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Old 08-16-2003, 02:23 PM   #1
TimStevens
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Join Date: Mar 2001
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2012 STI, '02 WRX
'91 MR2, '05 Speed Triple

Default Changed coolant - post-op questions!

Ok, changed the coolant on my WRX, and have a couple of questions I was hoping someone could help me with. Apologies if these have been answered, but I didn't have any luck searching, and the repair manual is no help!

1: How the heck do you drain the coolant without getting it all over the floor? The drain hole is right over a cross-member!

2: How many times did you have to run the car and add more coolant to the radiator? We would fill it, run it, fill it again, run it some more, etc. Did that about 5 times and it was still taking more, but the resevoir never went lower than full. Is this normal?

3: Is it normal for the idle to be a little off for awhile after the change? The car still has a loping idle just after the change.

4: Is it normal for the radiator cap and fill hole to look like this?



Looked like a rubber seal had broken and was peeling off to the radiator cap.

Sorry for all the Q's. Thanks in advance for any answers

-tim
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Old 08-16-2003, 03:03 PM   #2
tdxflex
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1. Some people were able to put a hose on that nipple to drain the coolant, but it was too slow for me so I just took the plug out completely and used a small kitchen dish spill mat to try to dump it in my drain pan. It's still a little too messy, I'm going to try something some of this flexible tubing next time to direct it better in the pan.

2. Only 2 times. As I would fill I would burb the radiator hoses, then let the car run without the pressure cap with a funnel and rubber o-ring in place, once the thermostat opened the level went down and filled it up again.

3. The idle I'm not sure, shot in the dark something with air bubbles in your coolant. Mine went back to normal after I was all finished with removing all the air from step 2.

4. The last picture has been happening for everyone who has a painted coolant tank. I wiped down the filler neck as best I could so that those paint chips wouldn't get in the coolant when I flushed my coolant. There's another thread about it from maybe a week ago.
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Old 08-16-2003, 03:33 PM   #3
TimStevens
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'91 MR2, '05 Speed Triple

Default

Thanks, I didn't see the other thread about the painted coolant tank area. I just posted those pictures there, too. Hopefully not too many chips got in, though I did notice some flakes of something in the bucket after I drained the coolant!

I'll run the car a little more and we'll see how the idle does. Thanks for the info
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Old 08-17-2003, 12:42 PM   #4
armand1
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Tim,

After changing coolant, you shouldn't need to run it more than once or twice to get rid of almost all of the air. The key is to really run it (with overflow tank full and radiator cap *on*, of course) for at least 15-20 minutes or so, varying rpm a bit, and letting it cool down at least 20-30 minutes afterward. You want the coolant to heat up so the thermostat opens and sends coolant into the radiator; you also want it to heat up so pressure rises inside, and so the radiator cap can release any gas into the overflow tank (and upon cooldown suck back in liquid coolant).
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Old 08-17-2003, 04:48 PM   #5
TimStevens
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That was my prob. The Subaru Service Manual only says to run it for 5 mins, so that's what we did, but I guess we should run it longer!

Thanks,

-tim
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Old 08-20-2003, 01:12 AM   #6
lucywrx
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You should really consider taking the entire lid off the coolant fill area, you have to remove about 7 screws. 'Cause there is also paint on the inside of this lid, I bet it too is either bubbling on the verge of peeling, if not peeling already. This was the case on my WRX and my friends as well. I removed the paint with just high pressure water from a hose and steel wool. Subaru was really stupid to paint this piece.
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Old 08-20-2003, 07:25 AM   #7
TimStevens
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'91 MR2, '05 Speed Triple

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Thanks, I will. That'll probably be my next project over the next few days now that I've got my new brake pads and rotors in
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