Community Forums

spinroch · 03-11-2017, 04:37 PM

I had the problem in my 1995 class C with a small block chevy engine. As it was random, occurring at different speeds, it was quite annoying. I stopped at an auto parts store and bought a new thermostatic fan/clutch assembly. I changed it right there in the parking lot (always bring your tools!) and I had no more issues.

Fletcher0077 · 03-11-2017, 09:14 PM

When the fan kicks in with the 195 deg therm it must mean the air temp through radiator reaches the fans turn on temp.
When the fan kicks in with the 180 deg therm installed (as it does with mine) it must mean the air temp through radiator reaches the fans turn on temp.

Wouldn't this mean the engine is still getting up to higher temps, just not as often. Which might/would keep all bad things mentioned in previous replies under control?

spinroch · 03-12-2017, 06:10 AM

In my case, the fan clutch was bad. Of course, I was watching the temperature gauge. YMMV

LETMGROW · 03-12-2017, 06:46 AM

Quote:

Originally Posted by db71

The first time mine did it, I knew right away what it was. To me it wasn't loud at all because when the fan on my old 1992 Bounder kicked on it sounded like you were inside of a jet engine

What the OP is hearing is normal for the fan operation. If he stops hearing it then it is time to worry.
The fans on MH's are normally larger than your daily driver hence they are moving a much larger volume of air. You are also sitting almost on top of the fan and radiator with just a thin cover between you and the fan.
I want to hear my fan. I know it's working properly.
Lynn

4x4van · 03-16-2017, 08:24 AM

Quote:

Originally Posted by lrsses

Do you have a back up or rear camera with volume control if so turn off?

iRV4FUN · 03-16-2017, 01:37 PM

Pulling my 8.1L with a 180 T out of winter storage

and can't wait to hear that roar! Except my roar will be from my Banks headers.

Scarab0088 · 03-16-2017, 01:41 PM

Quote:

Originally Posted by lrsses

Do you have a back up or rear camera with volume control if so turn off?

Quote:

Originally Posted by 4x4van

Guessing lrsses thinks it's a rear engine 8.1L Workhorse...that was the case on the UFO, but not the great majority of Workhorse - front engine gas chassis'

Safe travels

4x4van · 03-16-2017, 03:21 PM

Quote:

Originally Posted by Scarab0088

Guessing lrsses thinks it's a rear engine 8.1L Workhorse...that was the case on the UFO, but not the great majority of Workhorse - front engine gas chassis'

Safe travels

Ahh...gotcha.

SteveM07825 · 03-18-2017, 10:03 AM

First time I heard the Jet noise I wondered WTH.. Turned out to be the HUGE rad fans spinning up.. Truly sounded like a Rolls Royce RN211 spoiling up to full power..

scenic route · 03-18-2017, 11:15 AM

Pulling a steep grade out of Webster Springs, WV. was the first time I heard the jet under the hood. I thought I'd burned up the transmission and stopped...unhooked the Jeep and pull out the dip stick for a sniff check. All seemed to be OK and soon found out that all was normal and that the computer had things under control. Heard that sound many times during the 5 years we own the HR. Sooo...Relax and enjoy the noise.

Toddgr · 03-20-2017, 02:08 PM

Here in Phoenix it gets a bit toasty in the dead of summer. My fan can kick on when I'm on level ground at 65mph. Get used to it. It makes me warm and fuzzy inside

Kountry 2SUM · 03-24-2017, 06:12 AM

I installed a 16" electric fan on a previous motorhome, an F53. Our current Mountain Aire is not loud at all, not nearly as loud as that Ford. Installing the electric fan cut the cycles of the steel fan in half. Took 2 hours to install the fan, most of it stringing wires.

The insulation on the dog house area of this Mountain Aire must be really good as the fan seldom even gets my attention. Putting more insulation might be the answer.

db71 · 03-24-2017, 09:12 AM

Quote:

Originally Posted by LETMGROW

What the OP is hearing is normal for the fan operation. If he stops hearing it then it is time to worry.
The fans on MH's are normally larger than your daily driver hence they are moving a much larger volume of air. You are also sitting almost on top of the fan and radiator with just a thin cover between you and the fan.
I want to hear my fan. I know it's working properly.
Lynn

LETMGROW,

You are absolutely correct, on a trip to the Oregon coast in the 1992 Bounder, I noticed the roar was absent climbing over the coast range and my temps were starting to climb. Pulled over and found out the fan clutch had completely gone out( fan would free spin with no resistance)

Luckily, back then i would carry as much stuff from my shop that the Bounder could fit(yes it was most likely over weight). Buried in one of the storage compartments I had a big electric fan that I zip tied to the radiator and wired it to a toggle switch on the dash. We finished the trip without any overheating issues and replaced the fan clutch after returning home. I ended up leaving the electric fan on the front of the radiator as back up insurance , but improved the wiring with a bright red light on the dash so I wouldn't forget about it being on.

The OP may not like how loud the roar is, but will like things alot less if he doesn't hear it.

MIKEBEQ · 03-26-2017, 10:54 AM

Make sure you check your coolant properly and regularly. Our fan was coming on regularly the first day or our trip last summer. It was pretty hot so not unexpected. We checked the coolant before heading out the next morning and had to add a fair amount of water. Later that day when heading up a long low grade into WY, steam suddenly came pouring out of the front end. We shut it down right away and subsequently spent $3000+ to replace what we were told was likely a partially plugged radiator. Without going into detail, I learned a LOT about how cooling systems work and suspect now that the problem was that we simply ran low on coolant because we didn't know the correct procedure to check and fill it. (Even though there's enough coolant in the overflow tank it doesn't mean there's enough in the radiator.)