a refrigeration guy.....what we do is put our guages on the syatem and put a dye in. Allow the system to run while you use the car for a couple of days and then check the piping over with a blacklight at night. The leak will show up like a sore thumb.
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