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M380 (Unique Issues) If you have a unique issue with your M380 model coach and it can't be answered in one of the other forums here, then this is where you can list it.....list your M380 Parts here too.

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  #1  
Old 05-30-2019
AEmedic AEmedic is offline
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Default Hurricane Question?

It appears that I am missing the engine preheat pump switch... If it was there, where on the dash would it be? I have noticed that there is a pump running all the time and I don't know how to turn it off. With the switch missing, I assume that it is just wired to run constantly. I am going to tear the dash apart this weekend and I am going to try to find a switch to replace the one that is missing.
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2004 M380 DS
Jeep TJ Toad - LS 5.3 swap in process
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Old 05-31-2019
marvjeanm380 marvjeanm380 is offline
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It has been several years but I don't remember an engine preheat switch on the dash. To enable the engine preheat I had to turn on a breaker in the bedroom breaker panel.
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2004 M380 - SOLD
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Old 05-31-2019
Born_To_Run Born_To_Run is offline
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Default Engine preheat

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Originally Posted by marvjeanm380 View Post
It has been several years but I don't remember an engine preheat switch on the dash. To enable the engine preheat I had to turn on a breaker in the bedroom breaker panel.
I also have a breaker for the preheat that I leave off. My last 1988 bus was also a fuse switch. Nothing on the dash. Of course living in Florida who really needs it.
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2004 M380
1988 WB40 XXV (sold)
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Old 05-31-2019
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Dc2x4drvr Dc2x4drvr is offline
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Default

My preheat switch.
https://www.wanderlodgeownersgroup.c...7&d=1537562960
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2004 M380
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Old 05-31-2019
Born_To_Run Born_To_Run is offline
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Quote:
Originally Posted by Dc2x4drvr View Post
The convenience of the M380 a switch for the engine preheat. Forgot I had a switch on the dash
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2004 M380
1988 WB40 XXV (sold)
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Old 05-31-2019
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NoGas NoGas is offline
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Me too...

My ENG PRE HT switch is also next to the Backup Horn Silencer switch on the dash. There is a green indication in my switch when it is in the ON position. That little pump should NOT be left on all the time! Replacing it when it leaks is a B!! (Yes, I speak from experience). Engine Preheat is NOT the same as the small electric water pre-heater capability, that is provided by electric coils wrapped around heat exchanger inside the H case. Those electric coils are supplied by the 120V AC breaker in the bedroom. The Engine Preheat switch simply turns on a small electric water pump that is inside the Hurricane box and that engine coolant water is circulated in a closed loop from the Hurricane to the engine, then back to the Hurricane. The Hurricane system should be ON (hot) if one expects it to warm up their engine. The coolant inside that loop is supplied by your engine radiator tank. If you were to spring a leak in one of those two lines, you would drain the coolant from your engine . Many M380 owners do not use the small internal electric water heater “capability” because it has a tendency to malfunction and some believe it causes the heat exchanger inside the Hurricane to fail prematurely. That’s why I and many others leave those breakers OFF. The Engine Preheat loop can also be used in reverse (without that little pump ON). This allows the Cummins to supply heat to the Hurricane where it can then be “exchanged” to the radiator loop/circuits inside the coach. This works great when traveling! To use that function, just turn the thermostats ON (and set the thermostat to Furnace with temps as desired), but leave the Hurricane burner switch (kitchen panel below the stove) OFF. Lastly, many have added separate electric water heaters to their coaches. These are true electric water heaters and vary in size from 6 to 11 gallons. See here: https://www.wanderlodgeownersgroup.c...d.php?p=266780 for a description of those by DonB and myself.
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Old 05-31-2019
AEmedic AEmedic is offline
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Thank you guys! Since I have no switch on my dash and the pump is running continuously, I hope that I find that the wires are just run together or left disconnected if it is a normally closed switch.

There seems to be a couple of us missing the switch. I found, by searching, that there was someone else that appears to have the same issues as I have. I don't remember if it was fixed by adding a new switch or by altering the connection. Is there an easy way yo turn off that pump in the meantime?
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2004 M380 DS
Jeep TJ Toad - LS 5.3 swap in process

Last edited by AEmedic; 05-31-2019 at 12:00 PM.
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Old 05-31-2019
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The manuals I have do not show, so far as I can tell, how that switch is wired because the engine preheat pump was optional (from Hurricane). They suggest that power for that pump comes from terminal A1 in the control box. That is the third terminal from the left in the top row of the horizontal 2-row terminal strip towards the bottom of the box.
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2015 Jeep Grand Cherokee
Prior: 2004 M380 Double Slide
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Old 05-31-2019
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So turning OFF the two switches on the side of the main Hurricane control panel should also turn that little ENG PRE HT pump off, correct? (Caveat of NOT turning these OFF while H is running apply, of course)

I’ve been considering adding a dash switch that remotes the two Hurricane panel switches. At present I do not have the remote ON/OFF dash extension some have. So if I want to completely turn the H to OFF, I must do so at the main panel in the bay. Of course, living where there is no Winter means this project is WAY down the list
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Old 05-31-2019
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The lower outside switch would not have an effect on the engine pre-heat - it is the "hot water" switch, and is not connected for those of us with a dash switch for that function. The upper switch should remove power to everything after the short cool-down is run through.
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