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Old 12-15-2014, 03:15 PM   #1
Koston740
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Default Heater core replacement "hack"

I know there is a easier way to do heater cores on 240s by cutting a hole in the heater core box and sliding the new core in. Has anyone attempted this method on a 7/9 series. Its a 1991 740 if that makes a difference.

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Old 12-15-2014, 03:17 PM   #2
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There is no shortcut on a 7/900 heater core. It only takes about 4 hours if you've done it before and remember where all the screws are.
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Old 12-15-2014, 03:19 PM   #3
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never done it before, have read the write ups on it and eveyone concludes it takes about 8 hours for most people.
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Old 12-15-2014, 03:20 PM   #4
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at this point I will wait until spring time to do this. Much too cold right now to be fussing around under the dash all day.
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Old 12-15-2014, 03:49 PM   #5
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About 5-6 hours for me, after the first few. No hack either.
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Old 12-15-2014, 04:56 PM   #6
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If I have my buddy help will that speed up the process? or is it quicker solo?
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Old 12-15-2014, 05:18 PM   #7
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If you have two people that have tackled this job before, then yes, it would help. Two people that are both trying to figure it out at the same time are probably not going to get it done any faster. If you have your buddy mainly as a gofer it might help... unless he's just going fer beer. In which case you'll probably move slower.
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Old 12-15-2014, 07:04 PM   #8
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Won't help much, as most of the access is driver side footwell. 1/4 drive sockets, torx, and contortion-ism will be your friends.
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Old 12-16-2014, 01:46 AM   #9
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I took a few weeks to do mine. Of course, that's because it was summer, I'm lazy, and I didn't mind driving around with the glovebox, ductwork, and console in the trunk, the fuse box laying on a towel on top of the tunnel, and the radio dangling by its wires against the passenger side of the tunnel. Basically, you don't have to rip the whole thing apart all at once, with frozen fingers and icicles hanging from your nose. A few parts today, a few parts tomorrow, a few more the day after, and suddenly....... you're done.
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Old 12-16-2014, 04:14 AM   #10
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Actually, there is a hack- It's just stupid.



This is how the Fridge came to me- with the AC Evaporator being used as a heater core. It lasted four years of daily driving like this. It was miserable in the summer, because the heat never really shut off.

This is the worst sort of hack job. It likely took almost as long to do this as it would have to do the job right and the only way to properly correct it meant swapping the whole heater box. Lemme tell ya... that sucked a thousand sucky sucks.

My suggestion- Make a weekend of it. You basically need to take the whole center console out anyway- take the seats out at the same time and clean everything. There'll be more room to work, too. Oh, and buy the all metal heater core if you actually want heat.

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Old 12-16-2014, 11:20 AM   #11
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Yes indeed, all metal is the only core to buy. I'm not looking forward to the job of replacing my core again so I can get some heat back. Lost a good 20-30* when I installed the plastic/alum. but that was literally the only thing on the market at the time.
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Old 12-16-2014, 01:38 PM   #12
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I've done 2 of them, both turbo cars. For some reason, I think they tend to destroy the heater cores faster/more often than the N/A cars. On the 2nd one I did, I installed an all metal one out of a 94 940 N/A car. I had it pressure checked at a rad shop before I started. No problems since then.
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Old 12-16-2014, 01:47 PM   #13
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thanks for the input everyone, I will go with an all metal core. Any recomondations for brand?
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Old 12-16-2014, 02:08 PM   #14
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thanks for the input everyone, I will go with an all metal core. Any recomondations for brand?
Yes. Ready Aire cores are sold under several different brand names. They are excellent quality as far as the 7-8 that I have bought and installed. I have one out in my shop. I'll check and see what brand name is actually on the box. Do not even think of installing a Nissens or other aluminum/plastic tank core. So far, everyone that I've talked to that used one of those lost significant heat capacity. The also have a habit of failing in 2-3 years.
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Old 12-16-2014, 07:01 PM   #15
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Think I'm around year 4 on mine, good to know it's due. Still have the last one that was a ready-aire recent replacement but the pipe came loose due to op error by a friend. Plan to get that repaired and ready for install.
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Old 12-16-2014, 11:11 PM   #16
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The heater core/blower motor is a rite of passage for the '80s RWD Volvo owner.

Mark, the heater hack in the fridge is legendary. It truly is best car.
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Old 12-16-2014, 11:39 PM   #17
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Quote:
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The heater core/blower motor is a rite of passage for the '80s RWD Volvo owner.

Mark, the heater hack in the fridge is legendary. It truly is best car.
Ding!

And

Ding!

Those who drive 240's are not really 'Owners' until having got to do this job.
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Old 12-17-2014, 01:20 AM   #18
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I'd rather just install non corroded used ones out of na cars than buy new aftermarket. Zip gun, tin snips and claw hammer makes removal from the donor car about 10 minutes.

Cut whole cabin harness, cut all dash tie straps, zip all nuts and bolts off. Now with the makita zip gun and angle impact battery gun I can have it all out real quick.

I think the higher pressure radiator cap and small water pump pulley (turbo 7/9 b230ft cars) as well as acidic coolant are what kills them. They seem to last indefinitely otherwise.
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