help with 84 300ZX heater core

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Keith - 01 Mar 2005 14:14 GMT

Does anyone know if there is an easy way to replace the heater core in a
84 300zx with a/c. The nissan service manual is no help at all (the
section covering heating and a/c is almost exclusively a/c related) and
the chilton manual (yes I know how bad chilton manuals can be, but it is
actually more detailed then the nissan manual) says that I need to
disconnect the a/c hoses and take the whole assembly out to get to the
heater core. God I hope that the chilton manual is wrong!! Does anyone
have any insight on the matter (Steve?).

I also am not sure but it looks like there may be hoses inside the cabin
going from the firewall to the heater core. If so, how in the hell are
you supposed to get to them and what a stupid design? I hope I'm wrong
on the interior hoses.

Thanks in advance,
Keith

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Steve T - 02 Mar 2005 04:31 GMT

> Does anyone know if there is an easy way to replace the heater core in a
> 84 300zx with a/c.

It's a real mother of a job. The heater box is the first thing you install
when assembling the dash area. The whole dash etc has to come completely
out of the car etc etc.

> the chilton manual says that I need to
> disconnect the a/c hoses and take the whole assembly out to get to the
> heater core. God I hope that the chilton manual is wrong!!

It's not.

> I also am not sure but it looks like there may be hoses inside the cabin
> going from the firewall to the heater core. If so, how in the hell are
> you supposed to get to them and what a stupid design?

It lasted >20 years... The hoses still aren't the problem and replacing the
heater core on most cars is a =MAJOR= PITA.

> I hope I'm wrong
> on the interior hoses.

You aren't and you should order new hoses to replace them while you're doing
the heater core. I also wouldn't play around with aftermarket heater cores
as hard as this one is to replace but that's your call.

Sorry for the bad news. I've done them several times in the past and it's a
good 2 day job for a Pro. And I'd just as soon never have to do another!

Signature

Steve

http://www.atlantaracing.com

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Keith - 02 Mar 2005 14:53 GMT

> > Does anyone know if there is an easy way to replace the heater core in a
> > 84 300zx with a/c.
[quoted text clipped - 25 lines]
> Sorry for the bad news. I've done them several times in the past and it's a
> good 2 day job for a Pro. And I'd just as soon never have to do another!

Thanks Steve. I just wish that my information had been wrong :p

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