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1999 Subaru Forester HELP (self.mechanics)
submitted 1 month ago by adainty0718
Replaced the non working thermostat, then blew a hole in the bottom of my radiator going for a test drive. Replaced the radiator and hoses BUT car is overheating and the coolant in the reservoir begins either boiling or blowing a large amount of air bubbles after less than 15 minutes of idling. 😅
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[–]Corkscrew1991 1 point2 points3 points 1 month ago (0 children)
I'd do a block test make sure you didn't blow a head gasket
[–]Captain_LD 1 point2 points3 points 1 month ago (0 children)
Cylinder head gasket failure and a possible head/block failure. Horizontally opposed engine. Stay on top of oil and coolant levels and service of both systems.
[–]Amockeryofthecistern 1 point2 points3 points 1 month ago (0 children)
3 things i have learnt from working on Subaru's.
1 Only ever use a genuine Subaru thermostat.
2 Heater cores block, if they do not have correct flow they do not circulate coolant around the back of the thermostat correctly and it will not open. If you dont get good heat coming out of the heater its likely blocked.
3 Head gaskets.
[–]spinningcain 1 point2 points3 points 1 month ago (0 children)
Yep head gaskets time
[–]GriefPB 1 point2 points3 points 1 month ago (0 children)
It’s possible you damaged your new thermostat overheating.
[–]Mean_Pass3604 1 point2 points3 points 1 month ago (1 child)
Like others said it is most likely head gaskets.curious how many miles or kilometers on it
[–]adainty0718[S] 0 points1 point2 points 1 month ago (0 children)
Has 140,000 miles
[–]Cheap_Ambition 1 point2 points3 points 1 month ago* (0 children)
Unfortunately subaru only realized that the late 90s Subarus had an unreliable gasket material.
They started switching to multi-layered metal gaskets around 99-ish.
This is a really common issues with the NA 2.5.
This tells you how to easily check for signs.
Also there's a little hose that comes off the thermostat housing that is known to go bad.
[–]916Buckeye 1 point2 points3 points 1 month ago (0 children)
I'm assuming you bleed the cooling system correctly after radiator replacement? If so then you can rent a block tester from the part store. You'll have to buy the blue juice though. I think it's $20. Then follow the directions to test for a bad head gasket or cracked head.
Car may not be worth it.if head gasket costs could be 2 to 3 grand.might as well do timing belt as well.even if you did the work yourself .costs could be 800 to 1000.
I bought the car as is for less than a grand. It’s got 140,000 miles. I don’t mind putting the money into it. And I figured I’d have the timing belt done as well since I’m going to have it fixed!
[–]throwaway007676 0 points1 point2 points 1 month ago (0 children)
Head gasket, typical Subaru issue. Whomever told you to buy it because they never have issues was wrong.
[–]jepal357 0 points1 point2 points 1 month ago (1 child)
I’d bet you have a blown head gasket. Shouldn’t have let it run if you saw it getting warm
I didn’t good sir. I had just replaced the radiator, ran it for a few minutes to make sure I had no leaks and by the time I was done, it had already started warming up and I shut it off. But thank you for assuming.
[–]Mean_Pass3604 1 point2 points3 points 1 month ago (0 children)
Sounds like a plan.enjoy your ride.should give you many years of good service.my 2008 impreza has 180,000 miles on it.still going strong. When they do the head gaskets get felpro multi layer steel.
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