clogged radiator? help w/ flush. - Subaru Forester Owners Forum
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post #1 of 8 (permalink) Old 02-17-2008, 07:32 PM Thread Starter
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clogged radiator? help w/ flush.

Doing the 30K on my wifes, 06 X today.

I drained my coolant, refilled w/ water to flush the radiator, started the car and let it come up to operating temp. The fans came on, upper radiator hose got hot, lower radiator hose is cold, and no fluid comes out of the radiator drain if/when opened.

Do I now have a clogged radiator, or did I not let the car run long enough to get the thermostat to open? I don't have an OBII reader (unless I can use my the married AP from my XT) to know what the actual water temp is, but the heater was on and blowing consistently cold air. This leads me to believe that no coolant is getting into the heater core, and I would think that is related to a clog... is there a solution?

06X 4EAT stock
05XT 5SPD mods - SOLD :(
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post #2 of 8 (permalink) Old 02-18-2008, 05:43 AM
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HI! there , you need to get all the air out the system, , when filling up radiator, let it run and keep rad cap off and keep heater turned on in car , let it heat up and burp out air ,refill when necesssary.After your done and it starts to overheat again usually means you have air in system still and need to get it out.

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post #3 of 8 (permalink) Old 01-11-2009, 03:59 AM
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Exclamation Need to check

Mate you should get down and dirty. poke your head under take off bottom engine (plastic) cover and look around thermostat area. If you can see some obvious signs of cooked coolant around that area you may need to get a new thermostat or even the housing or it could be just the gasket. But also give bottom radiator hose a quick squeeze and listen to your thermostat. When i last drained mine you could hear the thermostat rattling around so i went got new thermostat (slightly lower temp too) gasket and good fluid.
Just my two cents worth see how you go.
Cheers Adam
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post #4 of 8 (permalink) Old 01-11-2009, 08:05 AM
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If one radiator hose is cold and the other is hot, you could try to check the pressure before and after the radiator.

If you find the clog, maybe a backflush to force the crud out in the opposite direction? Just keep a hose ready to hide the coolant that will most likely end up on your driveway...

[optional] use on of your lasers to blast through it all
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post #5 of 8 (permalink) Old 01-11-2009, 11:42 AM Thread Starter
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yeah this was almost a year ago... was a mistaken diagnosis. I simply didn't fill the radiator properly...

LOL about the laser comment ;)

06X 4EAT stock
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post #6 of 8 (permalink) Old 01-11-2009, 03:28 PM
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Originally Posted by badbatzmaru View Post
yeah this was almost a year ago... was a mistaken diagnosis. I simply didn't fill the radiator properly...

LOL about the laser comment ;)
air pockets or not enough fluid??

dm
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post #7 of 8 (permalink) Old 01-11-2009, 03:32 PM
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LOL Didn't check the date...
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post #8 of 8 (permalink) Old 01-11-2009, 08:45 PM Thread Starter
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air pockets or not enough fluid??

dm
not enough fluid

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