akaziggy Posted March 9, 2017 Share Posted March 9, 2017 last week on the freeway my temp spiked to redline. 9 times out of 10 it's a head gasket. Here's the story: 09 LGT. 25k miles ago, the heads went (a common thing with my motor). the heads were replaced (not resurfaced. replaced). 5k miles later, throws rod. I'm already neck deep, so i suck it up and put in a new (reman'd) block. Been running like a top since -- until 3 days ago. What we've already tried: -replaced the thermostat -flushed out radiator Temp is still spiking. Not to redline, but it's getting hot. Anybody here have any other suggestions that come short of tearing out heads/checking seals on block/spending my entire tax refund on it??? Link to comment Share on other sites More sharing options...
MilesA Posted March 9, 2017 Share Posted March 9, 2017 Are you positive you got all the air bled out of the cooling system? It can cause some "anomalous behavior", to say the least. Sounds like you replaced the thermostat and/or radiator cap recently? Did you use the OEM parts for those? Link to comment Share on other sites More sharing options...
akaziggy Posted March 9, 2017 Author Share Posted March 9, 2017 Are you positive you got all the air bled out of the cooling system? It can cause some "anomalous behavior", to say the least. Sounds like you replaced the thermostat and/or radiator cap recently? Did you use the OEM parts for those? yup. every inch of hose and every container has been burped. every part is NOT from the dealer, but they check out... Link to comment Share on other sites More sharing options...
Darth SpecB Posted March 9, 2017 Share Posted March 9, 2017 Also check your water pump. Oem is better. Sent from my SAMSUNG-SM-G900A using Tapatalk Link to comment Share on other sites More sharing options...
akaziggy Posted March 9, 2017 Author Share Posted March 9, 2017 Also check your water pump. Oem is better. Sent from my SAMSUNG-SM-G900A using Tapatalk the water pump was replaced when the new heads went in. that part came right from the dealer... Link to comment Share on other sites More sharing options...
MilesA Posted March 10, 2017 Share Posted March 10, 2017 Is there some pattern to the temp spiking such as happening only at low speed, in traffic, high speed, climbing hills, etc.? Link to comment Share on other sites More sharing options...
Max Capacity Posted March 10, 2017 Share Posted March 10, 2017 To late now, but did you use ARP head studs ? 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
Darth SpecB Posted March 10, 2017 Share Posted March 10, 2017 I would also check your fans for operation. Mine recently stopped working so I will check the relay and ground connection to the fans. Sent from my SAMSUNG-SM-G900A using Tapatalk Link to comment Share on other sites More sharing options...
akaziggy Posted March 10, 2017 Author Share Posted March 10, 2017 thanks for responses, guys. Miles: the main issue is freeway speed. i can drive it around town, and it's fine-but once i set the cruise at 70, it's hot. Darth: the fan is working overtime. it's working, for sure... Max: i'm sure i didn't. what are ARP studs? aftermarket thing?? Link to comment Share on other sites More sharing options...
MilesA Posted March 10, 2017 Share Posted March 10, 2017 The good news is you are getting some cooling and it is predictable when the overheating happens. The symptoms suggest it is not getting enough flow through the radiator. Is it possible something is blocking airflow to the radiator? The first thing I would try is to use the OEM thermostat. Non-OEM thermostats have been known to cause similar issues, evidently many of them don't flow enough. The second thing would be the radiator itself. Replacement radiators can be very inexpensive and that preemptively deals with the issue of our radiators cracking and or separating at the end tanks when they get older. True, your radiator is not that old, but when you've tried everything else... TYC 2778 costs about $75, appears to be same as Koyorad A13091 about $110. Radiator replacement is not too difficult. This would be a good time to put on new coolant hoses and clamps if you haven't already done that. Link to comment Share on other sites More sharing options...
MilesA Posted March 12, 2017 Share Posted March 12, 2017 Hey, akaziggy, there was another thread recently that might shed some light: http://legacygt.com/forums/showthread.php/subaru-giving-me-wrong-part-number-radiator-cap-my-car-260690.html?t=260690 See post #11 & 12 for description of symptoms. Link to comment Share on other sites More sharing options...
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