Question about 1996 Pontiac Grand Am

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How to back flush 96 Grand Am coolant system?

It's a closed system and I can't figure out how to safely back flush it. Pretty sure it's clogged up because it keeps overheating despite new water pump and thermostat. Please help!

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  • Pontiac Master
  • 2,122 Answers

Hi Eric, Before you back flush have the pressure radiator cap inspected together with the cooling fan operation. A defect there will result in over heating. To back flush, detach the cabin heater pipes and open the radiator return pipe and adjust the cabin climate control to fully hot. Attach a hose pipe so that water runs opposite to the normal circulation and turn on the flow. Afterwards when refilling remember to open the air bleeder, replace coolant and run water into the system until all air is expelled from the system. Close up and test run. Keep in mind that air in the cooling system will also cause overheating. Regards John

Posted on Jul 21, 2013

  • Eric Herman Jul 21, 2013

    Thanks John. Unless I am looking at this wrong, I cannot find the heater pipes! I think theyr'e actually under the engine but covered with the frame and a welded cover from the bottom, so I can't even get to it without lifting the engine out. Is this the case on this model? Any help anyone can give is great because the guy who was supposed to do this job ruined this person's other vehicle and I'm not a pro so I don't want to be in this position also.

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Posted on Jan 02, 2017

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How to drain and flush the radiator on my '96 jaguar XJ6


Hello
Most effective way is as follows
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Overheating


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-Make sure the radiator's fins are not clog. This is the biggest problem that the Mechanic can't figure out.
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This will take care the problem.

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My car overheated and leaked coolant everywhere once i shut it off.. i just got my water pump replaced back in april i believe so i'm pretty sure it's not that should i just flush the old coolant out and...


Did you have the thermostat replaced when they did the water pump, as this might be stuck closed and preventing circulation of the water and overheating.....

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Were you having this problem prior to having the coolant system flushed?

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Do you have any "check engine" lights?

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