Electric Fan

halburchal · **Posted:** Tue Aug 20, 2013 12:52 pm

My Blue CRD Jeep got hot enough yesterday for it to buzz because I was driving it without the fan installed. But my concern is that the electric fan never came on to cool it down.

Can I test it with 12v?

papaindigo · **Posted:** Tue Aug 20, 2013 3:06 pm

The electric fan just behind the grill is not designed to cool down the engine. It's purpose is to enhance air flow across the AC condenser when the AC is running, which of course will incidentally provide a bit more air flow on thru the intercooler and radiator. Frankly I don't know if that fan runs at all if the AC is off.

That said it's a 2 speed fan and should be testable at the 2 relays or with direct 12v if you can find where the plug is in the line that provides power directly to the fan.

I know some do but I would not recommend running without the mechanical fan. I would recommend a Hayden clutch on that fan and any one of several fan shroud mods that make future access easier.

flash7210 · **Posted:** Wed Aug 21, 2013 7:47 am

halburchal wrote:

My Blue CRD Jeep got hot enough yesterday for it to buzz because I was driving it without the fan installed. But my concern is that the electric fan never came on to cool it down.

Can I test it with 12v?

What were the conditions that caused it to get too hot?
Were you driving at highway speeds or stop and go traffic?
Were you towing?

Does the electric fan come on when the A/C is on?
If not, there is definitely a problem.

You can try pulling one of the fan relays and running a jumper wire into the relay socket.
Be careful and be sure to run the jumper to the correct pin.
Also, that fan can pull 10 or more amps when it starts up. Use 12-18 gauge wire for your
jumper just to be safe.

My testing has shown that with the A/C off, the electric fan will come on at 205 deg F.
It will stay on till the coolant temp comes down to about 180 deg F.

I've been running without the mechanical fan through two florida summers now.
On highways and around town, no overheating.
But I dont ever tow anything.

KD6ICZ · **Posted:** Sun Aug 25, 2013 4:00 am

Where on the heat guage is 230 degrees? The reason I ask is because today when driving in the desert in California on my way to Vegas my heat guage went to lines above the center. It's never done that before. It was 100 degrees outside and I was climbing a very long 7% grade with the A/C on. I also had my foot in it doing about 85 mph. It was sort of a test I suppose.

Still I don't feel the temp should of done that. I'm wondering if the fan clutch is working?

Sent from my XT1030 using Tapatalk 2

flash7210 · **Posted:** Sun Aug 25, 2013 8:31 am

On the CRD temp gauge, one tick to left of center is supposed to be normal operating temp.
But my testing has shown that from one tick-to-left to 12:00 center covers a pretty broad temp
range. About 170-205 deg F.
If your gauge went anywhere to the right of center, the engine got above 205 deg.
However, depending on what year CRD you have and what ECU flash you have, your temp
gauge may not be properly calibrated.
Given your driving conditions, I would say that your gauge is properly calibrated otherwise
the gauge would probably been much closer to H.

At 85 mph you should have had more that enough air moving through the grille. I don't think
either fan could help pull in much more air, working or not.

You were pushing your engine really hard on a really hot day.
The same rules apply to your CRD as they did to your Dads old Chevy pickup...

When driving up a hill on a hot day and you think your engine is about to overheat, turn off
the A/C, slow down, roll down the windows and turn the cabin heat on full blast.

woodtick · **Posted:** Sun Aug 25, 2013 8:55 am

Have you changed your thermostat or coolant or for any other reason had the cooling system open recently? If so, you may have an air pocket(s) if the system wasn't "burped".

If not, other things to check would be radiator plugged with road grit/ bugs, leaves, squirrels, live stock, etc. Also have you added coolant to replenish? if it wasn't HOAT coolant you could have a gelling within the cooling system.

And x 2 on reinstalling the mechanical fan with the Hayden fan clutch as the oem one was junk. Any fuel economy savings gained by eliminating the fan is a financial loser if you overheat bad enough to warp the head and having a head gasket issue.

papaindigo · **Posted:** Sun Aug 25, 2013 10:12 am

Frankly for the price I'd assume any OEM mechanical fan clutch is toast by now and replace it with the Hayden 2905 and while in there do a fan shroud mod to make future access easier. See my post and links at viewtopic.php?f=98&t=64278&p=709322#p709322

As to temp gauge readings see details at http://www.greendieselengineering.com/f ... st/19.page for both the correct CRD readings and readings for a CRD temp gauge that's incorrectly calibrated for a gasser. As I recall the incorrect calibration was an 05 only issue. My 2n 05 had the problem and would appear to overheat pulling 2,000lbs of boat at 65mph of a dead flat FL road at 95F ambient.

KD6ICZ · **Posted:** Sun Aug 25, 2013 11:09 am

I'm running the hot tune. As soon as I backed off the temp went down within a couple of minutes. I had the timing belt changed about 5k miles ago and with that the water pump, thermostat, and coolant. If I remember correctly it was PEAK orange looking stuff that was put in.

