anybody on here know anything?

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Jul 7, 2011 | 07:23 PM

RPD_Vette84

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From: Van Nuys

anybody on here know anything?

ive tried on several different sections and sites and blah blah blah. anyways im havin a coolin issue with my 5.3l. its only spewing out steam threw the steam vent went its warm causin in to build to much pressure and heat up. its not acting like a blown head gasket i.e. no smoke it doesnt overheat on the street, doesnt **** out of the overflow, and no milkshake. ive tried all the different methods of burping the car. like... lifting the front, filling from the upper rad hose, drive the car around, shake it, vacuum pumping the system. i heard that these motors get airlockedbut gees for 2 weeks? i just got it back from my mechanic and they couldnt find anything.

any of you guys have a clue?

Jul 7, 2011 | 07:29 PM

KILLER-LS1

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From: Orange County, CA

i always run the motor with the cap OFF, and heater on full blast for at least 15min. sit there and constantly fill it up as it spills over. just keep it full. youll see little air bubbles coming out.

This is assuming you dont have a cracked head or something. Have you done a cooling system pressure test?

Jul 7, 2011 | 08:53 PM

RPD_Vette84

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From: Van Nuys

i did the running with the cap off thing several thousand times already.

i did a pressure test and it held pressure fine.

Jul 7, 2011 | 08:59 PM

SMALLBLOCKHERO

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From: Buffalo, NY

not for nothing but.. when was the last time you changed the thermostat? my car did exactly this and the stat was stuck in one spot open 20%. i changed it and it was forever better. just food for thought... good luck.

Jul 7, 2011 | 08:59 PM

RPD_Vette84

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From: Van Nuys

also i pulled a bunch of stuff off right now. is there supposed to be any passage on the upper part of the block on the drivers side where the waterpump goes?

Jul 7, 2011 | 09:00 PM

RPD_Vette84

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From: Van Nuys

tried 2 thermostats, no thermostat, 2 waterpumps, 2 radiator caps

Last edited by RPD_Vette84; Jul 7, 2011 at 09:32 PM.

Jul 7, 2011 | 09:12 PM

RPD_Vette84

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From: Van Nuys

could it be that my timing is *14 degrees from idle to full throttle?

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Jul 7, 2011 | 11:59 PM

mannyman84

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From: Hawthorne CA

Yep u do. So does it overheat at all or is it just steam? What radiator are u using?

Jul 8, 2011 | 12:21 AM

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LS1Z28

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From: Lake Elsinore

What is the pressure rating of the cap you are using? The newer engines require a higher pressure cap rating 18lbs +

Jul 8, 2011 | 08:42 AM

#11

RPD_Vette84

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From: Van Nuys

it pushes steam. the radiator cap is 18lbs. bought it for a 01 z28.

think i have the same issue this guy had.
http://www.ls1truck.com/forums/lsx-t...verado-14.html

Jul 8, 2011 | 11:18 AM

#12

XpEdItIoUs

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From: Phoenix, AZ

I would use a "block chek" just to make sure you don't have a combustion leak going into the cooling system.

Jul 8, 2011 | 01:49 PM

#13

ur jlus

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From: Fontana, California

Sounds like a problem I had. I ended up buying a radiator. Afterwards I found the drain plug was bad because of me draining the radiator.

Jul 8, 2011 | 03:16 PM

#14

LS1Z28

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From: Lake Elsinore

Which heads are on the motor? The 706 heads Were made in India by Castec and are notorious for cracking. I had to replace them on my suburban at 75000 miles. The replacements are 862's I have a set for sale with about 8000 miles on them if you have to replace them.

Jul 8, 2011 | 04:37 PM

#15

RPD_Vette84

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From: Van Nuys

I have the factory 862's. Does anybody read anymore. I pretty much found out what it is. There's no coolant passage from the head through the block to the waterpump. Its either clogged or if the previous owner had the heads off he put the head gasket on backwards.

Thanx