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Mikey
Dodge Dakota
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12/18/2006
12:37:35
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 Subject: Fan Clutch
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Message:
Is it unusual for my fan to not stop turning(I have a 99' 5.2 150000kms w/belt driven fan). I'm asking this because my engine temp never gets more than a quarter of the way up on the gauge. I have put in a new thermostat and even tried to put in a airdam up front, but nothing is working.
I have thought about the heater core being plugged but that would not make for low engine heat, just poor heater heat,right?
If the fan never stopped turning(if that's how the clutch on the fan is supposed to work) would that account for the engine not warming up properly. The Haynes manual says there should be a little bit of resistance when you move the fan by hand with ignition off. But what do they consider a little bit. Mine spins pretty freely.
I live in Winnipeg,Canada so it's going to start getting cold.
A buddy of mine with a Ram 5.2l says he has wicked heat, so I should be able to get better than I have.
Any help on this would be great!
Thanx in advance.
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gen1dak
Dodge Dakota
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12/18/2006
18:30:08
|  RE: Fan Clutch
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Message:
If you can get more than half a spin from a vigorous flick of the fan, it's toast, but being loose, it'll pull less, not more air. You may have a partially stuck engine thermostat, or partially clogged heater core. Could also be a bad heater control valve.
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?
Dodge Dakota
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12/21/2006
07:46:30
| RE: Fan Clutch
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Message:
Temp gauge better reading -quarter of gauge only
Higher means overheating..
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Mikey
Dodge Dakota
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12/21/2006
14:39:09
| RE: Fan Clutch
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Message:
I'm freezing in there when it's -30c outside so I want it to read higher.
Only a quarter of the way up in the summer would be great.
Should I be able to hear the flap for the heater core open when I switch the dial from cold to hot. Cause I can't hear any flap opening up.
Thanx
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OBIO3
Dodge Dakota
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12/22/2006
20:06:36
| RE: Fan Clutch
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Message:
First off, the cluch fan should only spin fast for the first 3 or 4 minutes from a cold start or long enough when engine gets a bit overheated to cool it down. Even if the fan cluch is locked up the truck will still heat up to normal. The thermostate controls temperature. Also at 1/4 guage reading your heater should be throwing slightly warm air. Your saying iy throws cold air. If so, you have 2 problems . The air dam is not changing to heat and your thurmostate is either staying open or is the wrong one for your engine making it not fit proper.
So many problems .... So little time
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Red99DakR/T
Dodge Dakota
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12/23/2006
03:16:42
| RE: Fan Clutch
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Message:
First I would replace the Thermostat with a 192 degree thermostat. If the fan is stuck so it won't shut off, it should just take longer for it to warm up. Does the fan still continue to roar after you exceed 20 mph? If it does, the fan may be stuck on constant engaged. That will also steal HP from you.
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Mikey
Dodge Dakota
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12/23/2006
22:27:51
| RE: Fan Clutch
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Message:
OBIO3
Yes ,it only throws out mildly warm air, sorry for the confusion. Should I be able to hear the air damn opening, cause if so , I can't hear anything. Would that mean that it is not opening all the way?
Red99DakR/T
How could I tell if it is stuck on constant engage?
Does the truck have to be moving or just the engine speed?
Cause now that you mention it my mileage stinks.
Could that be due to the fan always spining?
What would tell it to stop spining, is it engine RPM's or is there a temp switch somewhere?
Thanx guys.
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Red99DakR/T
Dodge Dakota
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12/24/2006
07:00:07
| RE: Fan Clutch
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Message:
Mikey, If the fan is engaged all the time you will hear the roar of the fan every time you start out. If it disengages, you will actually hear it disengage or the roar stop. With the engine hot, you should be able to spin the fan easily (with the engine off, of course). Also, in the old days, we would block air flow through the radiator using card board. I would double check your thermostat because a substatial difference in temp could be caused by having a 160 or 180 degree thermostat in, instead of a 192. I hope that helps....
