Question about 1996 Pontiac Grand Am

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I need to know where my heater core hoses run into the firewall on my 1996 pontiac grand am with the v6 and auto transmission

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Center of firewall straight down & above steering gear may have a heat shield should be behind that its a bit of challenge with six cyl good luck

Posted on Sep 09, 2009

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Should be two rubber hoses that connect onto two brass tubes coming out of the firewall inside of the engine compartment near the passenger side of the vehicle. Follow from front part of the engine to where they connect onto the brass tubes. Those should be your heater hoses.

Posted on Sep 09, 2009

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How do I determine why 2003 Pontiac Grand Prix blows no heat with step by step instructions?


The most common reason is the coolant is low.
Check coolant level when vehicle is cool.
If coolant is low start vehicle and fill radiator with coolant.
if coolant was needed high probability there is a leak
look at all cooling system hoses, thermostat housing, all over the engine to try and find leak and repair.

if coolant isnt low, make sure its not really dirty...reddish mud colored. If it is the radiator is probably clogged and needs to be flushed thoroughly..then refilled with coolant.

there will be two heater hoses coming out of firewall..they are connected to the heater core and one hose directs flow of coolant to the heater core, other hose directs flow away from heater core..start vehicle and run until engine is warm then feel each heater hose as close to the firewall as possible..if one hose is hot and other is cool..the heater core is clogged and will probably require replacement. also look in passenger floorboard if coolant is leaking there..heater core requires replacement.

if you check these things and find none of the issues, let me know, and I will tell you what to check next.
Good Luck with it and if you have any.question let me know

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Sep 20, 2015 | Pontiac 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

Heater core bypass


you will not have any heat at all ! so do this. remove the hoses. on firewall side to heater core. go to any auto parts store and buy a coolant flush kit, then use the right size tube to hook hoses back together and clamp them. recheck coolant and that should be it. good-day !

Nov 22, 2011 | 1997 Pontiac Grand Am

1 Answer

I have a l shaped house on my firewall as soon as i poor coolant in the overflow tank it runs out of this house


A hose on the firewall is usually a connection to the heater core behind the firewall (which provides cabin heat when the heater is on). If the hose is leaking, it's a simple and inexpensive procedure to replace it. If the leak is coming from BEHIND the firewall, the heater core probably has a leak and should be replaced.

Jul 06, 2011 | 1997 Pontiac Grand Am

2 Answers

I need instructions on how to bypass a hearter core in a 98 grand am GT. 3.1L


Connect the hoses that go to the firewall-this will bypass the core until you can replace it and can be done with a 5/8" pipe and a couple of clanps.

Jan 24, 2011 | 1998 Pontiac Grand Am

1 Answer

1996 pontiac grand am My wife was driving the


There is only one way the steam from the radiator could be coming in to the cab of the vehicle. That would be from the heater core, or the lines going to the heater core. If there is coolant/water leaking on that elbow on the firewall, it could either be that line that is leaking, or it could be leaking from the core and just dripping down to the elbow.

Sep 01, 2009 | 1996 Pontiac Grand Am

2 Answers

Coolent leak on fire wall in engine compartment on pasnger side


Hi , if you lift up your passenger side floor carpet and check underneath if there any coolant. If it`s dry you know the leak is in the engine bay ,if it`s wet could be either inside or outside of the firewall. In the engine bay check the hose clamps on both side of the hose if you can tight them or if one a those spring clamps try to reposition them. If you have hose clamp right at the firewall then you can easily change the hoses otherwise you have to access it from under or worst case behind the dash. Hope that helps.

May 29, 2009 | 1997 Pontiac Grand Am

1 Answer

Bad leak from little 2 inch L shaped hose next to lower firewall


its either the hose,or the heater core.
the core can crack where the pipes meet the core and
if you can smell antifreeze in the car and the windshield fogs,it is the core....the hose can also crack on the inside of the firewall and get misdiagnosed as a heater core.
big job,the dash has to come out

May 11, 2009 | 1996 Pontiac Grand Am

1 Answer

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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