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Old 05-16-11, 03:59 PM   #1
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Default Bleeder Valve

I am in the process of "burping" the cooling system as I hear fluid gushing sound behind the dash when accelarating....im pretty sure there is air in the cooling system so need to bleed it out...

Can't seem to locate the 17mm bolt bleeder valve...can someone point it out please? pics will be cool if not good description please.

Its a '98 LS4....which bolt from this photo?

http://www.flickr.com/photos/landar/...57622886015670
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Old 05-16-11, 10:49 PM   #2
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I'd say it's the one the thumb is on. However, I've heard 98-00's don't have a bleeder bolt.

To properly get bleed/burp the air out of the coolant system, follow these instructions:

1) Remove the tank cap
2) Set heater temp on high (85)
3) Let engine warm up to normal operating temp (to open the thermostat)
4) Rev engine between 2000 and 2500 RPM for 5 minutes (at some point you may see some fluid "blurp" (technical term) out as the air escapes)
5) Turn off engine and let engine cool
6) Add fluid to the tank as coolant is drawn back into radiator (don't let tank get empty)
7) When engine is totally cool, add fluid to full level
8) Replace cap

Oh, and make sure your thermostat has the bleeder/jiggle valve at the 12 o'clock position.
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Old 05-17-11, 12:49 AM   #3
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check this post from member stage3. his is a GS400 but it's the same for all 98-00 LS/GS400s.
http://www.clublexus.com/forums/1907063-post6.html

its' the inverted hex bolt on the throttle body, you need to remove the engine cover to get to it.
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Old 05-17-11, 09:03 AM   #4
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Thank you guys! greatly appreciate the assistace
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Old 05-17-11, 10:11 PM   #5
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Ah, that would make it the top center bolt in the pic linked in the OP.
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300, 98, bleed, bleeder, blleeder, coolant, cooling, es, es300, gs400, lexus, radiator, system, thermastate, valve

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