2016 Ram 1500 E-fan?

[crazykid1994]

Oops I did sorry .If you want to activate the fan with the truck off,all you need to do is cobble together a switch that you plug into the fan relay circuit,and jump across the fan circuit feed.It's just a normal relay,so you can jump the fan side of it pretty easily.

Well my question is does it still connects to the fan even though there's only 2 wires to the fan? Almost makes me wonder how hard it would be to just bypass the relay altogether and wire in a 2 Speed controller so it runs low at idle like the clutch fan does. Unless that seems pointless. My old car ran 2 speed electric and only hit high speed on hot days or the AC was running. Sorry if it sounds weird. I'm new to working with trucks like this


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[Wild one]

Well my question is does it still connects to the fan even though there's only 2 wires to the fan? Almost makes me wonder how hard it would be to just bypass the relay altogether and wire in a 2 Speed controller so it runs low at idle like the clutch fan does. Unless that seems pointless. My old car ran 2 speed electric and only hit high speed on hot days or the AC was running. Sorry if it sounds weird. I'm new to working with trucks like this


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Personally I think you're over thinking things,lol. Lots of us are running the stock e-fan with a 185 thermostat,and never going over 190F,after you reset the on/off parameters with a tuner.As an interm till you're tuned you can activate the low speed relay by setting the heater controls to defrost,even with-out the A/C being on,but i'd only do that as a very short interm fix.

 

[crazykid1994]

Personally I think you're over thinking things,lol. Lots of us are running the stock e-fan with a 185 thermostat,and never going over 190F,after you reset the on/off parameters with a tuner.As an interm till you're tuned you can activate the low speed relay by setting the heater controls to defrost,even with-out the A/C being on,but i'd only do that as a very short interm fix.

Ok so basically I am going to far with this. If I can get away with the stock fan then I guess I'll wait to do this till I tune the truck. Thank you for your help


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[HEMI-FI]

Just an update, I figured out that the low speed fan relay that is not used is controlled by pin 82 on the PCM of the Hemi truck and pin 82 of the Pentastar PCM is the PWM control signal, I’ve talked to a few techs and we believe that the Hemi low speed fan relay control wire can be programmed in the PCM to a PWM signal. I looked at a stock Hemi Ram HP Tuners file and you can change the signal to PWM signal, however I can’t guarantee it will actually work though. If someone hadn’t stole my HP Tuners cable I would give it a whirl. I have found in the relay box where the PWM Pentastar fan plugs into, I ordered the female Yazaki female terminals to make that connection #7116-3250 for a 8 ga wire, it plugs into the same relay box connector as the single speed Hemi fan positive wire. I found the Yazaki plug kit with terminals to plug into the Pentastar fan on EBay for $15, a stock 80 amp still needs to be purchased. The signal wire that is used for the low speed fan relay on the Hemi that should reprogram to a PWM signal is DK BLU/LT GRN, I found it in the fuse box and shot it to the relay to confirm.

 

[Boosted Motorsports]

Just an update, I figured out that the low speed fan relay that is not used is controlled by pin 82 on the PCM of the Hemi truck and pin 82 of the Pentastar PCM is the PWM control signal, I’ve talked to a few techs and we believe that the Hemi low speed fan relay control wire can be programmed in the PCM to a PWM signal. I looked at a stock Hemi Ram HP Tuners file and you can change the signal to PWM signal, however I can’t guarantee it will actually work though. If someone hadn’t stole my HP Tuners cable I would give it a whirl. I have found in the relay box where the PWM Pentastar fan plugs into, I ordered the female Yazaki female terminals to make that connection #7116-3250 for a 8 ga wire, it plugs into the same relay box connector as the single speed Hemi fan positive wire. I found the Yazaki plug kit with terminals to plug into the Pentastar fan on EBay for $15, a stock 80 amp still needs to be purchased. The signal wire that is used for the low speed fan relay on the Hemi that should reprogram to a PWM signal is DK BLU/LT GRN, I found it in the fuse box and shot it to the relay to confirm.

So you are trying to have a Hi/Lo fan speed come from the factory computer on a 13+ setup?

This was the one thing I noticed the other day when I installed my 09-12 E-fan it has 3 pins on it and the truck harness side only has 2 pins. Fan still works fine but I guess it just comes on full tilt every time? How does the little resistor/thermo sensor work with our current 2 wire -connection?

 

[HEMI-FI]

It basically doesn’t use it, I am using my motor and fan in the V6 shroud, the Hemi fan is about 2” smaller than V6 fan but it works and I’m not even using a resister.

