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 Post subject: Heater core replacement?
PostPosted: Wed Apr 04, 2012 8:16 pm 
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I read up on it and it doesn't look to be too difficult. Anyone done this or have taken it to shop to be done? How long did it take ya or how much did ya pay to have it done?

An old high school teacher likes calling me for odd jobs on his cars and I guess he got an 06 Grand Prix that he says needs a heater core. I would do it but I want to make sure that I am not going to do a huge job for what I am guessing isn't gone to be that much money.

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PostPosted: Thu Apr 05, 2012 12:27 am 
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Its rated at 2.7 hours for replacement (add .8 with center console) according to alldata.

GM P/N: 89018289
MSRP: $203.40

Removal Procedure:
1.Drain the coolant. Refer to Draining and Filling Cooling System in Cooling System.
2.Use J 38185 in order to position aside the heater hose inlet and outlet clamps at the heater core.
3.Disconnect the inlet and outlet heater hose from the heater core.
4.Remove the RH Instrument Panel Closeout/Insulator panel.
5.Remove the LH Instrument Panel Closeout/insulator panel.
6.Remove the floor carpet.
7.Remove the rear floor air outlet duct from the holes in the floor reinforcement.
8.Disconnect the rear floor air outlet duct from the heater core outlet cover.
9.Remove the rear floor air outlet duct.
10.Remove the heater core outlet cover screws (2).
11.Remove the heater core outlet cover heat stakes (1) with a small chisel.
12.Remove the heater core outlet cover from the HVAC module assembly.
13.Remove the heater core cover screws (2).
14.Remove the heater core cover heat stakes (1) with a small chisel.
15.Remove the heater core cover from the HVAC module assembly
16.Remove the heater core from the HVAC module assembly.
17.Remove the heater core foam seal (1) from the HVAC module assembly.

Installation Procdure:
1.Install a new heater core foam seal (1) to the HVAC module assembly.
2.Install the heater core to the HVAC module assembly.
3.From the inside of the heater core cover, drill the dimples adjacent to the heat stakes using a 5.5 mm (7/32 in) drill bit.
4.Install the heater core cover. NOTE: Refer to Fastener Notice in Service Precautions.
5.Install the heater core cover screws to the heater core cover. Tighten Tighten all the screws to 1.5 N.m (13 lb in) .
6.From the inside of the heater core outlet cover, drill the dimples adjacent to the heat stakes using a 5.5 mm (7/32 in) drill bit.
7.Install the heater core outlet cover.
8.Install the heater core outlet cover screws (2). Tighten Tighten the screws to 1.5 N.m (13 lb in) .
9.Connect the rear floor air outlet duct to the heater core outlet cover.
10.Install the rear floor air outlet duct to the holes in the floor reinforcement.
11.Install the floor carpet.
12.Install the RH Instrument Panel Closeout/Insulator panel.
13.Install the RH Instrument Panel Closeout/Insulator panel.
14.Connect the inlet and outlet heater hose to the heater core.
15.Use J38185 in order to reposition the heater hose inlet and outlet clamps to the heater core.
16.Refill the coolant. Refer to Draining and Filling Cooling System in Cooling System.

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PostPosted: Thu Apr 05, 2012 10:24 am 
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It took me about 8 hours becaue it is a major PIA to get to the all of the screws and chip the plastic rivets out. You basically have to take out all of the interior just so that you can lay down in there and get into some pretty interesting positions to get to the screws.

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PostPosted: Thu Apr 05, 2012 2:04 pm 
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It was a big enough PITA to replace the blower motor and control module when it went out in my 04... Seriously hoping I never have to do that again... Can't imagine how bad a heater core would be.

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PostPosted: Thu Apr 05, 2012 11:35 pm 
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Ya well i told him id do it. Hopefully he makes it right with me. Michell on demand said its 3.8 hours labor. Ill let ya all know how it goes.

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PostPosted: Sat Apr 07, 2012 4:42 pm 
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Ya I'm half way in. I took everything I could out of the inside of the car. Those plastic rivets are a PIA! There's no room to work down there. O well I guess I'll keep on going.

Thanks Brain for the instructions.

I was going to print it off at school but or printer was out of ink. I was using Autozone's repair gauge put it don't give any details about the plastic rivets or anything.

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PostPosted: Mon Apr 09, 2012 11:47 pm 
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Well all done with it. I can say I truly don't want to do this again any time soon. The guy gave me the new heater core he bought but it was very cheap. The collar on it would not fit through the fire wall. So we tried modifying the pipe and it broke. So I got the old heater core unclogged and put it back in. Works good now but Kind of pissed on how he bought such cheap crap for such a big job.

Here's a pic of the interior during the install.lol
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And a comparison of my mom's car on lowering springs and his on stock
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PostPosted: Wed Feb 27, 2013 10:10 pm 
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Quick question im doing the same thing and ot to the part shown in picture. im having some trouble removing the heater cores outter black case thing under the center console.. could you shed any light on taking out the black things i already removed the silver bolts. i assume the black things are the heat stakes


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PostPosted: Wed Feb 27, 2013 10:20 pm 
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I used a sharp 1/4" inch chisel, You can work it under the stake and just tap it with your free hand. For the ones further in I used the chisel and tapped it with a pliers, they pop right out. dont be concerned how much plastic might come out with the stake, once you drill out the holes next to the stakes and get some 6 or 8 size 3/4" sheet metal screws it will be solid.

I remember this post from before I did mine....Holy crap that was some wasted disassembly. All I took off was the kick plates, front radio cowl,passenger side panel, then took out glove box for more room.


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PostPosted: Thu Feb 28, 2013 8:14 pm 
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sunday im finishing up ill post some pictures of whats done so far so i can get a little more direction and make sure im doing everything correctly


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