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pacman
Dodge Dakota
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12/24/2006
11:32:36
|  RE: Fan Clutch
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Message:
Mickey,
I've been reading about your saga and am sorry you have no heat. I'm in Florida and it's shorts and tee shirt weather...sorry :) Forgive me if my reading comprehension is bad, but is your main problem the engine temp isn't warm enough or are you just freezing? I had a similar problem with my 2000 R/T last winter. I had what sounds like the same problem. I have the Orig. Mopar shop manual. When I put a stick thermometer at the passenger floor vent and compared the readings to the chart in the book, it didn't take an engineer to tell me the problem was no heat. I pulled the heater hose clamped to the top of the water pump and the return heater hose coming out of the heater core in the dash. Next, I made a "thing-a-ma-bob" out of pvc water fittings: 3/4" threaded hose-end fitting glued to a small piece of 3/4" water line. Then I glued a 3/4" to 1/2" reducer. After that, a 3" piece of 1/2" pvc water pipe. I slipped the "jig" into the hose at the water pump side and used a hose clamp to secure it in place. I hooked up a garden hose and put an old towel on the engine near the output side of the heater core at the firewall and turned on the water (slowly at first, then increased the pressure) Man, you wouldn't believe the junk that came out! It was a rusty clay-like substance that blew out like a spit-wad through a straw. I stuck the airconditioner test thermometer in the duct along with some towels and taped it in place. I started her up and let the engine get warm enough and was rejoicing when I watched the needle climb past 100 degrees and close to 120! If you need any reference info from the manual, feel free to contact me vai email at dodgert63@yahoo.com
Good Luck!
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Red99DakR/T
Dodge Dakota
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12/24/2006
13:38:17
| RE: Fan Clutch
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Message:
Pacman, I take it that you basically did a reverse flush through the heater core? I might add that as my yearly weatherization methodes.
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pacman
Dodge Dakota
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12/24/2006
16:47:59
| RE: Fan Clutch
IP: Logged
Message:
Yep, you're right. I'd recommend doing it. I'm planning to do one again since it's already been a year for me. Sure beats paying $400 plus for a heater core. By the way, didn't I see you post a message about coming off a long-cruise? Tell me about it. What ship/squadron?
Steve P.
dodgert63@yahoo.com
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OBIO3
Dodge Dakota
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12/24/2006
20:02:27
| RE: Fan Clutch
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Message:
MICKY........ From what you said, the thermostate is not working proper. It is either stuck open, installed up side down, if this is possible on your truck, or the wrong stat by which it is to small around or the edge of the stat is not properly constructed for your engine allowing it to pass water. One easy way to eleminate all other reasons is to completely cover your radiator....PAYING CONSTANT ATTENTION TO ENGINE TEMPERATURE.... Just sit in the truck and watch the guage and keep the heater set on high. If the temp guage goes up to normal and you got good heat just shut it down and change the thermostate.
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mj
Dodge Dakota
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1/01/2007
02:11:55
| RE: Fan Clutch
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Message:
Mikey,
"Is it unusual for my fan to not stop turning?"
The fan will always spin, sometimes at cold start up or hi temps,the fan will go into full lock-up mode untill temps drop. The fan will emit an obviuos roar sound. Usually when engine is cold or after hi temps have dropped, then fan will sort of freewheel less rpms than wwhat the engine is running. The roar will decrease or go away altogether.
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mj
Dodge Dakota
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1/01/2007
02:20:53
| RE: Fan Clutch
IP: Logged
Message:
Mikey.
If your heater core is plugged, you would be getting no heat output from the blower at all. (Providing the blend door is funtioning properly).Best way to diagnose your prob. is by using an infrared gun. That way you would be able to track the temps through-out your cooling system and be able to pin point the prob. Stuck open stat. would make the engine warm up slower, but then it would still get hot. Stuck closed stat would cause rapid overheat due to insufficiant curculation. Bottom line, get the infrared gun!
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