2016 Craz 400 Coolant consumption

In 2017, my second summer with the boat, I got an overheat warning on my boat. I shut her down and took her to the dealer. Solution was it was low on coolant. Dealer added a gallon or so! and told me he let it run for an hour and never saw a leak. So the past 2 summers I keep a close eye on the coolant level. It “consumes” about 1 cup every 2 weeks or so. Is this normal? If it’s anything like my automobiles I never need to add coolant. What are others experiencing?

Quick addition to my thread. Owners manual says “ Check engine coolant “DAILY”! Failure to maintain the coolant at proper level can cause engine damage..... Does this imply Inmar knows these engines consume coolant??

You shouldn't be losing that much coolant, there has to be a leak somewhere. Do you have a heater? I think that's a common place to have a leak, and it would leak there even if you're not running the heater, the coolant is always circulating through it, at least that's my understanding.

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Originally Posted by schwan

You shouldn't be losing that much coolant, there has to be a leak somewhere. Do you have a heater? I think that's a common place to have a leak, and it would leak there even if you're not running the heater, the coolant is always circulating through it, at least that's my understanding.

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Thanks for the suggestion! Looked at my heater box under seat on port side. 2 heater hoses enter the box and there was a puddle underneath. I’m going to tighten the clamps and see if that’s it. Unfortunately I already have the boat winterized so I can’t test it. Thanks again for the great idea!

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Originally Posted by DRHRSH

Thanks for the suggestion! Looked at my heater box under seat on port side. 2 heater hoses enter the box and there was a puddle underneath. I’m going to tighten the clamps and see if that’s it. Unfortunately I already have the boat winterized so I can’t test it. Thanks again for the great idea!

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I had a small leak on the heater pump housing, really hard to spot until it got really big, check the hoses and the bottom on the pump too.

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Originally Posted by parrothd

I had a small leak on the heater pump housing, really hard to spot until it got really big, check the hoses and the bottom on the pump too.

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I will! What do you mean by “ the bottom on the pump”?

Thanks

I had the same problem. Leak at the heater. Tightened the hose camp and it has been good all year.


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Originally Posted by DRHRSH

I will! What do you mean by “ the bottom on the pump”?

Thanks

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There's a small circulation pump, port side engine compartment near the back. Has 2 hoses on it to/from the heater.

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Originally Posted by parrothd

There's a small circulation pump, port side engine compartment near the back. Has 2 hoses on it to/from the heater.

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Got it! So I would think that pump only runs when the heater switch is on, circulating coolant to the heater box. Makes sense since I had a lot of heater users last weekend, which explains the coolant drop. Thanks for the help

Update on the coolant loss! I saw a puddle under the circulation pump for the heater, thanks to parrotthd for the tip. It’s mounted on the port side rear of the engine compartment. At first I thought it was the fittings and hose clamps which seemed loose. But after tightening and running the engine I saw a slow drip UNDER the pump. That’s where the impeller housing is so it looks like a pump failure. Dealer will warranty, BUT since it’s past 3 yrs. “parts only, no labor”. Well it’s a 15 minute job to replace so no big deal. As mentioned by Schwab the pump runs ALL the time, not just when the heater switch is turned on. I guess this is so you get instant heat. So this baby has been running for over 300 hrs. Just a caution to others to keep an eye on your coolant and if you are adding frequently....look here!