99 sunfire heater core r and r

jaded13640

New member
Joined
Feb 11, 2014
Messages
13
Reaction score
0
Points
0
Hey folks, I have the unenviable task of changing a heater core on a 99 sunfire.

The manual says you have to pull the instrument pannel, steering wheel and airbags.

Someone was telling me he thought you could unbolt the dash and hold it up with a strap high enough to get the heater core out but I'm afraid he's confusing it with another vehicle. I havn't attempted it yet but it kind of looks like this doens't have the typical "removable" dash. You know, two bolts on each end and screws though the heater vents like most cars?

Anyone who's done it and can give me a few shortcuts, I'd be VERY grateful.

I have to do it tomorrow morning. I would have posted this earlier but I had to bowl and didn't have time before I washed up to leave.

Thanks in advance,

Wayne
 
Yea, I saw that too.

Have you ever done one?

Do you have to remove the steering wheel and air bag?

One pages said you had to pull the steering column!

Working in this business it's still amazing after 35 years the stuff engineers have done.

I was an engineer. I didn't design cars I designed stamping tools and gages and special mechaine tools. I went out of my way to make things so that they were serviceable. THIS...this is outragous. For a stupid 40 dollar heater core! It's not like an engine bearing where you expect to have to pull the motor and disassemble it and have machining done. It's freaking heater core! LOL

Anyway, if you've done one and tell me about the steering wheel and airbag I'd appreciate it. I'll be headed out there in an hour or so.
 
melsg5, have you ever done one?
______________________________
 
Yes, no luck there either.

I guess I have little choice but to just dive into it and take apart what needs to come apart. I'll leave the steering wheel on unless it has to come off I guess.

I've done hundreds of heater cores and they're rearely pleasent but usually you do them within a few hours. It would be nice to know what needs to come off and what does't. The manuals will tell you to take everything off whether it really needs to or not. Many things can often be set aside or held up or something.

That's what I was hoping to learn here.
 
I have never done a sunfire heater core. If you search the web it varies by indiividual whether they had to remove the wheel.
 
The opening that the steering column fits through, isn't big enought to slip over the wheel or the switch levers. You might be able to remove the switch lever and leave the dash cover in the car and wire it up but with one nut and a quck use of the puller I was able to get everything out of the way.

It turned out that the only reason you need to pull the dash pannel is because there are two screws at the very front of the heater core cover pannel that are inexecssable with the pannel on.

The manuals and online pages I've found aren't clear that the goal is to remove the bottom pannel on the heater/ac module. I started to take the top piece off because I could peek in there and see the heater core. But you can't get it out that way. You HAVE to get the bottom cover off and take it out that way. Unless you go ahead and remove the entire module but that's far more involved than what I did. The strength bars or whatever you want to call them than run under the dash panel migh need to be removed and whole crap load of wiring and linkages and vacuum hoses will need to be removed to go that route. And again, there's one screw on the back of the cover that is next to impossible to get out with the contour of the tunnel being the way it is. A deep socket's too deep and a shallow is too shallow and a swivel doesn't help. You could probably be more carefull in denting in the tunnel to avoid putting holes in it but good luck there. The steel is very thin and you have to bend it in a lot.

There's one screw on the back of the cover a couple inches in from the right that is is inexecessable no matter what you have for sockets or swivels. That's why some say to remove the ac lines and remove the entire module. This is just a clunker so I used a drift, hammer and air chisel to cave in an area of the tunnel that allowed me to get access to the screw. I have pictures I'll post. Be careful with that, the metel is already thin it'll rip in a heartbeat. I tore the hell out of it and will have to patch it now but it was still far easier than removing the entire module.


This is just one of those throw away cars that they figured the heater core would outlast the rest of the car. Now that I know the dash panel/cover doesn't need to come completely out of the car I migh just pull the switches off the steering column and bungie the panel up and out of the way and not remove the wheel. But at the time I didn't know and nobody seemed to have any short cuts.

This is a huge pain in the arse job that you do not want to do if you can avoid it. If you have one of these heaps of sheit and have no choice, it can be done and you have a big job ahead of you. But if you're thinking of buying one that has a heater core leak, unless they're paying you to take it...pass.

You gotta do all this...
P4160013.jpg

P4160011.jpg

P4160009.jpg

P4160010.jpg


and then do this
P4160012.jpg


All so you can get at this
P4160014.jpg


The entire back seat is full of parts but the picture must not of turned out.

