RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Monaco Owner's 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 08-07-2013, 02:03 PM   #1
Senior Member
Monaco Owners Club
Join Date: Apr 2011
Location: California
Posts: 765
cleaning Charge Air Cooler (CAC)

I have read (somewhere) that the cleaning of the Charge Air Cooler
is important to keep us going down the road.

I have a Roadmaster chassis (RR8R) on my 2006 Diplomat.

I think this photo is about what I have

What is the procedure for cleaning one of these?
Is this a DIY project?


2006 Monaco Diplomat Atrium model, 41'
Cummins ISL-400HP CM850
bukzin is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com 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 08-07-2013, 02:14 PM   #2
Senior Member
adonh's Avatar
Join Date: Apr 2013
Location: Missouri City, TX
Posts: 1,306
Originally Posted by bukzin View Post
I have read (somewhere) that the cleaning of the Charge Air Cooler
is important to keep us going down the road.

I have a Roadmaster chassis (RR8R) on my 2006 Diplomat.

I think this photo is about what I have

What is the procedure for cleaning one of these?
Is this a DIY project?

There is an article in the latest edition of the Diesel RV Club Newsletter (FMCA) on pg 4 by Brett Wolfe on how to do this. DRVC Newsletter 1307-23 sm.pdf

2003 Forest River Cardinal Platinum 37' 5th Wheel
1976 31' Airstream
adonh is offline   Reply With Quote
Old 08-07-2013, 06:07 PM   #3
Senior Member
rgreen45's Avatar
Join Date: Jun 2011
Location: Bradenton, Fl.
Posts: 725
Brett's article is good info. Never use a high pressure washer when trying to clean a radiator or CAC. Garden hose spray first from everywhere you can get at it. After inspecting, if oily residue is present, use the detergents that Brett mentioned. Dawn dish soap is a dead serious grease cutter.
Ray G.
ASE Master Med-Heavy Trucks
RVIA Certified
rgreen45 is offline   Reply With Quote
Old 08-07-2013, 11:54 PM   #4
"Formerly Diplomat Don"
Dutch Star Don's Avatar
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 12,131
bukzin......Most Diesel Pushers use a set up where the Charge Air Cooler (CAC) is sandwiched together with the radiator. The CAC is typically right behind the engine, closest to the engine fan. The radiator is a couple of inches behind that. From the rear engine doors, you typically see the radiator.

The good news is that Monaco built a much more efficient system. They stack the CAC on top of the radiator. When you open your rear engine doors, you'll see one on top of the other. This allows for better air flow and MUCH easier cleaning.

Cleaning......You should have two access covers in your bedroom (some coaches are different). On mine, you can see both hatches and the latches to release them. On yours, you can probably see one, but the one farthest back and the one you need to access may be difficult to distinguish where it's at and to find the screws holding it closed. You might have to look under the coach at the area above the engine fan to see the outline of the access cover.

Once this cover is removed, take a garden sprayer, pour a bottle of Dawn dish soap in it and the rest water. From inside the coach, spray the entire CAC and radiator assembly.

While you're in there, take a flashlight and look down into the corners of the larger metal fan shroud. Often, debris like leaves and paper will collect down in the bottom corners of the fan shroud. Remember, your engine is like a large vacumn, it's suck air form under the engine and pumps it out through the CAC and radiator toward the rear of the coach. I use one of those pinchers where you push the button and the three prongs come out to reach in and grab any debris

Once you've thoroughly sprayed the CAC and radiator, go ahead and close up the engine compartment. You're done inside.

You may get wet, but I use a sprayer wand on a garden hose. From the passenger side of the coach, I lay on the ground and spray/rinse the CAC/Radiator off on the side where I sprayed it. You'll see some dirt in the runoff. Once it runs clean, I start the engine and spray the area again. Now the engine fan is blowing the water through the CAC/Radiator.

You're done! It sounds more complicated than it is. The Monaco design never gets as dirty as the other brands and doesn't require cleaning as often.
Don & Mary
2019 Newmar Dutch Star 4018
2016 GMC Canyon 4WD Crew Cab
Dutch Star Don 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

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:30 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.