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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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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1 Answer

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

Most effective way is as follows
1- Warm your car up
2- Shut off your car
3-Add the flush chemical
4- Run the car for about 15-20 minutes and make sure that you have the heater on
5- shut off the car and give it some time to cool off so that when you open the reservoir cap it will not shoot water out
6- When cooled a little open the clip that is on the radiator pipe (out going circulation.
7- Open the reservoir cap and put a water source to keep the water flowing into the coolant circulation .
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9- Close the water source and shutoff your car
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Apr 15, 2017 | Jaguar Cars & Trucks

1 Answer

How to back flush closed system???

Sorry never buy a car with a closed system... Just doesn' work... They want to rip u off.. Even with a new radiator it needs to be relieved of air, so they make you buy a new one

Feb 07, 2018 | 1996 Pontiac Grand Am

1 Answer


-Make sure the system is not clog. (flush with garden water hose in both direction)
-Make sure the radiator's fins are not clog. This is the biggest problem that the Mechanic can't figure out.
*If the fins are clog, Best thing to clean is use presure washer. Carefull ! Do not aim too closed and angle. You'll damage the fins)

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.....

To check, top the system back up with just water, and run until hot. Switch engine off and feel both radiator hoses, they should be the same temperature, if one is hot and the other cold/lukewarm, the thermostat is stuck closed or partially open.

Oct 01, 2010 | 1999 Jeep Grand Cherokee

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Coolant indicator getting to close to hight!

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

If so, it is likely that your thermostat is sticking.

If not, it is likely that there is an air bubble left in your system from when it was flushed. Most of the time, air bubbles will work themselves out. You'll just have to keep an eye on it and add fluid as needed. If this is the issue, the shop that flushed your coolant system should take care of it for you as part of their service.

Do you have any "check engine" lights?

Hope this helps and good luck!

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