Question on bleeding cooling system - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 06-01-2009, 09:54 PM   eBay Motors  #1 (permalink)
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Question on bleeding cooling system

When bleeding the cooling system through the bleed screw should the engine be running or not?
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Old 06-02-2009, 02:59 PM   eBay Motors  #2 (permalink)
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I have the same Question, also where is the bleed screw??
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Old 06-02-2009, 09:09 PM   eBay Motors  #3 (permalink)
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Yes it should be running. Let it run till its warm then slowly open the screw. When water comes out leave water come out for 15 seconds and you should be good (you wont need to totaly remove the screw)
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Old 06-02-2009, 09:42 PM   eBay Motors  #4 (permalink)
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i never had mine running to bleed it dont think i can with bad head gaskets though
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Old 06-02-2009, 09:45 PM   eBay Motors  #5 (permalink)
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Quote:
Originally Posted by WVRigRat05 View Post
i never had mine running to bleed it dont think i can with bad head gaskets though
It will never bleed out the air with bad head gaskets. Besides, its bad enough to try it, you can cause the bubbles to collapse against each other and quickly damage the head gaskets. Its called cavitation erosion.
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Old 06-02-2009, 09:50 PM   eBay Motors  #6 (permalink)
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i didnt figure you could, i got to get that thing fixed its killin me
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05' Chevy LT LLY CC/SB Blackout Performance built motor/trans/tuned- Gone

"The Blessed Hellride"-08' GMC Sierra SLT CC/SB, 12,000 miles!
Engine-EFI Live, blocked, re routed, air box mod, 3" downpipe, raptor 100 lift pump, amsoil
Trans- Transgo jr. and deep pan
Exhaust- 4" MBRP straight pipe, 5" RBP tip
Suspension- leveled, PAC Brake air bags
Other- Fab fours winch bumper, large fender mod, 17x9 Fuel kranks, 35" Cooper STT's, limo tint, 100 gal. Fuel tank, tool box.
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Old 06-02-2009, 09:52 PM   eBay Motors  #7 (permalink)
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Get it fixed soon as possible. Some people never get it fixed, and it resulted in an expensive repair.
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Old 06-02-2009, 09:58 PM   eBay Motors  #8 (permalink)
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i was going to just replace the motor but now that i got a rig beater im just gonna do heads, gaskets, and studs if thats all it needs i dont drive it now.
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05' Chevy LT LLY CC/SB Blackout Performance built motor/trans/tuned- Gone

"The Blessed Hellride"-08' GMC Sierra SLT CC/SB, 12,000 miles!
Engine-EFI Live, blocked, re routed, air box mod, 3" downpipe, raptor 100 lift pump, amsoil
Trans- Transgo jr. and deep pan
Exhaust- 4" MBRP straight pipe, 5" RBP tip
Suspension- leveled, PAC Brake air bags
Other- Fab fours winch bumper, large fender mod, 17x9 Fuel kranks, 35" Cooper STT's, limo tint, 100 gal. Fuel tank, tool box.
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Old 06-02-2009, 10:00 PM   eBay Motors  #9 (permalink)
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Where is this bleed screw?? I just drained my overflow tank and now trying to get it all back in. Do I need to bleed it
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Old 06-02-2009, 10:04 PM   eBay Motors  #10 (permalink)
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You don't really have to. Most techs just bleed it if the radiator has been drained. I do bleed it if the radiator has been drained but if it's the overflow, I don't even bother to.
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