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Overheating because fan won't come on

Bossandbabe
Explorer
Explorer
Tiffin Zephyr overheated. Towed to Freightliner shop. Fan wasn't coming on. 6 weeks to get part rebuilt, still not fixed. Towed to second shop and after a day of working on it they can't figure out the configuration of the system.
Does anyone have an idea?
Dana and Judy
2000 Tiffin Allegro Zephyr
2012 Jeep Wrangler Unlimited Sahara
9 REPLIES 9

rodcole
Explorer
Explorer
I had a 2005 Frtlnr chassis with side radiator. It had a tendency to overheat. I took it to Gafney, SC, Frtlnr motorhome guys. From the factory the fan modulator was missing. the main thing I learned was that the radiator and cooling system were marginal and the rpm's had to be kept between 1800 and 2100 while in any kind of grade or steep terrain. This was more evident in the earlier chassis, but it solved the problem.
Rod and Candy
2008 Holiday Rambler Endeavor
40' 400 ISL,
GMC Envoy toad,
Lucky Lukas the Miniature Schnauzer

Mandalay_Parr
Explorer
Explorer
Freightliner should be able to plug their computer into the data port and check the fan signal out of the computer/controller.
Then you have the wiring and hydraulic servo valve in tthe circuit.
Course you need good hydraulic pressure as well.

Please keep us posted.
Jerry Parr
Full-time
2005 Mandalay 40B
Cat C7 350, 4 Slides
Blue Ox, Brake Buddy
2004 CR-V Toad
jrparr@att.net
602-321-8141
K7OU - Amateur Radio
Kenwood Radios
ARRL, W5YI, & LARC VE
SKYWARN Weather Spotter

gatorcq
Explorer
Explorer
Call Freightliner 24/7 Help Line. Forget his email ****.
If it is on a FL chassis then They know all about it.
When you call, be at the shop, then speaker phone.
Dale & Susan
DaGirls II Rv - Dakota & Tilly Traveling Companions.
2008 Alfa Gold, 2015 Ford F150 XLT
Roadmaster and Air Brake System
1600 Watts, Magnum Inv/Chg&Solar
800 Lithium Battery
DaGirslRV Blog

Bossandbabe
Explorer
Explorer
Our fan does not work at all. The shop has talked to Tiffin and freightliner and are still diagnosing.
Dana and Judy
2000 Tiffin Allegro Zephyr
2012 Jeep Wrangler Unlimited Sahara

leaddog
Explorer
Explorer
Call Tiffin service department. It's faster resolving problem when speaking with a service rep.
2008 40ft Tiffin Allegro Bus
2014 Honda CR-V AWD

DSDP_Don
Explorer
Explorer
Here is a product to eliminate some of the issues with the side radiator coaches. It senses the temperature of the coolant at the thermostat and tells the engine fan when to come on. It will allow the engine fan to run at variable speeds, which will increase mileage.

Take a good look at this product as a solution to your problem.

Source Thermal valve
Don & Mary
2019 Newmar Dutch Star 4018 - All Electric
2019 Ford Raptor Crew Cab

wolfe10
Explorer
Explorer
Freightliner Gafney 800 385-4357 need VIN

They designed and built your chassis, including cooling package.
Brett Wolfe
Ex: 2003 Alpine 38'FDDS
Ex: 1997 Safari 35'
Ex: 1993 Foretravel U240

Diesel RV Club:http://www.dieselrvclub.org/

Bossandbabe
Explorer
Explorer
I emailed Tiffin. Freightliner Chassis. And yes, to last question.
Dana and Judy
2000 Tiffin Allegro Zephyr
2012 Jeep Wrangler Unlimited Sahara

Mandalay_Parr
Explorer
Explorer
Can you call Tiffin?
Is it on a Freightliner chassis?
Is yours a side radiator driven by a hydraulic motor attached to the fan?
Jerry Parr
Full-time
2005 Mandalay 40B
Cat C7 350, 4 Slides
Blue Ox, Brake Buddy
2004 CR-V Toad
jrparr@att.net
602-321-8141
K7OU - Amateur Radio
Kenwood Radios
ARRL, W5YI, & LARC VE
SKYWARN Weather Spotter