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Unread 03-04-2011   #1 (permalink)
STANGonBLOCKS is offline Rookie

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Default bleed coolant system after draing/flush/fill ?

Do i need to bleed the coolant system after drain/flush/filling it ? Had my cracked intake manifold replaced at a shop, they filled it with new antifreeze. After my test drive on the freeway and a little running around, I let the car cool and I checked the coolant. Coolant was about 3 inches lower than the add coolant bottom arrow on the plastic coolant tank. I also found a piece of black plastic floating in the reservoir(about the size of a pencil eraser) Why was this so low ? Should or did they bleed the coolant system ? Could this have caused damage to my engine by driving it with coolant SO LOW ? Any help would be great.......I dont feel very confident in their job now ..... lol
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Unread 03-04-2011   #2 (permalink)
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when you drain/fill any cooling system, the coolant will always drop a bit after the first ride around. They topped it off and it dropped due to the engine cyling the coolant. Top it off one last time and it'll stay full this time. you dont need to bleed the system, but you do need to burp it. fill it up and pinch the middle of the upper radiator hose, this removes air pockets from the system.
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Unread 03-06-2011   #3 (permalink)
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+1 on above. Dropping coolant level after 1st heat/cool cycle is normal.

Gennerally the 4.6 SOHC motor will self purge the air from the cooling system after a few heat/cool cycles. If not, it almost always means there is a leak or combustion gases are entering the cooling jacket.

The DOHC and V6 OHV engines WILL OVERHEAT if the coolant refill procedures are not followed and all of the air is removed.

The DOHC is especially difficult to remove all of the air from the cooling system. The procedure is time consuming requiring multiple steps and heat/cool cycles. For that reason, the dealer will use the vacuum refilling method (saves time).
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Unread 05-06-2011   #4 (permalink)
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So, pinching the upper hose will remove any bubbles stuck in the heater core?

Quote:
Originally Posted by STANGonBLOCKS View Post
Do i need to bleed the coolant system after drain/flush/filling it ? Had my cracked intake manifold replaced at a shop, they filled it with new antifreeze. After my test drive on the freeway and a little running around, I let the car cool and I checked the coolant. Coolant was about 3 inches lower than the add coolant bottom arrow on the plastic coolant tank. I also found a piece of black plastic floating in the reservoir(about the size of a pencil eraser) Why was this so low ? Should or did they bleed the coolant system ? Could this have caused damage to my engine by driving it with coolant SO LOW ? Any help would be great.......I dont feel very confident in their job now ..... lol
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