Good luck,

Wayne
______________________________
 
Thanks for the detailed post and sorry for all the pain you are going through
 
The heater core's in, the cover's back on and the "dash cover" is going back on now. What a job!
 
Well, it's all back together...what a freaking job!

If I have have to do another on, God forbid, I'll know a couple of shortcuts.

Like for example, leave the screws that hold the black vent tubes that attach to the "dash cover" if that's what you call it. You have to unhook the smaller tubes that attach to them but that's one little time saver.
The manual isn't very clear on what the "heater core cover" actually is. It's the cover on the bottom. I assumed since the whole dash had to come out it must be the upper cover. After screwing around with it for about an hour I realized you can't get the heater core out that way anyway.

And of course now I know where the bolts are. Whereas before I had to find them as I went along. Again, the manual isn't very clear on where each and every bolt and screw is.

There's one screw on the very back right side of the heater core cover that's nearly impossible to get at. I had to hammer in the steel in order to gain access to the screw. WHAT A PAIN IN THE ARSE!!! When doing this, be very careful. The steel in these cars is already so thin it doesn't take much to rip right through, which I did. Thank God for duct tape! When reassembling, if you've put all the rest of the screws back in, skip that one screw. The cover isn't going to fall off or leak and it's not worth the pain and suffering to put it back in.

The dimmer wheel on the "dash cover"...the connector is really hard to get at from the back. You have to pull the cover way out and then reach in with a screw driver to get it from the back. BUT you can pop the switch out, pull the wire through and disconnect the plug before you pull the dash cover off. Not a huge time saver but when you have a massive pain in the ass job like this, every little trick counts.

Another little one that barely is worth a mention. I'm pretty sure, if I remember right, that the glove box door doesn't actually need to come off. You can get at all the necessary screws by just undoing the catch and allowing it to hang down. It's might be worth taking off given that it's only held on by four screws and it makes the dash cover that much lighter and a little easier to handle but again, not completely necessary to remove.

I sliced away some of the floor padding that is right around the back of the heater cover cover. I made one cut on each side and removed the piece that goes over the tunnel. Again, that one screw is pretty much impossible to get out unless you mash the steel in and completely impossible with the padding in the way. Just slice it, pull it out and duct tape it back in place before you put the carpet back down.

Reassembly probably would have been a little quicker had I taking pictures in stages as I disassembled it. Some of the screws are very simillar but are of different length. Some are phillips and some are hex and some are hex/torx. I found it didn't matter in the end because the shorter screws worked just fine where longer ones belonged and vice versa. But again, when a job is this big of a pain, it's nice to be able to pull up a pic and see exactly what screws went where. I'm sure I also used a few phillips screws where hex/torx head screws should have gone and vice versa. And again, in the end it didn't matter but it did cause a little bit of time loss in stopping to try to remember if a phillips when there or was it a hex...

I'm not 100% sure on the radio harness. I don't recall unplugging two connecters and the antenna. And I couldn't find a second wire/ plug to put back in so I can't say for sure if the radio is going to work when I get the motor and the battery back in it. Again, a snapshot would have helpped me there too.

Bottom line this is one of those jobs that you have to be patient. Which is really hard because the thought is always in the back of your mind, "this is bullshit! This shouldn't be this hard! Those fing engineers screwed me again! All this for a 25 dollar part?! You have to put that shit aside and know that it's a ridiculasly stupid situation and that's that. It is what it is and the job has to be done. Knowing how huge of a job is it going it might make it a little easier simply because you won't be surprised again and again like I was when yet another stupid part had to be removed that to me didn't seem necessary.

You have to go into it knowing it's not as easy as other heater core jobs. Some are more miserable than others. Some are unbelievably, ridiculasly, stupidly painful. The 99 Pontiac Sunfire is one of those deals.

I can't think of anything else off the top of my head to post that might be helpful but please feel free to ask me any questions you might have.

I can't seem to figure out how to get a notification when someone posts to this thread so I'll leave my email address if you need to contact me.

This was a nasty job and if I can help someone keep their hair from going gray/falling out/getting ripped out, then something good came out of this. I'm certainly not going to make any money on this one! LOL Some jobs are just like that unfortunately.

Cheers and have a good one,

Wayne
jaded13640@aol.com
 
Back
Top