i have an 03 wrx with a coolant leak that will only leak once the car starts until it warms up, once car is warm there is no leak. pressure test was done yeilded nothing, new headgaskets from cometic. any ideas? water pump? or which gasket? all stock water pump was not replaced but timing belt and pulley were
Did you purchase a new Gasket for the old water pump? If not that would be a place to start. When you removed the pump in the first place you should have cleaned the old gasket off thoroughly but not abrasively. any notching to the face of your pump will need to be machined out(this is not cheap so i would just buy a new one). never re-use old gaskets, never re-mount without completly removing the old gasket.
Have you had a look underneath the vehicle to see approx. where the leak is coming from?
This might sound silly but ive seen it done before>
When you re-installed the pump did you ensure that all 6 bolts were firmly tightened? 2 of the bolts on the pump are not visible after it is back in place. it is pretty easy to get excited and forget one of them. Maybe re-check your torque.
When you put the old Temp sensor in did you make sure the small ring gasket was replaced? Same as above post. New gaskets/Seals only.
i bought a whole gasket kit when i redid the motor, i will double check those bolts i was pretty excited when i was getting it back together haha, but thank you! i cant really find where its leaking its under the timing belt cover like near bottom rad hose? think its a head gasket?
head bolts were replaced, and it doesnt smoke like at all, very little smoke while starting, just like normal smoke it havent smelled it but its not smoking bad or alot. i really feel like it might be a water pump issue. i have no other head gasket signs, it makes good power, oil is good, and no air the my system.
Sorry bro, i think your stuck checking your torque and possibly re-placing the water pump
Originally Posted by Brockton
Did you use the subaru coolant conditioner?
I thinkyour right, and it was the second gen 2.5's that were recalled to add this conditioner. there were multiple issues regarding not having the additive. im having a hard time finding the exact year though.
HG leaks, Blown coolant passages, Etc. If your interested OP it is just re-branded RADWELD or HOLT's.