2005 Grand Prix cannot add anymore coolant?

Asked by Familyman2112 Feb 23, 2020 at 12:26 AM about the 2005 Pontiac Grand Prix Base

Question type: Maintenance & Repair

Hello! We have a 2005 Grand Prix. It had no heat and the water pump was
dying a miserable death. I flushed the system to get rid of the dex and cleaned
out everything I could. I then replaced the water pump and thermostat. I filled
the radiator as I have done countless times over my lifetime... I left the cap off
so I could fill as the system needed. After reaching operating temp. I opened
the bleeder on the thermostat. There was no steam or hissing. I opened it a bit
more until coolant started coming out. The coolant level has not appreciably
gone down. I have done this procedure quite a few times over the past three
days. I have not been able to get even two gallons of coolant into the system. I
was concerned there was a block somewhere. I pulled the thermostat housing
off today, the coolant was up to the bottom of the thermostat. I'm at a loss and
would appreciate any suggestions.
Bring me back to the sixties and seventies when cars made sense and were fun
to work on.

3 Answers
41,240

TDolby answered 4 years ago

Does it have heat now and it runs fine? Then your topped off. Today you add coolant from the coolant reservoir. Just draining the radiator requires only a gallon of coolant. You said you flushed the system, how did you remove all the coolant form the block and heater lines and core?

Mark helpful
103,225

KenF answered 4 years ago

"how did you remove all the coolant form the block and heater lines and core?" That's what I'm wondering, you switched from Dex to another type of coolant, you better have every bit of Dex out of there, it does not mix well with other coolants, and draining coolant by opening radiator petcock or removing lower radiator hose is not going to drain engine or heater core completely.

Mark helpful

Familyman2112 answered 4 years ago

I drained the radiator, then removed the upper and lower hoses one at a time, flushed forward and backward with a garden hose (until the water was running clear) I then blew out the water that remained using low air pressure, again, both directions. I removed the high and low sides of the heater core lines and I flushed with water and low pressure air in both directions (some good chunks of dex came out).

Mark helpful

Your Answer:

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