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K20z3 Leaking coolant from the front of the block.

622 Views 4 Replies 4 Participants Last post by  jordan.fa5
Hey guys, just spent the last week replacing all of the cooling components on the face of my k20z3. (Thermostat, thermostat housing, heater pipe, and thermostat to intake manifold pipe)
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Unfortunately it still leaks from what seems to be behind the thermostat housing, what else could be leaking back there? Water pump? Cracked block? Anyone have a similar issue?
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Note that it only leaks when I drive, no leak during pressure test or at idle. That’s what stumps me.
You sure it’s not coming from your radiator and getting blown on the front of the block?
I know this is a pain but you need to clean the area again to verify and report back.
I had the same exact issue on my k20. Coolant seeping from a micro-crack on the block itself. I ended up replacing the motor with a k24
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