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Ram 3.6l Radiator Fan Temp #5426200 05/11/20 09:39 AM
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oilchangeguy Offline OP
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Does anyone know of a kit I could buy to control (change) the temp that the radiator fan starts at? I just cant get over the occasional 230 degree reading. The fan doesnt start till about 226 degrees. They say its normal, but...... I tried Royal Purple Ice, but no change.

Thanks

Last edited by oilchangeguy; 05/11/20 09:40 AM.

2015 Dodge Ram 1500 QS Ultimate/ Mopar Filter
2017 Ford Edge SE QS Ultimate/ Motorcraft Filter
Re: Ram 3.6l Radiator Fan Temp [Re: oilchangeguy] #5426210 05/11/20 09:59 AM
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Chris142 Offline
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225F is normal for most electric fans. It is ran by the computer.


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Re: Ram 3.6l Radiator Fan Temp [Re: oilchangeguy] #5426217 05/11/20 10:05 AM
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kschachn Offline
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What is your concern or problem with the way it is operating? I don't understand.

And no, a (useless) coolant additive isn't going to change the setpoint for turning on the fan.


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
Re: Ram 3.6l Radiator Fan Temp [Re: oilchangeguy] #5426231 05/11/20 10:20 AM
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ragtoplvr Offline
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Normal operating temp is about 190F or about 87F this is only 20 degrees c hotter. It helps bake out any accumulated water and fuel from the oil. Constant that hot would be a concern, but idle and light loads for part of the cycle is actually beneficial.

Rod

Re: Ram 3.6l Radiator Fan Temp [Re: oilchangeguy] #5426234 05/11/20 10:23 AM
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Miller88 Offline
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Most modern engines like 220F or so. Really helps with emissions.


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Re: Ram 3.6l Radiator Fan Temp [Re: oilchangeguy] #5426236 05/11/20 10:23 AM
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simple_gifts Offline
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I'd be spending my $$ on why you can't get over it. j/k.

Do you have a temp gauge? How are you getting your #s?


2004 Prius; 131K; ATM
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Re: Ram 3.6l Radiator Fan Temp [Re: oilchangeguy] #5426248 05/11/20 10:35 AM
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oilchangeguy Offline OP
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In other words, it is normal. I'm old school and still feel like anything over 210 is overheating. Guess I'll quit worrying about. Yes, is only ever gets to 230 if I am sitting in traffic or running 5 mph. Most of the time it runs 215 to 225.


2015 Dodge Ram 1500 QS Ultimate/ Mopar Filter
2017 Ford Edge SE QS Ultimate/ Motorcraft Filter
Re: Ram 3.6l Radiator Fan Temp [Re: oilchangeguy] #5426254 05/11/20 10:42 AM
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Gebo Offline
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This a LONG shot but do you use premixed coolant or do you mix your own?

I have read that if you get a higher concentration of coolant vs water, that you would decrease cooling capacity as it is the water that actually does the cooling.

I would guess yours is already premixed. If you are mixing your own, make sure it is 50/50 coolant/water.


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Re: Ram 3.6l Radiator Fan Temp [Re: Gebo] #5426263 05/11/20 10:51 AM
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kschachn Offline
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Originally Posted by Gebo
This a LONG shot but do you use premixed coolant or do you mix your own?

I have read that if you get a higher concentration of coolant vs water, that you would decrease cooling capacity as it is the water that actually does the cooling.

I would guess yours is already premixed. If you are mixing your own, make sure it is 50/50 coolant/water.

Like the water wetter additive, coolant concentration is not going to change the setpoint for fan activation. It's not about heat capacity or transfer it's about temperature.


1994 BMW 530i, 252K
1996 Honda Accord, 288K
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Re: Ram 3.6l Radiator Fan Temp [Re: oilchangeguy] #5426276 05/11/20 11:07 AM
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JTK Offline
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There was another similar thread around on this topic so forgive me if it's been talked about..

What ambient temps and driving conditions are you seeing that 230F dash reading? Is your engine oil temp running similar temps at that time?

