Question about 1999 Pontiac Grand Prix

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Need too flush radiator on 1999 grand prix se 3.1 liter where is the drain pug. thanks tom

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Is on the bottom left sice of the radiator.

Posted on Sep 15, 2010

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How to flush coolant on 2004 grand prix


  • Move your badass w-body (a.k.a. Pontiac Grand Prix) to a level area and set the parking brake. Pop the hood and touch the radiator. If it's warm let it cool before you continue.
  • Twist the radiator cap one full turn (Remember to be careful because even when radiators are cool they can still erupt coolant)
  • Place any type of container (bucket [but has to be able to hold 2 gallons]) underneath the radiator and blow the drain plug. (The drain plug on your Grand Prix is on the driver's side bottom of the radiator facing the engine.)
  • Loosen the drain plug and let the old coolant to drain completely. (You may need a wrench to loosen the drain plug)
  • Dispose the old coolant in a sealable container (The coolant is very toxic to people and pets, so you gotta be careful)
  • Shut the radiator drain plug and fill the radiator with water.
  • Run car for a little bit and repeat the process again. (Let car cool, and drain water)
  • Close the drain plug and fill the radiator with fresh coolant until it's about an inch from overflowing. (DO NOT USE ORANGE DEX COOLANT IT IS HARMFUL FOR YOUR HEADGAKETS) You will need 3 gallons of coolant (SE, GT, GT1, GT2, GTP, GTP Comp G.) and 4 for the GXP model. Be sure to check the drain plug for any leakage.
  • Start your car and turn the heating system to high. Allow the car to keep running until the cooling fan turns on twice. After that happens, switch off the engine and check the coolant level. If it went down, add more coolant. If not, put the radiator cap back on and close the hood.

Feb 20, 2014 | Cars & Trucks

1 Answer

How to back flush heater core 2007 grand prix


drain coolant system locate heater cores hoses going through firewall you need to buy the radiator flush kit at any auto parts stores. remove heater cores hoses from one end or buy extra long heater hoses same size as heater core hoses in vechicle at auto parts store use the flush kit when you flush through one of the heater core hoses let the other hose drain in a drain pan when you use home garden hose use low water pressure dont use garden hose to the max or you will rupture heater core. your best bet let radiator shop flush whole coolant system. because heater cores hoses are in a tight spot.make sure engine off if you just going to flush out heater core only .after flushing heater core good time to replace heater core hoses.if job too hard or complicated let radiator shop flush out radiator the engine block and heater core because if radiator stopped up or engine block stopped up the gunk and rust will reenter plug up heater core.if you tight on money you can flush out your own radiator.drain out radiator using large drain pan. remove top radiator hose and remove bottom radiator hoses connect to water pump.use garden hose with flush kit part with water pressure not too high put garden hose to top radiator hose run water until clear water run out bottom radiator hose in drain pan,the flush out engine block remove thermostat.if you had another spare thermostat housing with RTV SILICONE SEALANT THAT HAS SET UP INSTALL THERMOSTAT HOUSING BACK TO ENGINE WITHOUT THERMOSTAT FLUSH OUT THE ENGINE BLOCK, WHEN DONE INSTALL NEW THERMOSTAT THEN INSTALL ORIGINAL THERMOSTAT HOUSING WITH NEW ORING WHICH YOU BUY AT DEALERSHIP.IF ALL SOUND COMPLICATED LET RADIATOR SHOP FLUSH OUT COOLANT SYSTEM.

Nov 27, 2012 | 2003 Pontiac Grand Prix

1 Answer

95 Grand Prix


Remove top cover over radiator and then upper bracket bolts, drain system and disconnect hoses and cooler lines from ****** (may need special tool) and the radiator just lifts out.

Jun 15, 2012 | 1995 Pontiac Grand Prix

1 Answer

1999 grand prix gt overheating. Changed thermostat, water pump, upper radiator hose. Please help!


does the upper and lower hoses seem to be the same temp when car begins to overheat? ore the radiator cooling fans coming on before the car overheats? did you pressure test the cooling system and radiator cap? also may want to remove the lower hose and flush the radiator. is the check engine light on and does it run bad?

Aug 03, 2011 | 1999 Pontiac Grand Prix

1 Answer

How do i flush my radiator on my 1999 pontiac grand prix 3.1L engine?


first you take off the hose on the left side bottom of your radiator then unscrew the top cap. (drains) then you plug your water hose into the bottom hose and screw in our top cap for 30mins to an hour (flush). re connect hose and fill.

May 15, 2011 | Pontiac Grand Prix Cars & Trucks

1 Answer

Hey guys, i am no mechanic not even close, but my pontiac grand prix se 4-dr automatic with 6cyl, has been acting strange when i first start it and drive it maybe 30 min the low coolent light comes on and...


The first things to do are: 1. Make sure the radiator is full when the engine is cool (check the fluid in the radiator as well as the overflow tank). 2. Make sure the thermostat is working. 3. Have the lower intake manifold gasket checked. The Grand Prix SE came with a 3.1L engine (standard) and these engines are famous for lower intake manifold gasket problems.

Nov 18, 2010 | 1999 Pontiac Grand Prix

1 Answer

How tjo do a radiator flush in a 1999 Grand AM SE


The best way to flush it is with a flush machine.But,if you don't have one then follow these steps. 1. Put a catch pan underneath,where you will be draining the fluid. 2. loosen the petcock at the bottom of the radiator. If you don't have access to it,then remove the lower radiator hose and run the car for a minute to let the rest of the fluid drain. 3. With the fluid drained out,tighten up the petcock or the hose and put a bottle of radiator flush chemical in it.Prestone makes this and you can get it at a parts store. 4. Add the contents of the bottle and fill the rest up with water. 5. Run vehicle for 10 minutes and drain. 6. Loosen the 2 pressure relief valves.1 is located on the coolant tube running from the passenger side to the drivers side.The other one is located on the thermostat tube.They are both copper in color and you will need a 10 mm wrench and a 6 mm or 7 mm wrench to loosen them up. 7. Add the recommended fluid,usually Dex-Cool for that year,until it comes out of the relief valves.Tighten the valves back up (be careful,they break easily) and run the vehicle till at proper temperature. If it seems to get a little on the hot side, Loosen the relief valve until the air bubbles are gone and top off the fluid. Please remember to dispose of the fluid properly in accordance with the law.

Oct 06, 2010 | 2001 Pontiac Grand Am SE

1 Answer

I have a 99 Pontiac grand prix and was wondering how to drain the radiator I can't find the drain ****


the drain fitting is usually on the bottom of the tank,near the lower radiator hose. it is acceptable to remove lower hose connection to drain.

Oct 13, 2009 | 1999 Pontiac Grand Prix

1 Answer

Can't find radiator drainage plug on 1997 Pontiac Grand Prix


It is not there. You must remove the lower radiator hose to drain the radiator. Hope this helps. Good luck

Apr 27, 2009 | 1997 Pontiac Grand Prix

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