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Old 10-21-2013, 08:08 PM   #26
SlimJim8804
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Member#: 241943
Join Date: Mar 2010
Location: NNJ
Vehicle:
2065 Magic Carpet
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Quote:
Originally Posted by mrsmithz9 View Post
Need to triple check how you fill/burp it. Im pretty sure its just air, these cars are damn picky about it.
I'll say so. I changed a thermostat in a bugeye a lil while back and I swear it took 40 minutes to get the system completely burped. (And that was using the highest point as a bleed. Upper rad cap) After 20 minutes of the usual routine, it STILL didn't have heat and the temperature hadn't stabilised. Heat didn't come back until I took it for a short drive around the block, came back and finished burping it. It was a pita.
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Old 10-21-2013, 10:31 PM   #27
04wrxhart
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Member#: 204246
Join Date: Feb 2009
Chapter/Region: NWIC
Location: Vancouver, Wa.
Vehicle:
2004 Impreza WRX
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I dont understand how people have trouble burping subaru's, I've taken my radiator out of my car 3 times since i've had it and never had a problem with air bubbles. I even drove to the dealership (they were the only ones with a lower radiator hose in stock) which is about 8 miles from my old work, changed my hose in the dealership parking lot, no air bubbles. Guess im just lucky, because I hear a lot of horror stories about air bubbles.
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Old 05-15-2022, 10:48 AM   #28
Arpyone
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Member#: 530035
Join Date: May 2022
Location: Western Canada
Vehicle:
2003 WRX

Default Don't assume Head Gaskets with frothy coolant

Old post I know but I had the same problem with a 2003 WRX - violently frothing and puking coolant out the radiator neck when you rev it up. I jumped into replacing the head gaskets and all that entails. Long story short, it wasn't the head gaskets because it did this again after the "fix".

These engines are VERY intolerant of having any air in the system and this seems to be caused by the small upper reservoir. The incoming line to this reservoir is flush with the top cover (that is, it doesn't protrude down below the liquid surface). If there's ANY air space in that upper reservoir, the incoming fluid will entrain the air and cause the whole upper reservoir to be "frothy" (as a comparison, when filling a kiddy pool with a water hose, notice the difference between submerging the hose nozzle under the water versus holding it 1" above the water). This entrained air in turn gets sucked down into the the block and to the water pump. Poor pumping, overheating, overflowing the coolant expansion tank then cooling and drawing in more air, problem worsens... looks a lot like blown head gaskets.

I installed a short pipe nipple on the underside of the upper coolant reservoir inlet line to get the incoming fluid to enter near the bottom of the reservoir and reduce air entrainment if the chamber isn't absolutely full of liquid. This plus lots of venting and topping up the upper reservoir seems to have fixed the problem.

Do a block test before diving into head gaskets!
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