Electric Cooling Fan Conversion

[autostaretx]

Anyone know of a key on power wire convenient under the hood in the battery area?

Oh, why not do it right and just run a wire from the under-the-seat EK1 terminal strip??



Fuse box #1 is notoriously mechanically flakey (contacts are easily bent to weaken connections, the behind-the-plastic copper bars break free, etc etc)

--dick

 

[az7000']

Yeah, didn’t want to run the cable across the floor and the column was right where it went through the firewall, I’ll get back at it tonight…

 

[az7000']

12.55v at the battery and I can jump it off the house batteries... Continuity over every fuse in block 1 and under the seat. Removed all connections and still a start error. Looks like an aftermarket ground cutoff under the dash, going to try to bypass that next.

 

[tbuyan]

You do want some hysteresis like that so the fan control relay, if there is one, doesn't get worn out.

Excellent use of a little used and little understood word. Hats off to you.

For those scratching their heads: in this context it means deviation from the set point. All control systems must have some degree of hysteresis, by definition; e.g. air compressor on/off switches, cruise control speed settings, thermostats, etc. The trick is to design in the correct amount of hysteresis to prevent over-cycling (as you noted), yet minimize the desired or perceived variation from the setting.

 

[Hellshalfacre]

12.55v at the battery and I can jump it off the house batteries... Continuity over every fuse in block 1 and under the seat. Removed all connections and still a start error. Looks like an aftermarket ground cutoff under the dash, going to try to bypass that next.

Hi. Try removing power from the skreem temporarily via the 10amp fuse under the seat, and then reinstalling it. Then Go for start.

 

[az7000']

All right then, skreem delete and a new Ecu and we are back running. Fan wired in and working well, even installed a manual over ride that was part of the relay set up. The “problem” is the electric fan is so darn quiet! Going for the stress test tomorrow, just wondering how I’m going to tell off the fan is kicking in since I can’t hear it? I have a WiFi camera maybe, just pulling over when it’s hot and checking??
First thought, turn the sensor to the hottest setting and control it with the manual override to learn behavior. Then try to match it with the sensor screw??

 

[bored]

How did you do the skreem delete?

How about this for hearing the fan?

 

[220629]

... just wondering how I’m going to tell off the fan is kicking in since I can’t hear it? ...

Ammeter?

vic

 

[marklg]

Ammeter?

vic

I'd be concerned that if it isn't as noisy, it's not moving as much air. There is pretty much a fixed area, the radiator. The more air that moves through it, the more noise, generally.

Regards,

Mark

 

[tbuyan]

Wire a dash-mounted light in parallel with the fan. Light on = fan working.

 

[az7000']

How did you do the skreem delete?

Precision Ecu in Illinois. You send in your immobilizer box and Ecu, they don’t need the keys since they just disable it. Great service and communication. $395

I'd be concerned that if it isn't as noisy, it's not moving as much air.

I’ll be testing it today. You can hear the fan and seems like a good amount of air, just not very well in the cab over the chugging of the 2.7l.

 

[220629]

There are some electric cooling fan control packages available. I don't know how well they would fit for a Sprinter electric cooling fan conversion.

Amazon.com: Hayden Automotive 3651 Universal Add-On Adjustable Thermostatic Fan Control Kit: Automotive

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Amazon.com: Hayden Automotive 3652 Preset Thermostatic Fan Control: Automotive

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vic

 

[az7000']

I have these, was not pulling near enough air. I set it to go on at 200-205 by just pulling over and adjusting the little set screw. The fan seemed small and I had to offset it to clear the water pump. Even with the manual switch on it couldn’t keep up. Disappointing last month trying to fine tune a minor issue….

Flexilite.

Security Check

https://www.flex-a-lite.com/accesso...e-electric-fan-controller-with-relay-kit.html

 

[220629]

I have these, was not pulling near enough air.
... Even with the manual switch on it couldn’t keep up. ...

Has anyone discovered how much HP the engine fan uses when locked on and spinning at 90% of the pump shaft speed? That should give an idea of what will be needed to duplicate the electric fan air flow needed.

The electric fans probably won't benefit much from the OEM plastic fan shroud design. That must be a factor overall.

vic

 

[bored]

Has anyone discovered how much HP the engine fan uses when locked on and spinning at 90% of the pump shaft speed? That should give an idea of what will be needed to duplicate the electric fan air flow needed.

The electric fans probably won't benefit much from the OEM plastic fan shroud design. That must be a factor overall.

vic

Did you ever figure this out?

 

[az7000']

Flex-a-lite did say they would recommend the best set up if I was able to send them some dimensions. I went back to OEM.

 

[bored]

Thanks.... I will reach out to them.

 

[smcguyer]

would be interesting to do an experiment if the condenser fan has any appreciable effect on coolant temp when AC is off

Relay #4 under the seat, drop in one of these relay jumper/testers

View attachment 173993


maybe I will test when summer temps come.

The condenser fan really only cools the condenser. It will not appreciably cool even the intercooler. I have posted (a lot) on the thermodynamics of the Sprinter cooling system... look up prior posts if you are curious. You can test this yourself if you have a Scanguage (monitor the inlet temperature after the intercooler and compare to ambient). I use a 50 amp switch to turn on my condenser fan manually in hot, in city driving in the summer.. takes stress off the compressor (and puts it on the alternator, lol). Use overkill wiring, the big fuse is under the seat. No wimpy wires or switches when big motors are involved!

 

[Drifter957]

All right then, skreem delete and a new Ecu and we are back running. Fan wired in and working well, even installed a manual over ride that was part of the relay set up. The “problem” is the electric fan is so darn quiet! Going for the stress test tomorrow, just wondering how I’m going to tell off the fan is kicking in since I can’t hear it? I have a WiFi camera maybe, just pulling over when it’s hot and checking??
First thought, turn the sensor to the hottest setting and control it with the manual override to learn behavior. Then try to match it with the sensor screw??View attachment 189350

Where didu get new ecu and sceem delete

 

[az7000']

Precision ecu near Chicago. Could mail it Monday and have the stuff back by Friday