Replacing ST185 heater core - Anybody done this ?

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Postby BoostedBlueToyotas » Sun Apr 30, 2006 11:37 am

Again PM me with your email and I can send pics

Some bad news from this, the brass tubes going thru the firewall (and
which are clamped to the heater core tube with O-rings) are NOT available
from Toyota (they are not even in the EPC). If you are leaking from here
you have to buy the entire box at the highest part price I have ever seen
from Toyota (minus the engine shortblock) at 1100+ discount.
Members don't see the above ad. Register now - it's free!
Tim Plessing
Columbia, MD

1990 ST185 - blue/blue cloth 152K-SOLD
1993 MR2 turbo - blue/black leather 59K TOTALLED/PARTING OUT
2006 Acura TSX - black/black 6 spd
2006 Mini Cooper S JCW Space blue/Silver roof 39k
2006 Mini Cooper JCW Silver/black roof 34k
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Re: Replacing ST185 heater core - Anybody done this ?

Postby Empiremen » Wed Sep 06, 2017 11:50 pm

This is a long shot but I'm gonna try... Does anybody have pictures or diagram for the bolt of the heater core? The heater box don't move that much and I have a feeling that I'm missing a bolt or two. Thanks
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Re: Replacing ST185 heater core - Anybody done this ?

Postby lalojamesliz1 » Thu Sep 07, 2017 5:23 am

Holly thread revival Batman! 11 yrs! Lol
I'd love some pictures as well. I get paranoid about having critical components like this that are 26 yrs old and counting....
91 Celica all-trac gen3 swap
87 toy 5speed long bed
69 mustang
08 sequoia
14 avalon
and a 2 car garage :shoots:
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Re: Replacing ST185 heater core - Anybody done this ?

Postby Empiremen » Thu Sep 07, 2017 9:54 pm

Yeah lol, I saw the date and laugh but I'm too desperate. STILL BoostedBlueToyotas is still an active member so maybe, just maybe he still have some pictures.
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Re: Replacing ST185 heater core - Anybody done this ?

Postby lalojamesliz1 » Fri Sep 08, 2017 12:28 am

Hey, at least your searching instead of just starting a new thread.
I can't imagine how many really good informative threads exist and are just buried behind threads that just were started because someone didn't search.
The only thing I hate about old threads is the pictures are usually gone
91 Celica all-trac gen3 swap
87 toy 5speed long bed
69 mustang
08 sequoia
14 avalon
and a 2 car garage :shoots:
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Re: Replacing ST185 heater core - Anybody done this ?

Postby BoostedBlueToyotas » Fri Sep 08, 2017 12:48 am

I still get email notifications so I know I got a PM. Car is long gone, here is what I remember of the assembly. I took it apart with dashpad in car. This involved wiggling the heater core box out which was no biggie on removal but didnt work well when installing. Basically each brass tube going thru the firewall is composed of two pieces clamped together. When I put this back together these connections came loose and leaked. So I had to pull the dashpad to be able to put the heater core box in straight so I didnt knock the brass pipes loose :(. I will look for the pics.
Tim Plessing
Columbia, MD

1990 ST185 - blue/blue cloth 152K-SOLD
1993 MR2 turbo - blue/black leather 59K TOTALLED/PARTING OUT
2006 Acura TSX - black/black 6 spd
2006 Mini Cooper S JCW Space blue/Silver roof 39k
2006 Mini Cooper JCW Silver/black roof 34k
BoostedBlueToyotas
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Joined: Mon Aug 09, 2004 11:33 pm
Location: Columbia, MD

Re: Replacing ST185 heater core - Anybody done this ?

Postby FC Zach » Fri Sep 08, 2017 3:05 am

If your pipes are like mine were and beyond repair. . At first you can try repairing the damaged areas like I did but if too far out you may have to get creative with copper pipe and solder. You will have to reuse the ends of these pipes where they connect to the HC. I also replaced the o-rings at these ends.

Image

I recommend pressure testing the assembly too, will save you a lot of headache especially if you still have pin-holes.

Image
1992 Toyota Celica AllTrac
1987 Mazda RX7 Sport
1979 Yamaha G1A, rotary powered with Sachs KM24
1976 Hercules W2000, oil injected
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Re: Replacing ST185 heater core - Anybody done this ?

Postby FC Zach » Fri Sep 08, 2017 3:11 am

The hose ends above are actually a part of a garden hose end repair kit that I used just for the barb fitting. I also recommend a non-hardening o-ring sealant at the pipe connections for the o-rings, I used Hylomar blue. .
1992 Toyota Celica AllTrac
1987 Mazda RX7 Sport
1979 Yamaha G1A, rotary powered with Sachs KM24
1976 Hercules W2000, oil injected
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Re: Replacing ST185 heater core - Anybody done this ?

Postby lalojamesliz1 » Fri Sep 08, 2017 12:39 pm

FC Zach wrote:The hose ends above are actually a part of a garden hose end repair kit that I used just for the barb fitting. I also recommend a non-hardening o-ring sealant at the pipe connections for the o-rings, I used Hylomar blue. .


Thank you :D
Was it you that I saw you had your heater core rebuilt?
I think that's the only way to do it correctly besides a new oem unit
91 Celica all-trac gen3 swap
87 toy 5speed long bed
69 mustang
08 sequoia
14 avalon
and a 2 car garage :shoots:
lalojamesliz1
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Posts: 156
Joined: Sun Jul 23, 2017 3:03 pm
Location: Bakersfield, CA

Re: Replacing ST185 heater core - Anybody done this ?

Postby FC Zach » Fri Sep 08, 2017 12:55 pm

lalojamesliz1 wrote:Thank you :D
Was it you that I saw you had your heater core rebuilt?


Nope, just the inlet/outlet.
1992 Toyota Celica AllTrac
1987 Mazda RX7 Sport
1979 Yamaha G1A, rotary powered with Sachs KM24
1976 Hercules W2000, oil injected
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FC Zach
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Posts: 818
Images: 9
Joined: Mon May 20, 2013 7:43 am
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