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Old 01-02-2021, 06:24 PM   #1
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Heater Core Inlet broken

Hi all, hope everyone had a good new year! This question might've been covered but not sure if anyone has a solution of some sort.
The inlet nipple on my heater core (the nipple with the blend door valve) busted a while back when reattaching the heater hose to it. It's not completely broken, as you'll see in the pic below. My only options are:
1. Buy a used heater core, and hope the plastic nipples don't shatter when installing.(new heater cores are long discontinued for the 91 240)
2. Find some kind of twist in nipple that won't destroy the remaining plastic nipple.
3. Just go without heat (but I'd rather not).

Buying a used heater core may be a good option, but I'm worried about the plastic breaking once I try to clamp a hose onto it.
Alternatively, is there some kind of "twist-in" aluminum nipple that can bite into plastic without leaking or destroying it?
Appreciate any help in advance!

Pics below show broken inlet nipple and length that broke off.


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Old 01-02-2021, 06:51 PM   #2
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Maybe try and remove the nipple, tap it aluminum core (or weld if you have access) some AN fitting or another form of fitting so you can thread a nipple or use NPT fittings.
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Old 01-02-2021, 08:15 PM   #3
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Quote:
Originally Posted by revenge240 View Post
(new heater cores are long discontinued for the 91 240)
RockAuto.com has them for $25.

Also the Nissan Stanza used the same core. You might be able to find some in a junk yard.
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Old 01-02-2021, 08:17 PM   #4
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Exactly, don't waste your time putting in a used one that's 30 years old. Just make sure that the gaskets for those plastic fittings are in right, and that the screws are tightened down. A lot of aftermarket coolers with fittings on them won't have them as tight as they should be, some even go so far as to include instructions reminding you to double check the tightness of the fittings (like a radiator that has an oil cooler built in, etc.)
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Last edited by burnsauto; 01-06-2021 at 07:36 AM..
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Old 01-02-2021, 08:34 PM   #5
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Thanks for the suggestions so far.
I actually did order a replacement heater core from Amazon, which looks like a good fit, however on the inlet side, there is a control valve that opens the core and blend door when you slide the controls to heat. The valve doesn?t appear to be transferable as it?s built into the nipple on the inlet side.
Can I just disregard this valve and not connect it to the new heater core?
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Old 01-03-2021, 03:59 PM   #6
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you will lose some functionality of it as it'll have coolant constantly flowing through it, so some temperature control will be lost in the process. Good news is you'll have a working defroster (not sure if it's even a thing to need one living in vegas..) but when it cools down at night you won't freeze.
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Old 01-05-2021, 12:50 AM   #7
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Thanks again for all the help, everyone!
Here are pics of my fix and the solution for any future reference:
First, a close up picture of the inlet side of the heater core. There is a valve there and you'll have hot coolant flowing through the heater core all the time, which will add some heat to your cabin when you don't necessarily want it. Thus, I was prompted to find a way to keep that inlet nipple, if I could.

Below, I used some painter's tape and oscillating tool to cut off the damaged part of the old nipple.

Lastly, cut off the end of the new nipple and spliced to the old inlet nipple using a 1/2" plastic barb fitting from Home Depot.

I added J.B. Weld around the splice to prevent any leaks from occurring. The nipple is now a bit longer than stock, but that's okay with me
I haven't hooked my heater core back up yet, but I got the dash put back together and will report back once I get it all hooked up to let everyone know if it worked or not. I'm pretty confident this will work though..
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Old 01-05-2021, 09:01 AM   #8
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There was a dude on facebook (I think) recently who was inquiring about making aluminum ones. I shouldve hit the save button.

