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MC209
09-03-2012, 12:06 PM
My heater does not kick out warm air in my boat. I got a buddy with a x-25 and he said his only kicks out warm air when he is moving along and not toodling around. So last night I went around our local lake a couple times at 35 with the heater on, and still no heat. any ideas?

jgraham37128
09-03-2012, 12:34 PM
My heater does not kick out warm air in my boat. I got a buddy with a x-25 and he said his only kicks out warm air when he is moving along and not toodling around. So last night I went around our local lake a couple times at 35 with the heater on, and still no heat. any ideas?

Is it blowing cold air? I can only assume you do have the fan switch on to make it blow warm air?

MC209
09-03-2012, 12:36 PM
the air is just barley warm. not cold but should be way more warm.
Is it blowing cold air? I can only assume you do have the fan switch on to make it blow warm air?

MC209
09-03-2012, 12:37 PM
I can only assume you do have the fan switch on to make it blow warm air
I just have a switch to have heat on low or high

jgraham37128
09-03-2012, 12:39 PM
the air is just barley warm. not cold but should be way more warm.


Not sure then. I was thinking, maybe you wasn't aware of the switch to turn it on?

I have a 2010 X2 and it blows very warm air when on.

jgraham37128
09-03-2012, 12:40 PM
I can only assume you do have the fan switch on to make it blow warm air
I just have a switch to have heat on low or high



Yes, that's the one I'm referring to that kicks the fan on.

MC209
09-03-2012, 12:41 PM
Not sure then. I was thinking, maybe you wasn't aware of the switch to turn it on?

I have a 2010 X2 and it blows very warm air when on.

is your air "more" warm when going faster?

jakethebt
09-03-2012, 12:41 PM
I assume that you have the hot water tap open or you dont have one otherwise you would never get hot water to the heater core. Do a search on here for this one. It all has to do with where on your engine are you getting the water from. Some on here have moved the factory location for better hot water at idle. I think most of the discussion was around the LT1, but ICBW.

MC209
09-03-2012, 12:50 PM
would their just be a switch in the line before the heater core?

I assume that you have the hot water tap open or you dont have one otherwise you would never get hot water to the heater core. Do a search on here for this one. It all has to do with where on your engine are you getting the water from. Some on here have moved the factory location for better hot water at idle. I think most of the discussion was around the LT1, but ICBW.

501s
09-03-2012, 01:27 PM
I have a 2012 X-30 with the MV8 and my friend has a 2012 Moomba and the heater is much warmer on his boat then mine. He also has 2 pull out hoses while I only have 1.

If anyone has tips for improving the heat i'd also like to hear them.

MC209
09-03-2012, 01:34 PM
I also ski behind a buddies 05 malibu, his heat is way way hot. He has a couple put out hoses also. none of mine pull out. can you swap them out with new so they do?
I have a 2012 X-30 with the MV8 and my friend has a 2012 Moomba and the heater is much warmer on his boat then mine. He also has 2 pull out hoses while I only have 1.

If anyone has tips for improving the heat i'd also like to hear them.

MC209
09-03-2012, 01:36 PM
and 501, in the straightest way possible, I am insanely jealous of your x-30!!
I also ski behind a buddies 05 malibu, his heat is way way hot. He has a couple put out hoses also. none of mine pull out. can you swap them out with new so they do?

jafo9
09-03-2012, 05:28 PM
i don't know the specifics of your boat but it should be the same basic design on most boats. you will have an intake hose and a return hose to your core which is basically a radiator like in old houses. hot water comes from the cooling system of the motor and goes through the core and air is blown across it and then through your vents. yes, you can swap out the fixed vents for pull out vents. i think skidim has all the parts. you may not be getting any water to the core. the PO on my boat had just connected the 2 lines at the core when the core started to leak. the fan would still blow air across the core, but it wasn't warm as it wasn't getting water. someone may have put a valve in the hose from the motor to the core. this would be beneficial if the system developed a leak under way and you needed a quick way to shut it off. or it may have been winterized and never reconnected and the hoses are capped at the block.

another possibility is maybe your motor isn't hot. i know this sounds silly, but when my thermostat had a piece of the impeller in it, it was stuck way open and the motor wouldn't get above 120 degrees. this yielded only lukewarm air at best out of the heater. once i fixed the t-stat and got up to 160 degrees it was nice and warm again. i do notice that my heat is a little better when i'm underway. this makes sense since the motor is putting off more energy as heat and the water pump is pumping faster. btw this is on an 02 X30 with 2 vents and 1 fan speed.

