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2015 23 lsv heater reconnect


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We just got back into boating after taking many years off and recently purchased a new to me 2015 23 LSV with the LS3 engine.  I guess this is my first post so please go easy on me. 
Previous owner said it didn’t have a heater but upon further inspection it looks like it has one but never hooked up or possibly disconnected. In settings heater was turned off.  I turned it on and it blows air out the vents but no hot air.  It appears both hot water in and out lines are not hooked up, and just sitting in the transom.  Trying to figure out if it was #1 never hooked up when first purchased from the factory by the original owner (I am the 3rd owner) #2 it was winterized this way or #3 disconnected on purpose because of overheating issues with the ls3 motor.

should I just leave it disconnected or try and reconnect?  Is it as easy as finding couplings and additional hose?


Engine type
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heater in and out installed with loop

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cut heater hoses sitting near the rudder

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heater core behind the sub

iWxlhDCl.jpg

 

 

 

 

 

 

 

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You will also need an electric circulation pump to make the heater work correctly with the LS3.  Connecting the heater lines without a heater circulation pump will likely cause the engine to overheat.

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Also, I would presume that it was disconnected/deactivated for a reason.  As @csleaver says above, it will need a circ pump.  Perhaps that failed and it was removed; if so there should be some associated DC power nearby.  Also, consider that the heater core could have failed and has a hole in it.  I would pressure test the system with the 2 cut hoses and see if the core is still functional and leak-proof before hooking the lines back up and causing further unintended "fun."

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I'd bet that the heater was not blown out when the boat was winterized at some point and the heater core froze and split.  You could pressure test it easily by plugging one of the heater hoses and putting some air (10-15 lbs pressure) in the other end.  If you have a helper they will hear the air escaping in the heater box if it has a hole in it.

 

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Great my heater core is still intact :)

Would someone be so kind to post a pic of where the circulation pump should be mounted and how it is wired/what it is wired to?  Is it at the helm or in the transom or does it matter?  It installed on the “out” side of the engine loop correct as opposed to the return/in side? TIA
 

Eyeing this “heater pump” wire but appears to be hot as soon as I power up everything…strange 

0mIrNCdl.jpg
 

Edited by anutami
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The heater circ pump is usually mounted on the port side of the engine near the heater hoses inline on the heater out hose.  The heater out engine port is connected to the pump inlet, the hose going to the heater core is connected to the pump outlet, and the other hose from the heater core is connected to the heater in port on the engine.

There should be a wiring harness with a relay that connects to the heater pump wiring, the heater wire in your photo, a ground wire, and the fuel pump harness.  If the relay harness is missing, you will need to get one, or make one.

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1 hour ago, csleaver said:

The heater circ pump is usually mounted on the port side of the engine near the heater hoses inline on the heater out hose.  The heater out engine port is connected to the pump inlet, the hose going to the heater core is connected to the pump outlet, and the other hose from the heater core is connected to the heater in port on the engine.

There should be a wiring harness with a relay that connects to the heater pump wiring, the heater wire in your photo, a ground wire, and the fuel pump harness.  If the relay harness is missing, you will need to get one, or make one.

I owe you a beer, thanks so much!  I ordered the relay from active wake.  Will post pics once I get it installed 

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