Mitchy Posted December 22, 2019 Share Posted December 22, 2019 Hello all Our 1999 Forester SF is making a noise like gently trickling water at start up, from behind the dash, heard inside the car. The ‘trickle’ increases with engine revs and goes away after a minute or so. It does it every time, and this is a fairly recent situation. There is no apparent external liquid loss nor wet carpet. I’m going to make a closer inspection soon, check coolant levels and burp the system, but wonder if anyone has an idea about this. Stock 2.0 NA Many thanks Quote Link to comment Share on other sites More sharing options...
SUBARU3 Posted December 24, 2019 Share Posted December 24, 2019 Following Quote Link to comment Share on other sites More sharing options...
el_freddo Posted December 24, 2019 Share Posted December 24, 2019 @SUBARU3 try here. This thread is a double post. Cheers Bennie Quote Link to comment Share on other sites More sharing options...
gbhrps Posted December 30, 2019 Share Posted December 30, 2019 Mitchy, I believe you're hearing coolant gurgling through the heater core of the HVAC system because of air bubbles. The fix is to raise the front of the car so that the radiator is higher than the heater core, remove the radiator cap, start the car and run it to normal temperature with the hvac set to maximum heat. Then add 50/50 mixed coolant to the rad as trapped air bubbles burp up through the rad cap opening. Continue until no more bubbles can be seen, and no more coolant can be added. Once all of the air has been burped out, you should no longer hear the trickling noise inside the car. I've been there with a past OBW and this solved the issue. Good Luck! 1 Quote Link to comment Share on other sites More sharing options...
Mitchy Posted December 31, 2019 Author Share Posted December 31, 2019 Ookay Now that I know what this noise is I have burped and now all is good! thanks 1 Quote Link to comment Share on other sites More sharing options...
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