Heat comes and goes....?
#11
12-24-2013 | 01:08 PM
Ok so I did a rad cap test & it doesn't leak any air, I did a compression test on all 6 cylinders and all are above 100 psi. Coolant not mixed with antifreeze, no white smoke! Odds of having a blown head gasket is slim to none right now.
What I got done as far as the cooling system goes is water pump, tstat, hoses, and new coolant.
I bleed the system many times with car on and off,
The temp stays at 180ish and air blows cool (not cold) and then switches back to hot air, the hoses leading to and from the heater core, one is very hot and is just barely warm
What I got done as far as the cooling system goes is water pump, tstat, hoses, and new coolant.
I bleed the system many times with car on and off,
The temp stays at 180ish and air blows cool (not cold) and then switches back to hot air, the hoses leading to and from the heater core, one is very hot and is just barely warm
To only bleed off the air "without" the motor running!
But at operating temp before you Bleed it without the motor running...
#12
12-28-2013 | 01:30 AM
To properly bleed a system I have always been taught to run the engine with the radiator cap off, heat set to maximum but blower on lowest setting, let the coolant burp itself while it warms up a little and fills. Then put the cap back on, and when it's up to full temp / pressure to open the bleed valve over the thermostat.
Once cooled down check coolant levels fill as needed then again repeat the bleeder screw process till it's a stream coming out.
correct me if it's wrong?
Once cooled down check coolant levels fill as needed then again repeat the bleeder screw process till it's a stream coming out.
correct me if it's wrong?
#13
12-28-2013 | 09:38 AM
Joined: Apr 2010
Posts: 12,270
From: Mentor, Ohio
@Habbibie - At this point sounds like you might be doing nothing but chasing an air pocket.
Below are the steps from the GM shop book for the 3400 to properly bleed the air from the system (note, the car is to be flat/level, not raised up).
1. - Car off, open the cooling system bleeder screws.
Important: Use a 50/50 mixture of DEX-COOL antifreeze and deionized water.
2. - Slowly fill the cooling system with a 50/50 coolant mixture.
3. - Close the cooling system bleeder screws.
4. - Install the coolant pressure cap.
5. - Start the engine.
6.- Run the engine at 2,000 - 2,500 RPM until the engine reaches normal operating temperature.
7. - Allow the engine to idle for 3 minutes.
8. - Shut the engine off.
9. - Allow the engine to cool.
10. - Top off the coolant as necessary.
11. - Inspect the concentration of the engine coolant. Using the J 23688 .
12. - Rinse away any excess coolant from the engine and the engine compartment.
13. - Inspect the cooling system for leaks.
Below are the steps from the GM shop book for the 3400 to properly bleed the air from the system (note, the car is to be flat/level, not raised up).
1. - Car off, open the cooling system bleeder screws.
Important: Use a 50/50 mixture of DEX-COOL antifreeze and deionized water.
2. - Slowly fill the cooling system with a 50/50 coolant mixture.
3. - Close the cooling system bleeder screws.
4. - Install the coolant pressure cap.
5. - Start the engine.
6.- Run the engine at 2,000 - 2,500 RPM until the engine reaches normal operating temperature.
7. - Allow the engine to idle for 3 minutes.
8. - Shut the engine off.
9. - Allow the engine to cool.
10. - Top off the coolant as necessary.
11. - Inspect the concentration of the engine coolant. Using the J 23688 .
12. - Rinse away any excess coolant from the engine and the engine compartment.
13. - Inspect the cooling system for leaks.
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