501s
09-04-2012, 03:13 AM
Thanks a lot MC209. It is really a great boat, we love it. It does everything well, handles well and has tons of storage.

One more pic.

jgraham37128
09-04-2012, 09:08 AM
is your air "more" warm when going faster?

I'm not sure, I haven't really noticed it but we just bought the boat in May so wer really have limited use with the heater but we have used it a night or two going back to the dock and it worked fine. I'll check this weekend.

LiteItUp
09-04-2012, 03:06 PM
I have a X2 2010. The heater is electric and not like a car withcoil and core. I would assume you have a electic issue at heater or heating coils are having issues.

Good Luck.

Thrall
09-04-2012, 06:31 PM
I have a X2 2010. The heater is electric and not like a car withcoil and core. I would assume you have a electic issue at heater or heating coils are having issues.

Good Luck.

Do you have a picture of it?
Every ski boat heater I've seen is a heater core with a fan, using hot engine water.
If it's not blowing hot air, either there's a valve on the hot side line coming off the intake that is closed not letting hot water to the heatercore, or the outlet hose is routed in a way that it's not allowing good flow thru the heatercore. Skidim sells a "Y" fitting that plumbs into the raw water itnake line that increases the flow thru the heater. It's not too expensive, maybe try that.

bcd
09-04-2012, 06:32 PM
I have a 2012 X-30 with the MV8 and my friend has a 2012 Moomba and the heater is much warmer on his boat then mine. He also has 2 pull out hoses while I only have 1.

If anyone has tips for improving the heat i'd also like to hear them.

The 2012 heaters were bad from the factory. There is a kit developed that moves your hot water supply port to a hotter portion of the engine, puts in a higher cracking thermostat, and moves your return port to spot to get more flow through the core. A couple of lessons that I've learned the hard way. Make sure when they cap your old supply port, they use a metal cap or plug, not rubber. It will split and cause you a world of problems. Also, make sure they update your software to increase the overheat alarm point. They supposedly have changed production to the higher Tstat, so all you need is the latest software revision. Mine now blows warmer air. It isn't as hot as what my car spits out, but it's a ton better than what it used to be.

As far as the OP, it looks like you've got an older boat, so this won't apply to you. Try to find your heater lines coming off the engine. When the engine's warmed up, feel the lines to see if one of them is warm/hot. If not, you're not getting flow to the core.

You can also look into getting a Y pipe to plumb your return line into your water pump inlet. This helps increase the flow through the core.

wheelerd
09-04-2012, 06:56 PM
A couple of things . . .
- Pull the heater supply and return hoses off the engine and see if you can blow through them, just to make sure there isn't something blocking them and/or the core.
- Try the reverse and blow INTO the engine outlet port; maybe a piece of rust or other deposit in the water jacket shifted and is partially blocking the outlet.
- Check your tranny cooler on the raw water intake side to make sure there is no gunk like weeds partially blocking it. My heater was noticeably cooler last week and I discovered lots of weeds in there. Strangely, the engine temp still read normal.

I did the heater install myself last year and it works fine. I used the Y-adapter from SkiDim that was mentioned above and I get good heat at idle and great heat when under way.

MC209
09-04-2012, 07:37 PM
Thanks for all the imput gents. I will be checking so see if the intake to the core is on or off. I didnt realize their is a shut off and that this couldve been the problem. I will check it out and let you all know. If I still cant get it figured out I will take some pics and post them up!

cmike
09-06-2012, 11:51 AM
I have a 2012 X-30 with the MV8 and my friend has a 2012 Moomba and the heater is much warmer on his boat then mine. He also has 2 pull out hoses while I only have 1.

If anyone has tips for improving the heat i'd also like to hear them.
Completely agree... the heater on my X2 (which I love) completely sucks compared to my old boat... any suggestions on how to turbo charge the thing would be appreciated

ttu
09-06-2012, 11:58 AM
here is a older thread of mine and the recommended "y" hose helped a ton!

http://www.mastercraft.com/teamtalk/showthread.php?t=19939

501s
09-06-2012, 12:42 PM
I'm glad to see it wasn't just me or my imagination about the heater not being very warm. We have on one of those blankets that you can plug the pull out hose into and it barely even gets warm, while on my friends Moomba it was so nice and toasty. I guess this will be addressed during our end of year service, too bad it won't be very warm for the fall when it's needed most.