This is topic non ford question about over heating in forum Tech Talk at Northern California Ford Owners  .


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Posted by autumnstang97 (Member # 6111) on :
 
my daily driver GMC jummy S-15 (4.3L Vortech) has been over heating and now its way up there in the redzone...and wont come down to normal op temp. What the hell could it be?...i was thinking it may be the water pump, i checked the thermostat and it looked fine...but i also have a doubt that i mightbe the radiator too...its never been changed and the truck has 137k miles on...so far i've been walking everywhere...so if anyone can give me some tips i'd appreciate it thanks... [burnout]
 
Posted by two-gun kid (Member # 5891) on :
 
quote:
Originally posted by autumnstang97:
my daily driver GMC jummy S-15 (4.3L Vortech) has been over heating and now its way up there in the redzone...and wont come down to normal op temp. What the hell could it be?...i was thinking it may be the water pump, i checked the thermostat and it looked fine...but i also have a doubt that i mightbe the radiator too...its never been changed and the truck has 137k miles on...so far i've been walking everywhere...so if anyone can give me some tips i'd appreciate it thanks... [burnout]
you ever try flushing the cooling system and putting in new coolant?
 
Posted by Blind (Member # 3052) on :
 
change the thermostat and flush the coolant really good using the prestone flush kit from kragen/pepboys/wherever you go.

then fill it with new coolant and bleed the system.


gm used dextron coolant in those things and it clogs and gets fucked up
 
Posted by autumnstang97 (Member # 6111) on :
 
i'll give that a shot...hope it works...thanks...oh yeah how the hell do you bleed the system?...is theier some type of bleed valve for it?...thanks

[ September 11, 2006, 10:20 PM: Message edited by: autumnstang97 ]
 
Posted by Blind (Member # 3052) on :
 
just let the engine idle with the radiator cap off until the thermostat opens and all the air will come gargling out of the radiator cap opening.

it's best to either jack up the front corner with the cap or to park on an incline so that opening is the highest point to give the air the best chance at getting out.
 
Posted by modular (Member # 6599) on :
 
My buddies 96 firebird did have a bleed valve on one of the lines. I doubt flushing the system will help your red zone problem. Does it lose water/ have air bubbles in the radiator, or leak from under the water pump?
 
Posted by autumnstang97 (Member # 6111) on :
 
I've seen airbubbles and steam coming from near the valve cover...could this indicated a blown head gasket or a cracked head?...
 
Posted by 68_428_Fastback (Member # 1482) on :
 
quote:
Originally posted by autumnstang97:
I've seen airbubbles and steam coming from near the valve cover...could this indicated a blown head gasket or a cracked head?...
either or
 
Posted by cummins (Member # 5931) on :
 
Sounds like you need to pressure test the system.
 
Posted by BlownNOSMustang (Member # 158) on :
 
1- Pressure test.2- Change T-Stat.3- Is the radiator clogged?(Runners).4- Does coolant run through the system? If not, Impeller. WP. Good luck.
 




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