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Old 08-28-2011, 01:32 AM   #1
simkid5614
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2002 SL2
Default Coolant loss, Not visible.

Well, at 100k My radiator cracked.. Replaced it plus upper and lower hoses. Not an auto so no trans lines. The other night was checking fluids. Oil coolant etc. Coolant tank was near empty. And i was like WTF!? So i started hunting for leaks. Found none so added coolant, changed the reservoir cap and away i went, Rechecked tonight while it was under pressure slight loss, but nothing too big. So looked again, manifold seems to be alright, no wetness as far as i can see from the WP, thermostat(see pic) I'm not quite sure is right, not getting over 30 Hwy MPG.. got 25 this last trip..

This is a 35 Mile trip at 65mph


Havent checked the Heater core. but anywhere else left?
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2002 SL2 115k "Whisper" No leaks!! :) 115 and going strong..
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Old 08-28-2011, 02:32 AM   #2
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Location: Pacifica by San Francisco – 5sp – Original engine rebuild as documented by this site @ 177K due to high oil consumption. Mpgs back to 40+. Car runs smooth, like a top. Now at 220k. Successful rebuild !
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1996 SL2
Default Re: Coolant loss, Not visible.

I would run the car in the driveway with the throttle body air intake ducting removed. Let the fan auto cycle a few times. If there are no leaks that you can see or smell, then reach over to the throttle mechanism and turn it by hand to rev the engine. You donít have to rev it to really high rpms and when you do pay attention to the area behind the intake manifold. This is how I found my leak. The pressure created when rev-ing the engine caused a coolant squirt out the back of the intake manifold. This is how I found my leak.
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Old 08-28-2011, 02:51 AM   #3
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Default Re: Coolant loss, Not visible.

Should try now, car doesnt get hot enough at idle to have the fan cycle on, without the A/C running. I don't want it to be the manifold.. I dont really know how to get that damn fix in there, Or much less can be without my car for more than a week. I drive this beast hard, so it wouldnt surprise me if it was. The radiator cracked from too high RPM's after awhile.. Will check, brb


EDIT: Just ran it, got to temp in photo, revved.. and still nada. Dry as a bone.
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2002 SL2 115k "Whisper" No leaks!! :) 115 and going strong..

Last edited by simkid5614; 08-28-2011 at 03:04 AM.
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Old 08-28-2011, 03:52 AM   #4
ehunter
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Location: Pacifica by San Francisco – 5sp – Original engine rebuild as documented by this site @ 177K due to high oil consumption. Mpgs back to 40+. Car runs smooth, like a top. Now at 220k. Successful rebuild !
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1996 SL2
Default Re: Coolant loss, Not visible.

if your fan does not kick on after about 20 minutes of idle then you have other issues that need fixing as well. if so, your thermostat is stuck open and needs replacement. Buy only a 195 degree thermostat and accept no substitutes.

The new thermostat will help you locate where your leak is coming from.

BTW - Many times your nose can tell you which side of the car the leak is coming from. If you do have a leak, most people will be able to smell it.
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Old 08-28-2011, 04:21 AM   #5
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Default Re: Coolant loss, Not visible.

I did catch a whiff on the battery side, but was shortly dispatched... Didnt smell it again.. so, Will test on monday when i don't have to work, probably do the t stat anyway, It doesnt hurt and it may improve my fuel mileage
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Old 08-28-2011, 02:18 PM   #6
ehunter
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Location: Pacifica by San Francisco – 5sp – Original engine rebuild as documented by this site @ 177K due to high oil consumption. Mpgs back to 40+. Car runs smooth, like a top. Now at 220k. Successful rebuild !
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1996 SL2
Default Re: Coolant loss, Not visible.

Without a new tstat the chance of you chasing your own tail for a while on this leak is likely. Have been monkeying around with this issue for some time already?
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Old 08-29-2011, 12:31 AM   #7
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Default Re: Coolant loss, Not visible.

No just found out it was low this week.
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