I wouldn't suspect the active grille shutters as they'll throw a code if they're not in the proper position.

I've seen maybe ~217F coolant and engine oil temps on my 2017 Ram 1500 pentastar, sitting at a stop light with the a/c cranking after a ~35 mile run on a 90deg day, but they're normally around the 185-205 range winter-summer. They do vary widely between winter and summer.

Last edited by JTK; 05/11/20 11:08 AM.

2019 Nissan Pathfinder SV
2017 Ram 1500 4x4, 3.6L.
2015 Nissan Versa 1.6 S
Re: Ram 3.6l Radiator Fan Temp [Re: oilchangeguy] #5426319 05/11/20 11:51 AM
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tcp71 Offline
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Here is a stock fan speed control chart the computer uses to adjust fan speed on a 2015 F150. The fans go from low to high speed at 220F and to max speed at 226F. What you are seeing in your RAM is completely normal for a modern engine.

[Linked Image]


2016 F150 Eco: Edge 0w40
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Re: Ram 3.6l Radiator Fan Temp [Re: oilchangeguy] #5426426 05/11/20 01:28 PM
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big_guy Offline
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Originally Posted by oilchangeguy
Does anyone know of a kit I could buy to control (change) the temp that the radiator fan starts at? I just cant get over the occasional 230 degree reading. The fan doesnt start till about 226 degrees. They say its normal, but...... I tried Royal Purple Ice, but no change.

Thanks

An override switch to trigger fan on and open shutters would be ideal.
I used the heat fan to trigger the engine fan to come on at stand still dropped temps 10 or 15 degrees rather quickly...
I recently removed 4 grill shutters from each side. Jury still out on it... but I can say warm up times are longer so shutters will go back in for next winter.
2019 Ram 1500 CLASSIC 3.6

Last edited by big_guy; 05/11/20 01:29 PM.

2019 RAM 1500 CLASSIC SXT PLUS QUAD CAD 4X4... 3.6L
Re: Ram 3.6l Radiator Fan Temp [Re: oilchangeguy] #5426488 05/11/20 02:28 PM
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oldhp Offline
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big_guy, I took one out of each side, right on top of the center divide cross bar. Works perfect. Engine still warms up the same, but now I don't see those 218° to 222° driving 75 MPH on the interstate pulling nothing temps. 2018 reg cab 2wd/8 speed auto.
Engine stays 190°-195° now with the oil temp 195°- 200°.

Last edited by oldhp; 05/11/20 02:30 PM.

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Re: Ram 3.6l Radiator Fan Temp [Re: oilchangeguy] #5426638 05/11/20 05:37 PM
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390pi Offline
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The coolant in my Ram 1500 3.6 runs the same 215-225* Occasional 230* but then drops down to 220*or so. Towing up grades oil can get to 240-243* @ 70* ambient, 5k towed weight, then drops back down.

Took photos of dash, different speeds, oil/coolant temps , ambient temps, etc. Dealer found no problem...

I feel the same- like it is too hot, but it isn't.

Took the fuse out of the grill shutter as an experiment.
Ran much cooler. Less than 200* Eventually threw a code after 4 start cycles.


2019 Ram 2500 4x4 6.4
2016 Ram 1500 4x4 3.6
2015 Jeep Grand Cherokee AWD 3.0 Diesel
2000 Chev Suburban 4X4 2500 6.0
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Re: Ram 3.6l Radiator Fan Temp [Re: oldhp] #5426668 05/11/20 06:12 PM
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big_guy Offline
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Originally Posted by oldhp
big_guy, I took one out of each side, right on top of the center divide cross bar. Works perfect. Engine still warms up the same, but now I don't see those 218° to 222° driving 75 MPH on the interstate pulling nothing temps. 2018 reg cab 2wd/8 speed auto.
Engine stays 190°-195° now with the oil temp 195°- 200°.


Thanks for the input. Sounds like a great option. I will probably wait till fall now to add some shutters back in but we'll see.


2019 RAM 1500 CLASSIC SXT PLUS QUAD CAD 4X4... 3.6L
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