Either way, good fix!
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Old 01-05-2021, 11:52 PM   #9
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Check these out... little pricey but i think the heater cores are all the same 4 screw pattern/size outlet flange, just different core sizes/outlet shape tubes.

https://boostdoc.com.au/collections/...r-core-outlets

Edit: tuzzio, was it the same guy that i bought the pcv/water bypass stuff from on the ka24 page? (Not nicetime racing) I mentioned it to him in DMs that making them in aluminum would be a good idea seeing he did a good job on the other parts.
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Old 01-06-2021, 02:13 AM   #10
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Shit I wish I would have seen those before I made my setup. Would have been way cleaner. Welp....if my dash has to come back out definitely going with those.
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Old 01-06-2021, 07:35 AM   #11
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Quote:
Originally Posted by Super_OK_S13 View Post
Check these out... little pricey but i think the heater cores are all the same 4 screw pattern/size outlet flange, just different core sizes/outlet shape tubes.

https://boostdoc.com.au/collections/...r-core-outlets

Edit: tuzzio, was it the same guy that i bought the pcv/water bypass stuff from on the ka24 page? (Not nicetime racing) I mentioned it to him in DMs that making them in aluminum would be a good idea seeing he did a good job on the other parts.
Good God!

$25 Heater Core - Check
$225 A/N Fittings - Check

Lets Get to work.
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Old 01-06-2021, 09:11 AM   #12
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Quote:
Originally Posted by Super_OK_S13 View Post

https://boostdoc.com.au/collections/...r-core-outlets

Edit: tuzzio, was it the same guy that i bought the pcv/water bypass stuff from on the ka24 page?
Honestly, I cant remember. I spend too much time online. I should research this later.

Quote:
Originally Posted by burnsauto View Post
Good God!
$25 Heater Core - Check
$225 A/N Fittings - Check
Even with the exchange rate, they're about $175 (and shipping To / From AUS is EXPENSIVE)

I have a friend who could likely accomplish this. It has been discussed and he thought there would be little to no money in it. Sheesh.
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Old 01-06-2021, 09:15 AM   #13
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$175 is not bad for something machined specifically. It could be less if more made/desired.

The machine does most the work but machining items takes time. Anyways OP, how’s your fix? working?
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Old 01-06-2021, 11:09 AM   #14
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175 bucks seems steep, especially thinking that the only benefit would be switching to an A/N fitting, which unless your going real racecar, the benefits are negligible. If it also solved the issues that aftermarket fittings present (no control valve), I could maybe understand the appeal for a part like that at such a cost. Lipstick on a pig is the common M/O for the S Chassis...but I guess to each his own.
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Old 01-06-2021, 02:44 PM   #15
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some race cars need heat
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Old 01-06-2021, 02:50 PM   #16
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Quote:
Originally Posted by burnsauto View Post
Lipstick on a pig is the common M/O for the S Chassis...but I guess to each his own.
Maybe your way of building, not here though. Quality comes at a cost, the over engineering is a matter of perspective. If you?re doing things half ass or worried somethings too nice for the 240 cause if it?s age or general perception you should move on from the chassis. This is getting far off topic, in only interested in the OP and if his fix.

Primary concern, the JB weld and coolant. Would attached the with a hose and clamps have been better? I just know coolant is a slippery devil.
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Old 01-06-2021, 11:47 PM   #17
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Update: Fix is working good so far! Drove around for about 20 minutes and it was definitely nice to feel heat in the 240 for the first time in 9 years.. The JB Weld combined with the inner plastic barb connector is very strong. As a note: the JB Weld was more to create a seal around the splice, not to hold the pieces together. The plastic barb is holding the 2 pieces together very well. I did have to drill out the inside diameter of the new nipple just a bit as it was a little too narrow, but the barb fit perfect into the original nipple.
Those aluminum heater core nipples look great, but not so sure it's worth that much when you can buy an entire heater core with new nipples for $30, but to each their own..
I'll update again if there are any issues, but I think this will hold up for a long time.
Below are some pics of how it looks now. I'll also include a photo of the plastic barb I got to splice the new and old nipples together(only came in a 5 pack at my closest Home Depot):


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Old 01-12-2021, 04:18 PM   #18
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Old 01-12-2021, 05:02 PM   #19
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I just ordered the OSC 98819 heater core from Amazon, and it comes with the plastic fittings (unlike many others), $25 with free shipping.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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