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Pickups Dodge Dakota Dodge Dakota - FAQs
241 messages, Last post on Dec 31, 2007 at 3:13 PM
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Noise produced by the fan clutch on a Dodge truck is normal. The Dodge engines use a viscous clutch fan that permits reduced load and subsequent loss of horsepower at high speeds, yet increased cooling capacity at low speeds. These fans contain a high density silicone filled coupling that connects the fan blades to the water pump shaft. This design utilizes a thermostatic bimetallic coil spring that reacts to the temperature of the radiator discharge air. As the discharge air temperature through the radiator approaches 165 to 180 degress F, the bimetalic exerts pressure against a slip clutch and allows power of the water pump shaft to be transmitted through hydrostatic coupling to the fan assembly. This raises the speed of the fan blades and increases air flow through the radiator to provide increased cooling. Sometimes after a vehicle has been driven to operating temperature the bimetalic spring may expand to the maximum coupling position due to localized heat from the engine or radiator after shutdown. After a cooling period the spring may not contract or contract fully. Upon restart the expanded spring causes the fan to spin at engine RPM until enough cool air has been drawn through the radiator, Then the spring contracts. This is what causes that momentary period when the fan is heard after restarts. Testing the Fan Clutch Assembly If the fan assembly free-wheels without drag for more than five revolutions when spun by hand, the fan clutch assembly is defective. This test must be conducted when the engine is completely cool. Fan drive engagement begins when the radiator discharge air flow is between 165 to 180 degrees F. Disengagement begins when the air flow temperature is between 135 to 175 degress F. There should be no perceptible lateral movement of the fan blades. If so, the fan assembly is defective. Regards, Dusty |
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Replying to: steak2k1 (Aug 08, 2006 9:39 pm) It wasn't me but Bpeebles, who by the way has given some very good advice. The bypass thermostat is available from any Dodge dealer. As Bpeebles pointed out, a lower operating temperature will affect emission controls and cause less than optimum engine and vehicle operation. Long engine warm-ups and increase fuel consumption can result. In addition, because of the way the bypass type thermostat operates by providing bypass galleries in the engine block with coolant, you may actually find that a non-bypass thermostat might cause engine block hot spots. What this might cause I do not know. However, 4.7 equiped Dakotas tow very well in all temperatures from my experience. If you've encountered overheating I would first suspect something else is wrong, either the radiator is partially blocked, the thermostatic fan clutch is defective, or the radiator fan motor is inoperative. Best regards, Dusty |
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Hey Bpebbles...no nead to lecture..OK?? For one and as I said previously, I re-installed the OEM 195 deg Tstat. After that, I had done, professionally, a complete cooling system change. (non Glycol type). All this was three weeks ago and prior to my vacation trip. I do appreciate the technical explanation of the "bypass". ..a 180 is not in the picture. The Hwy I traveled is called Hwy #3 in Southern BC. Check it out. And I can tell you that towing 4300 lbs (checked on the scale), on an 8% grade, at 4-5000' Above sea level and at an outside ambient temperature of around 90+F with a tail wind..It overheated. Ie; the engine temp light came on. The temp gauge was about half way between middle and Overheat. Now, do I believe there is/was some other thing wrong with my motor..?? No, not at all. It was damned HOT is all.! The motor worked damned HARD is all.! 1st gear at 4500 rpm It was damned STEEP is all.! I was towing 4300 lbs is all. Let me tell ya that this climb was an itch with a B.! This was not the little hills in the Adirondaks of up State NY nor the so called "Rockies" of Idaho cause I've driven those and they are nothing campared to what we have here. Don't believe me..?? Y'all come and see for your self. No Offense Dusty, but just about anything would have overheated in those conditions..!! As a matter of fact we were not the only ones pulling over in the conveniently placed rest zones (every 300 m) on the shoulder overlooking a 700' drop to the valley below. And ya know, we only had to pull over twice right near the summit. So IMHOP it was not really a huge deal although I was concerned at the time. Traveling on ~flat type of terrain, these units tows very well indeed. Given I use Premium gas and I use synthetic lubes all round...Bpebbles would be happy to note that I indeed took his advice and used Redline.! Overall am quite pleased at how the unit performed. But towing in the CDN Rockies is another story. Short of putting a larger engine with way more low end torque and or different gear ratio..not much else to add to this pupply. 'cept the chip. Not to worry guys, I promise I won't look at another Tstat again.! (-%  Theo
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Replying to: steak2k1 (Aug 13, 2006 8:12 pm) If you wish to chat about your dakota or ask questions -- there are several other forums here on edmunds that are better suited than this FAQ forum. |
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That's fine. I too learned. However it did come across as such. Ergo the comment. Theo |
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I have a 2001 dodge dakota sport quad cab with over 100,000k mi now. My Check eng light came on about 5 or 6,000 back. I haven't done anything quite yet with it but figured i find out if anyone could help me before i start looking at basic troubleshooting procedures. Thanks
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Replying to: fiafia6 (Mar 18, 2007 1:11 pm)
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Replying to: sunburn (Mar 18, 2007 3:23 pm) Then go to this website or here, or here to look up what the codes mean. |
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Replying to: andy_jordan (Jun 27, 2000 12:23 pm) |
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| When I excellorate with my 2002 dakota it revs up and then goes, even though it is all the way in gear. any one know the problem I have an automatic | |
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