Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE CHASSIS CLUB FORUMS > Workhorse and Chevrolet Chassis Motorhome Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 09-14-2021, 07:36 AM   #1
Senior Member
Newmar Owners Club
Workhorse Chassis Owner
Join Date: Apr 2018
Posts: 180

What are your thoughts on going with A 180o thermostat?

2003 Newman Kountry star 33.4'
Workhorse W-22 Gasser
Tawas, Michigan
Floyd2u is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free! RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 09-14-2021, 08:01 AM   #2
Senior Member
yeloduster's Avatar
Workhorse Chassis Owner
Join Date: Sep 2017
Posts: 1,653
Your computer controlled engine is designed to operate at 195F. If you lower the thermostat the computer thinks the engine is a little cold and adds more fuel to compensate. I think you will only notice the difference in your wallet at the fuel pump. Lowing the operating temperature will probably increase your fuel consumption.

Engine temperature is a balancing act. Hotter engines are more efficient because the fuel atomizes better, ignites better and burns more completely. GM engineers think the 8.1L engine runs best at 195F so they programmed the computer to optimize operation at that temperature.

I will leave mine at 195F. I'm not opposed to modifications. I do it all the time and if I could justify the expense I would add headers and maybe a cold air intake. Higher ratio rocker arms might make her breath better and modification to the intake manifold have proven to be effective. All cost more than I am willing to spend. On the other hand, I think Workhorse motorhomes are geared too high for continuous mountain use like I do. I'm considering going from a 4.88:1 differential gear to a 5.38:1.
2003 34' Georgetown on W20 Workhorse Chassis. UltraRV power mods. Doug Thorley Headers and MagnaFlow 12589 mufflers. Front Sumo Springs, Rear P32 Sumo Springs, UltraRV Track Bar.
1998 Jeep Toad.
yeloduster is offline   Reply With Quote
Old 09-14-2021, 09:30 AM   #3
Senior Member
Join Date: May 2018
Location: Minnesota
Posts: 391
I have a 454, not an 8.1 and I went with an alternate thermostat. Thought the MH ran too hot, especially when working the motor. I suppose that's the case for everyone but it made me uncomfortable.

This is actually my first big block. The previous MH had a 360 and I also went with an lower temp thermostat there. I thought the clerk at NAPA made a mistake when he gave me the replacement for the 454 as it looked small in comparison to the thermostat in the 360, like it'd be better suited to a lawn tractor.

Don't know if your tranny cools though the radiator or if you have something else like an added cooler or a deeper pan, but I've been told heat is the number one killer of transmissions. That and always running hot was enough for me.
MinntoMich is offline   Reply With Quote
Old 09-14-2021, 10:54 AM   #4
Senior Member
Workhorse Chassis Owner
Join Date: May 2005
Posts: 666
I switched to the 180 degree thermostat years ago and couldn't me happier. Number one, it does not cause more fuel consumption. Mine has stayed the same through the years. There is no loss in power and the engine runs just fine. The one thing you'll notice is that the centrifugal fan will kick in at a little lower temperature and slower speed resulting in less noise as it cycles in and out. Don't get me wrong. When it's hot outside or you're pulling a grade and the engine gets up to 200 and above, the centrifugal fan will spin at full force and full roar.
Fred Kennerson
2003 Dolphin L/X 6320
Yucaipa, Ca
kennersonf is offline   Reply With Quote
Old 09-14-2021, 12:27 PM   #5
Senior Member
Join Date: Aug 2020
Location: Ohio
Posts: 2,120
Thermostat is cheap.. easy to change... experiment.. it's your coach.. on mine.. 2000 454 Chevy.. no cats.. cold air intake.. I run 160.. I don't use much in winter... so play around find out what works best for you.. yes if you had 1 million dollars in testing equipment.. you might be able to detect very tiny mpg difference.. we talking in relative terms 0..

The only reason the manufacturer put in 195 is to pass smog cops cooperate emission.. that is all.. and I had mine tested after adding 160 and still well with in limits..
The colder you can run the longer it will last.. only exception I found is those who run in deep cold.. just use good old cardboard to cover what you need to keep temp satisfactory..

Goggle oil temps versus trans and eng life.. make your own decisions.. experiment.. learn.. really most people don't care to keep that long or trade up.. because technology is changing so fast.. if you plan to keep.. run cold as possible..

Don't believe me? Read up on how 195 degrees thermostat came about.. why did most pre-emmision vehicles use 165 or 170.. good luck and let us know what you did and maybe better members then me will help you oh yes computer will adjust for colder thermostat.. but will do just fine..
2000 southwind storm, workhorse custom chassis with 7.4l vortec
donr103 is offline   Reply With Quote
Old 09-14-2021, 05:44 PM   #6
Senior Member
Workhorse Chassis Owner
Join Date: Jun 2006
Location: Northwestern Montana
Posts: 3,505
I have been running my 8.1 motorhome for 14 years with a 180 degree thermostat. The fuel mileage was not affected with its installation, nor was the engine performance. The amount of time and degree of engagement of the viscos fan was the main reason for installing it. The only negative side I have experienced is less heat from the dash heater. We donít RV in winter much, so the trade off for a quieter operating fan is well worth it to me.
And yes, it will pass smog inspection
dieselclacker is offline   Reply With Quote
Old 09-15-2021, 01:52 PM   #7
Senior Member
Newmar Owners Club
Workhorse Chassis Owner
Join Date: Apr 2018
Posts: 180

After much reading & searching this web page 180o thermostat wins.
Thanks for all your input.
2003 Newman Kountry star 33.4'
Workhorse W-22 Gasser
Tawas, Michigan
Floyd2u is offline   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Replacing Duo-Therm thermostat with Hunter thermostat tpcollins Class A Motorhome Discussions 4 10-02-2018 02:10 PM
Remote thermostat for roof air residential thermostat swap?? supertramp Travel Trailer Discussion 6 01-12-2017 08:39 PM
Upgrade Duo-Therm thermostat to a Honeywell RTH230B Thermostat Ray Wallace RV Systems & Appliances 7 12-07-2009 08:22 PM
AC, Furnace Thermostat Problems EngineerMike Alpine Coach Owner's Forum 0 02-03-2009 12:26 PM
Propane thermostat vs. True-Air electronic thermostat John_Canfield Winnebago Industries Owner's Forum 5 10-18-2005 02:32 AM

» Featured Campgrounds

Reviews provided by

All times are GMT -6. The time now is 01:20 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.