Question about 2005 Pontiac Grand Prix

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05 grand prix........if it need new heating core, what will bleeding the radiator do...

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Bleeding air out of the system will purge also air out of heater core. Sometimes you may need to add a "flushing tee" (available from an autoparts store) to get some trapped air out of system.

If the air is not removed, if an air pocket is in the heater, you get no heat because coolant cannot move through at an adequate rate to be useful. In other areas it can cause hot spots in the engie that lead to cracked heads, blown head gaskets, or an engine that does not run well.

Posted on Feb 12, 2012

  • ranadahughes Feb 12, 2012

    Your the best! Keep it up

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6ya6ya
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Posted on Jan 02, 2017

emissionwiz
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SOURCE: i want to flush the heater core

Take off the hoses at the bulkhead/firewall that go to te heater core, use a garden hose and back flush the core by forcing water through the smaller of the 2 hose nipples, if the water runs right through then you have a heater air temp control door actuator problem

Posted on Dec 24, 2008

blueextc3221
  • 15935 Answers

SOURCE: cooling system bleeding

Faulty thermostat or water pump.

Posted on Jan 03, 2009

  • 1118 Answers

SOURCE: 2006 pontiac grand prix vary little or no heat

Are you sure you got all the air out of the cooling system? Air pockets are very common problem when you do any work to the cooling system. An air pocket will do what you discribe.

Posted on Mar 18, 2009

  • 14036 Answers

SOURCE: 1999 grand prix, heater core went out. Need help

you are going to need a manual with a diagram.because you going have to remove parts under the hood.you going have to remove floor console.and lower instrument panel insulator. on both sides.

Posted on Jul 15, 2009

  • 1 Answer

SOURCE: 2000 grand prix heating system does not supply hot

The thermostat had failed to the open position. This engine had the resilient seal with an interior grove instead of a flat gasket. The seal fits around the thermostat flange with the flange seated in the groove. The thermostat/seal drop into the well machined in the block. The top of the seal apparently should protrude above the surface of the block so the thermostat housing will squeeze the seal as the housing is tightened in place.
Here's a potential problem that I found. I bought a Murray 7203-192 failsafe thermostat and 2273 seal from O'Reilly. When I assembled the seal on the thermostat and dropped it in the block the seal did not protrude above the block. I'm going to shop for a taller seal before I finish the installation.

Posted on Jan 06, 2010

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Was the thermostat changed? I would suggest replacing the thermostat refill the system with new coolant and purge the air out of the system.

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there should be a plastic value near bottom of radiator on left or right tank although i dont recommend using this because i seen them stick and break when u try to open them your best bet is to remove the lower hose from radiator

On a side note after you refill the system make sure u go through the bleeding procedure to remove all air from cooling system . This motors are notorious for trapping air in system which leads to overheating no heat etc.

to bleed system locate the two bleeders screws (one will be on top of thermostat housing) (other one will be on bypass pipe that comes out of water pump depending on which motor you have you may not have this one )

Fill coolant system start car turn heater on high and let it run working back in forth between the two bleeders opening one at a time until all air is removed add coolant as needed make sure you bleed system until thermostat opens then continue to bleed until all air is removed

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I have a 1995 Pontiac Grand Prix GTP 3.4L DOHC....... The engine is over heating (yes it has coolant in it).... and I had noticed a leak in the coolant so we replaced the radiator (which had a hole in it)...


REPLACE THERMOSTAT TO BE ON THE SAFE SIDE.IF YOU PUT NEW RADIATOR IN MORE LIKELY YOU NEED TO BLEED COOLANT SYSTEM CHECK COOLANT LEVEL WHEN ENGINE COOLS DOWN. YOU HAVE AIR IN COOLANT SYSTEM.AIR WILL EXPEL AND COOLANT LEVEL DROPS ADD MORE COOLANT UNTIL YOU HAVE RIGHT AMOUNT COOLANT IN RADIATOR.DONT DRIVE CAR UNTIL COOLANT SYSTEM BLEED.WHEN THERMOSTAT OPENS TURN OFF ENGINE WAIT A WHILE THEN CHECK COOLANT LEVEL KEEP ADDING UNTIL COOLANT LEVEL STOP DROPPING IN RADIATOR. USE LARGE RAG OVER RADIATOR CAP TO KEEP FROM GETTING SCALDED BUT WAIT UNTIL COOL DOWN ENOUGH SO YOU WONT GET SCALDED.

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2 Answers

No heat in 2005 grand prix - not the thermostat


Most likey cause is the valve that cuts off the hot water from flowing through the heater radiator core in summer. Sometimes this valve is cable operated, but mostly by vacumn servos. Find the offending servo & make sure the vacumn tube is connected and undamaged. If this is ok check its operation and replace if it's not moving the valve.

Mar 17, 2010 | 2005 Pontiac Grand Prix

1 Answer

Why would the car over heat ive change water pump cause it went bad and now the heat isnt working so what could the problm be


You probably need to bleed air out of the cooling system. There may be little brass bleed screws on key high points under the hood. Start the engine (cold), loosen them, remove your radiator cap, and let the water pump work the air to the vents. While you're at it, turn your heat to the hottest setting to circulate coolant through the heater core and flush the air out of there as well. Add coolant as necessary to top it off. When the engine begins to warm up, the coolant will warm up and begin to "grow". Close vents and put cap on. Make sure your overflow tank is filled to "full hot" so that, as the coolant "shrinks" on cool-down, it will pull in coolant and not air. You may need to bleed air off a few times in the future to get it all out but be careful that you don't do it when it's hot because it's easy to get a steam burn.

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Mar 06, 2009 | 2000 Pontiac Grand Am GT

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I want to flush the heater core


Take off the hoses at the bulkhead/firewall that go to te heater core, use a garden hose and back flush the core by forcing water through the smaller of the 2 hose nipples, if the water runs right through then you have a heater air temp control door actuator problem

Dec 24, 2008 | 2005 Pontiac Grand Prix

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Make sure the thermostat is orientated correctly. If it is in upside down it will not open. Also are the radiator tubes clean? If they are clogged you will not get the flow you need through them to bleed off the heat. If that is the case you will need to have the radiator rodded and cored. You also didn't say what year the vehicle is.

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