 

[HEMI-FI]

Talking to my tuner about changing the settings to PWM.

 

[icetraxx]

Let me know what you find. I was trying to follow the thread. Are you currently running the 3 wire fan with the existing 2 wire setup by combining the 3rd wire and the power together?

Talking to my tuner about changing the settings to PWM.

 

[HEMI-FI]

He Thinks it will work, but there is only one way to find out and this a 2019 Ram 1500 classic that has no credits, nor the fan, I need to get the computer unlocked.

 

[Ram904]

Here are some videos on the efan conversion. Pretty simple, seems like some overthinking going on here.

 

[HEMI-FI]

The PWM is a better design, I did the conversion on my 16 Ram with the 3.7 fan, it worked good, I just like the Pentastar fan better, more low profile and its PWM.

 

[icetraxx]

I have the Pentastar fan that I bought by accident sitting in storage now. I got an aftermarket fan that is plug an play in there now. I like the pentastar fan as well. That is why I was asking about it working by connecting the 3rd wire to the power to get it to work. I didn't want to start cutting and splicing wires if it didn't work I have the other half of the pentastar fan plug so I would just need to cut the pig tail off of the original a/c fan.

I did something similar to my 01 Sierra. I got a fan from a camero and it dropped right in and it was a pwm fan. I got my tuner to enable the connection on the PCM and confgure the table for it. I ran a wire from the PCM to the 3rd wire on the fan it it worked great. I sold the truck as is and 8 years later I get a im from a guy that bought it. He was wondering what all was done to it and who tuned it.

 

[HEMI-FI]

I need to get a harness to make all this work and just ordered the smart access cable for my 19 Ram, I'd say it's a 50/50 shot this will work, the new body style ram 5.7 already has the PWM fan installed and looks very clean, the part number for that fan is not the same as the Ram 1500 Classic 3.6 unit, so it must be bigger or something.

 

[clint440]

Good luck getting the PWM fan to work on hemi truck. My tuner, Jay Greene was unable to get it to work and neither did the dealer.

I bought a complete PWM fan with pentastar fuse box and harness from a salvage yard. Hemi harness from the firewall forward has the same colored trigger wire as the Pentastar harness so you can plug the fan in and pin the right wire in like it's factory BUT the Hemi PCM does not recognize the PWM fan. Diablosport software can't get it to work and nor the dealer.

I really thought it would a simple programming thing to activate provided you wired in everything like it was a factory pentastar BUT NO. I just ended up using a 3.7 fan. I was disappointed it didn't work but honestly the 3.7 fan doesn't come on that much with a 190 thermostat.

 

[HEMI-FI]

i was looking at the file on HP tuners and shows how can change it from 2spd Fan relay to PWM but that doesn't mean it will work and I also think it might be a OS patch in HP Tuners to get it to work, of whch I'm not sure they have. I do believe anything is possible and I'm a persistent guy but wow!

Do you still have everything or did you sell it?

 

[clint440]

i was looking at the file on HP tuners and shows how can change it from 2spd Fan relay to PWM but that doesn't mean it will work and I also think it might be a OS patch in HP Tuners to get it to work, of whch I'm not sure they have. I do believe anything is possible and I'm a persistent guy but wow!

Do you still have everything or did you sell it?

Yes I have all the fan hardware. I had a donor harness to figure out what wire was the signal wire and where to pin the signal wire off the fan into.

Never tried HP tuners as I don't have it. Diablosport is a no-go, and the dealer couldn't get it to activate either with whatever they use.

Maybe HP Tuners is the missing key....

 

[icetraxx]

If you are using hp tuners you might be able to enable it and copy over the pwm table from a pentastart truck. That is what we did for my sierra. I know I know different maker. We modified the table from a camero and used it. The theory might work with the rams. Change the port to pwm and get the table from a pentastar truck.

 

[clint440]

3.6 Pentastar PWM side



Fan side



Red wire from PMW motor pins into the harness to join the blue wire (with tape) from the harness coming from firewall

 

[HEMI-FI]

View attachment 202494 View attachment 202495 View attachment 202496

You said you have the fuse box as well, right?

 

[clint440]

Yes. PM me for more details.

Here are more pics for everyone's general knowledge:


Fuse Box and harness. I had to unpack quite a bit of the harness to trace out the red signal wire and figure out where it pins to.





Pentastar Fuse Box



Closeup of PWM motor