Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Alpine Coach Owner's Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Thread Tools Search this Thread Display Modes
Old 02-23-2015, 04:54 PM   #1
Senior Member
tjshively's Avatar
Alpine Owners Club
Join Date: Aug 2010
Location: Cincinnati, OH
Posts: 183
Radiator Fan Runs Continually

2005 Alpine Coach FDDS, 2003 Saturn LW200 Toad

I have been reading about this wax valve.
The radiator fan on my coach runs continually and the water temperature runs around 178 deg. at 65 mph. It goes up to 190 at 75 mph.
Do I have a problem with this wax valve? What is it? Where is it? How do I check it?

tjshively 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 02-23-2015, 05:21 PM   #2
Senior Member
Join Date: Oct 2014
Posts: 571
Does the fan always run on HIGH. The fan is not ON/OFF, it is low speed, high speed, as you need air flow over the CAC (Charge Air Cooler-- aka Inter-cooler, aka After-cooler) to keep intake manifold temperatures where they should be.

And, fan speed should not really be related to coolant temperature except under heavy load conditions.

Said another way, the thermostat is what sends coolant to the radiator (or not). Sure, lots of air flow will cool coolant returning to the engine from the radiator just as will use of the dash heater, but that just means the thermostat sends less coolant to the radiator.

If you get a chance, pull into a rest area on a cool day, flat or descending grade. Leave the engine running-- use cruise to set to fast idle. Best to use a strobe tach to check fan speed OR "feel the air flow"/listen to air flow.

Do the same after a long hard upgrade, particularly at high ambient temperatures.

Any difference in fan speed?

Do the same after a long

wolfe10 is offline   Reply With Quote
Old 02-23-2015, 06:20 PM   #3
Senior Member
Old Scout's Avatar
Join Date: Nov 2005
Posts: 4,223
Do a "search" on this forum--there is a night's worth of reading on this subject. First, manual wax valves were not used on Alpines after 2003 or 04--so your coach has an electronic fan controller. Second, lots of discussion/debate about how fast the fan runs at idle but it is generally viewed that the fan will turn at some number of RPMs, even when the engine is not calling for cool [PS--unlike the wax valve, your electronic controller also ties the dash A/C systems needs for cooling to engine fan speed]. "Assuming" your engine fan is running at high speed continuously, there is probably something wrong with your electronic fan controller. Need to confirm the fan is actually running at high speed, then get the controller checked......
Old Scout
2003 40' MDTS
Garden Ridge, Texas
Old Scout is offline   Reply With Quote

fan, radiator

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
Electronics cooling fan runs constantly wreich1023 Technology: Internet, TV, Satellite, Cell Phones, etc. 3 02-09-2015 01:36 PM
Generator runs but AC power stops after 20 minutes category5 Class A Motorhome Discussions 6 10-11-2014 07:56 AM
Drip rail water runs down side of RV Fife Class A Motorhome Discussions 15 08-27-2014 07:12 PM
Autopark Pump sometimes runs after shutdown thirdwall Workhorse and Chevrolet Chassis Motorhome Forum 4 05-29-2014 02:58 AM
7.5 QD Onan runs only under load Dan440 RV Systems & Appliances 3 12-09-2013 08:48 PM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

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

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.