Coolant goes in reservoir but wont go back in rad!

2.5guy · 06-05-2010, 09:16 PM

Ok soo I am at a complete loss...
The 2006 2.5i motor was rebuilt with 2006 sti tri layer head gaskets
New timing belt
New water pump
New Thermostat

so my issue is after about 40 mins of driving keeping it below 3500rpm all the coolant will be over in the res and car will get hot. I pull over take the cap off pour the coolant back into the radiator and its good to go! I changed the Radiator cap and its still doing it..... Even once the motor and coolant cools down it does not suck coolant back into the radiator

If I run the motor at higher rpms it fills the reservoir back up faster

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dstan · 06-05-2010, 10:29 PM

you still have a major head gasket problem, who did the replacement?

burton58 · 06-05-2010, 10:35 PM

radiator plugged up? might need a flush

2.5guy · 06-06-2010, 02:30 AM

I just found out if I run my heat on high it takes alot longer to fill the reservoir.... i'm going to check all the lines to and from the heater core to my rad and to the water pump.
I tried running it with the radiator cap off I did that for like 45 mins but the funnel I was using kept popping off
I tried a compression tester today on it but the loan a tool at advance's was broken wouldn't hold air......

Patrick Olsen · 06-06-2010, 09:59 AM

Quote:

Originally Posted by dstan

you still have a major head gasket problem, who did the replacement?

Based on what you've described I would agree with dstan. Those are the symptoms I've seen on multiple occasions when I've had blown/leaky HGs on my car.

2.5guy · 06-06-2010, 11:49 AM

I was hoping that wasn't the cause.... I will see if I can locate a compression tester see which head is giving me issues

alloutSTI · 06-06-2010, 11:57 AM

what is your water/coolant mixture? 50/50?

2.5guy · 06-06-2010, 01:18 PM

Yup 5050

dcleal · 06-07-2010, 03:58 AM

Did you bleed the cooling system after refill?

06-05-2010, 09:16 PM	#1
2.5guy Scooby Newbie Member#: 226957 Join Date: Oct 2009 Chapter/Region: NESIC Location: Wallingford CT Vehicle: 00 2.5RS Coupe Aspen White	Coolant goes in reservoir but wont go back in rad! Ok soo I am at a complete loss... The 2006 2.5i motor was rebuilt with 2006 sti tri layer head gaskets New timing belt New water pump New Thermostat so my issue is after about 40 mins of driving keeping it below 3500rpm all the coolant will be over in the res and car will get hot. I pull over take the cap off pour the coolant back into the radiator and its good to go! I changed the Radiator cap and its still doing it..... Even once the motor and coolant cools down it does not suck coolant back into the radiator If I run the motor at higher rpms it fills the reservoir back up faster * Registered users of the site do not see these ads.

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06-05-2010, 10:29 PM	#2
dstan Scooby Guru Member#: 120386 Join Date: Jul 2006 Chapter/Region: South East Location: Asheville NC Vehicle: 2000 BRP 2.5RS Coupe Wow the 89 Civic is fast	you still have a major head gasket problem, who did the replacement?

06-05-2010, 10:35 PM	#3
burton58 Scooby Newbie Member#: 115369 Join Date: May 2006 Chapter/Region: Tri-State Location: NJ Vehicle: 2002 WRX's SRP & WRB, RIP to both	radiator plugged up? might need a flush

06-06-2010, 02:30 AM	#4
2.5guy Scooby Newbie Member#: 226957 Join Date: Oct 2009 Chapter/Region: NESIC Location: Wallingford CT Vehicle: 00 2.5RS Coupe Aspen White	I just found out if I run my heat on high it takes alot longer to fill the reservoir.... i'm going to check all the lines to and from the heater core to my rad and to the water pump. I tried running it with the radiator cap off I did that for like 45 mins but the funnel I was using kept popping off I tried a compression tester today on it but the loan a tool at advance's was broken wouldn't hold air......

06-06-2010, 11:49 AM	#6
2.5guy Scooby Newbie Member#: 226957 Join Date: Oct 2009 Chapter/Region: NESIC Location: Wallingford CT Vehicle: 00 2.5RS Coupe Aspen White	I was hoping that wasn't the cause.... I will see if I can locate a compression tester see which head is giving me issues

06-06-2010, 11:57 AM	#7
alloutSTI Scooby Specialist Member#: 241552 Join Date: Mar 2010 Chapter/Region: TXIC Location: El Paso TX Vehicle: 2008 PB EVO X MR SSS Phantom Black Pearl	what is your water/coolant mixture? 50/50?

06-06-2010, 01:18 PM	#8
2.5guy Scooby Newbie Member#: 226957 Join Date: Oct 2009 Chapter/Region: NESIC Location: Wallingford CT Vehicle: 00 2.5RS Coupe Aspen White	Yup 5050

06-07-2010, 03:58 AM	#9
dcleal Scooby Newbie Member#: 178135 Join Date: Apr 2008 Chapter/Region: TXIC Location: Texas Vehicle: 2006 Impreza 2.5i White	Did you bleed the cooling system after refill?