it may not be much help, but doing coolant flushes with this Lisle coolant funnel tool were extremely successful for me and allows you to get a very solid "burp" out of the system. $20 on amazon and i'll never be without one. might be worth doing it this way if you plan to yank the thermostat and have to refill the system anyway.
![[Image: 24970_in3_572F569B424C0.jpg]](http://www.lislecorp.com/uploads/products/24970_in3_572F569B424C0.jpg)
2010 Civic Si
2019 4Runner TRD Off-Road
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Past: 03 Xterra SE 4x4 | 05 Impreza 2.5RS | 99.5 A4 Quattro 1.8T | 01 Accord EX | 90 Maxima GXE | 96 Explorer XLT
2019 4Runner TRD Off-Road
--------------------------
Past: 03 Xterra SE 4x4 | 05 Impreza 2.5RS | 99.5 A4 Quattro 1.8T | 01 Accord EX | 90 Maxima GXE | 96 Explorer XLT