Question about 2003 Pontiac Grand Prix

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How to back flush heater core 2007 grand prix

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  • Pontiac Master
  • 14,036 Answers

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.

Posted on Nov 27, 2012

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Posted on Jan 02, 2017

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Ajkill
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SOURCE: How do you remove the

Please click on this link:

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c15280090f6d


good luck....

Posted on Sep 10, 2008

emissionwiz
  • 76164 Answers

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

  • 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

  • 454 Answers

SOURCE: How do replace heater core in 2002 Pontiac Gran Prix

i do believe you have to take the passengers side dash apart behind the glove compartment. go to autozone and get a manual or go to the library and check the chiltons manual. this is not an easy job. how bad is the leak? if its not bad these heater cores are made of all aluminum. i would buy a bottle of that radiator additive and see if that takes care of the problem first. it only cost about 5 bucks a bottle and it may permanantly fix your problem.

Posted on Aug 13, 2009

weekspena
  • 375 Answers

SOURCE: how to change heater core on 2007 grand prix

If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing

  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

Posted on Jan 11, 2011

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1 Answer

How do i remove dash to get to heater core on a 07 grand prix gt?


Hey Monica, I did look it up you can find it in full detail at autozone library (its all free) no spam ever , just log in and list your vehicle go to repair guide and then to heating and a/c , I hope this helped you , if it did please let me know by checking box below (helpful ) thanks.
Woody

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How to flush a heater core in a pontiac grand prix 2002


If you have warm air on one side and cool on the other, you've a situation with the vent flaps. But to backflush the core, take both hoses off the core and run a garden hose to the outlet side going towards the water pump. This will flush it.

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clogged heater core get a coolant flush tee from any auto parts store install in heater hose and flush it for an hour... hopefully your heater core isn't leaking

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make sure the engine is getting to operating temp (195f) you may need the heater core "flushed" and coolant replaced, usually flushing the core will fix that IF the air temp doors are working correctly.

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My in heater in a 2007 grand prix doesnt work the air blows but isnt hot temperture gauge looks fine an have changed out thermostat


You have a plugged up heater core. Try pulling the heater hoses of where they go into the firewall, put a garden hose with a spray nozzle in one hose and gently flush the system out. you will need to pull both heater hoses off to do this.

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clogged heater core very pop prob. check both hoses to firewall from back of engine pass side to make sure they are equal tmep if not it is a bad heater core you can flush these by removing the hoses and blowing them out with air or a garden hose also check to see if you hear a door closing in the vents when switched from hot to cold if you do it is safe to say itis a heater core

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Have you checked the coolant level? If that checks out ok... With the engine fully warmed up touch the heater core hoses where they go into the fire wall (about the center of the firewall). They both should be pretty hot to the touch. You'll likely find one hot and one warm. If this is the case flushing the heater core will likely get your heat blowing out hot again.

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2002 grand prix, will not blow hot air, engine heats up fine and cooling system checks ok.


With the engine warmed up feel the heater lines going into the firewall. You will probably find that one is very hot and the other only look warm or even cold. If this is the case the heater core needs to be flushed. With the engine cold remove the hoses at a convenient location and back flush the heater core. Reconnect the lines and warm the engine back up with the heat on.

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Jan 04, 2010 | 2001 Pontiac Grand Prix

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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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