The one thing I haven't changed is the fan or clutch. I should probably do that soon.

I'll take a little easier on the way home. I've never seen the heat guage go past the center so it was a shock.

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papaindigo · **Posted:** Sun Aug 25, 2013 12:08 pm

That PEAK orange looking stuff may be part of your problem. The specs for the CRD, not to mention other DCJ, Ford, Mercedes, engines calls for HOAT antifreeze (see my post at viewtopic.php?f=5&t=76362&p=802065&hilit=antifreeze#p802065 for known HOAT antifreezes). I've looked at the PEAK website and there is nothing that clearly states that any of the PEAK products are HOAT or HOAT compatible unless one wants to accept soothing comments to the effect that certain PEAK products are global or universal. As to the cited ASTM D-3306 and ASTM D-4340 they are not particularly helpful.

My :2cents:

do a complete flush (if you have no better way drain and refill with clean demineralized water several times) and fill with proper HOAT antifreeze. There have been several document, with pictures, reports of clogged cooling systems from using other than HOAT antifreeze or mixing antifreeze types (convential, OAT, HOAT)

arengant · **Posted:** Mon Aug 26, 2013 2:43 am

No inline tstat correct?

Mine did the same as yours last year but in South Dakota. I had the Hot tune and inline t stat. I have since replaced mine with an OEM tstat and no more problems still with Hot Tune

My EGT also sky rocketed so I attributed the excess heat to the extra fuel from the Hot tune. To keep the crd going that fast uphill you are probably far enough "into" the pedal to be over fueling.

flash7210 · **Posted:** Mon Aug 26, 2013 8:16 am

I just realized I made an error in my previous posts and have edited them.

The electric cooling fan comes on at 205 deg F.

I am sorry for any confusion or unnecessary stress caused by my error.

GreenDieselEngineering · **Joined:** Sun Jun 07, 2009 5:10 pm **Posts:** 1111

KD6ICZ wrote:

Where on the heat guage is 230 degrees? The reason I ask is because today when driving in the desert in California on my way to Vegas my heat guage went to lines above the center. It's never done that before. It was 100 degrees outside and I was climbing a very long 7% grade with the A/C on. I also had my foot in it doing about 85 mph. It was sort of a test I suppose.

Still I don't feel the temp should of done that. I'm wondering if the fan clutch is working?

Sent from my XT1030 using Tapatalk 2

Your CRD is working normally based on the load and ambient temp you were dealing with. Nothing wrong and it did not overheat.

halburchal · **Posted:** Sat Aug 31, 2013 10:49 am

halburchal wrote:

My Blue CRD Jeep got hot enough yesterday for it to buzz because I was driving it without the fan installed. But my concern is that the electric fan never came on to cool it down.

Can I test it with 12v?

Tested the electric fan. I was doing a TB on my jeep and while the fan was off I put it on my wife's Jeep and started it and turned the air on and immediately the fan started running. so the fan needs to be replaced in wife's Jeep.

I'll look for some replacement options here at LOST Jeeps.

P.S. I finished my TB and I'm now checking for leaks. I also replace the water pump. And since there are so many failures with the Thermostat I decided to go ahead and do the inline option discussed on this forum. Mine is apparently stuck open because it never gets hot. Two test drives and everything looks good so far.

naturist · **Posted:** Mon Sep 02, 2013 7:14 am

Tstats are supposed to fail stuck open, on the theory it is far, far better the engine doesn't reach operating temperature and costs you fuel mileage than it overheats every time you start it and blows your head gasket.

My personal opinion is that the OEM design is greatly superior to the inline design, that the ONLY reason for using inline is to save a quick $100 on replacing a stat. This is a penny-wise, pound-foolish mod, IMHO.

woodtick · **Posted:** Mon Sep 02, 2013 8:24 am

naturist wrote:

Tstats are supposed to fail stuck open

This is true, however, you will not know if it failing all the way open or, if not, if it will open further should the need arise. This is why if it's bad it should be replaced.

naturist wrote:

This is a penny-wise, pound-foolish mod, IMHO.

Also known as spending dollars to save dimes.

BigDieselEv · **Posted:** Mon Sep 16, 2013 8:42 pm

In an unrelated story, I was probing around tonight and removed my fuse cover in the engine compartment. I have no fuses or relays for the electric fan, high speed or low speed or hot wire. Nothing, but I do have empty spaces with copper ready to go. Do you suppose the PO removed them at some point? It was an Alaskan CRD before it got to me. Upon further reflection, that has got to be the case. The fan is present. Just no way to turn it on and/or control it's speed.

Never had a problem with A/C or otherwise. Maybe I'll mosey down to the FLAPS and see what they have in stock in the way of relays and fuses, within the next 6 months...

Electric Fan

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