Overheat no rad fan

Overheat no rad fan

This is a discussion on Overheat no rad fan within the RAM 1500 Diesel Electrical forums, part of the RAM 1500 Diesel Garage - RAM 1500 Diesel Mechanics Corner category; Water temp got up to 250 and chimes started. Pulled over, turned on heater. Thought maybe low coolant, but level is fine. Then I noticed ...

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    dub
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    Overheat no rad fan

    Water temp got up to 250 and chimes started. Pulled over, turned on heater. Thought maybe low coolant, but level is fine. Then I noticed the rad fan wasn't running. I thought maybe blown fuse. The diagram under the fuse box lid says k1 rad fan lo, k2 rad fan hi, f1 rad fan power, f3 rad fan hi/lo. All those spots are empty in my fuse box. What gives?

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    RAM Regular fjrmann's Avatar
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    empty, as in no fusible links with out fuses, or no fuses?
    '15 Granite Crystal Laramie CC 4X2 Short Bed, 3.92 Rear

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    dub
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    Empty as in no fuses in those spots. There is a place to plug them in, but they are vacant.

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    dub
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    Picture. Top middle. The two 4 pole relay plugs are k1 and k2. In between them are 2 spots for cartridge fuses, f1 and f3.

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    dub
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    If those aren't there how is it possible for the rad fan to work at all?
    Maybe they weren't there from the day I picked it up and I've never had an overheat problem because it's been winter?

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    RAM Guru roegs's Avatar
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    Here is the panel from my '15 Limited. Just did a quick glance, but they appear to look the same.

    Overheat no rad fan-img_0431%5B1%5D.jpg
    2015 RAM 1500 Crew Cab Ecodiesel Limited, 3.92 gears, air suspension, towing package.

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    RAM Veteran steiny93's Avatar
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    Quote Originally Posted by dub View Post
    If those aren't there how is it possible for the rad fan to work at all?
    Maybe they weren't there from the day I picked it up and I've never had an overheat problem because it's been winter?
    winter in Nevada is still going to need a fan; with zero fan action you'll overheat in the first bit of traffic, even if its below freezing

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    dub
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    Excellent, thanks for that picture, roegs. So obviously the relay and/or fuse for the fan must be somewhere else.

    Agreed, steiny. I thought about it some more and realized there is no way that my fan hasn't been working from day 1. Back in March I towed 1100 miles down to southern California and back, including over the Grapevine and didn't have any problems. The fan must have stopped working just recently.

    I made this thread on the side of the road while I waited for the motor to cool down. Once it did, I turned around and came back down the grade I was driving up and all the way home. On flat ground the temp never got above 212 f. Once I got home I cranked the A/C and let it idle. It got up to 221 f and the fan never came on, although I'm not sure if it was supposed to.

    I guess my next stop is the dealer; dammit, not even 10,000 miles yet.

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    RAM Silver Member Anomaly's Avatar
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    I am disappointed that the manual isn't always correct. This could cause no end of trouble in a situation where you may be stranded. I checked for the location of the fan fuses in my manuals and this is what I found. Iit does say "if equipped" and I believe that it is.

    Overheat no rad fan-fan-fuses.jpg
    Gene

    2014 RAM 1500 Ecodiesel
    2001 GMC 2500HD Duramax diesel
    1992 Ford E350 Navistar diesel

    "Science prevails over bullshit and superstition"
    -Me

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    dub
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    Yep, that's what my manual says as well. Obviously the truck is equipped with a rad fan, I can look and see it sitting there.

    If you look at the pics that roegs and I posted of our "Power Distribution Centers", F1 and F3 are vacant. You would certainly expect them to be there based upon the manual, but alas they are not.

    Additionally, if you look at the diagram under the fuse box lid, it gives some more information. K1 and K2 are supposed to be the Rad Fan Hi and Lo speed relays, but they are also not there.

    There must be a relay and/or fuse controlling the fan somewhere, but for some strange reason they are not in the fuse box.

    I called the dealer and obviously they were not any help, just told me to bring it in. I would like to do some trouble shooting myself, but I'm searching for some more information.

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