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#4707997 - 03/26/18 10:37 PM Bad fan clutch and no overheat?
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4709
Loc: Houston, Texas
I'm thinking my fan clutch finally went out. It's not cycling anymore with the a.c on. Right now I think it's only occasionally working. So how come the engine isn't overheating at idle? This is my dodge truck in my sig.
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4708009 - 03/26/18 10:45 PM Re: Bad fan clutch and no overheat? [Re: motor_oil_madman]
Chris142 Offline


Registered: 06/05/03
Posts: 16495
Loc: Deplorable in apple valley, ca
Diesels need rpm and work to make heat. They tend to run too cold if idling. I fix lots of trucks like yours. If the fan does not work with the ac on it will smoke the compressor.
_________________________
02 Wrangler super-s 10w30
87 F250 proline 15w40
04 Tahoe super-s 10w30
Z400 Lucas 10w30
KLR250 Maxima 10w40
Can am maveric edge 5w40
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#4708013 - 03/26/18 10:48 PM Re: Bad fan clutch and no overheat? [Re: motor_oil_madman]
maxdustington Offline


Registered: 01/21/17
Posts: 226
Loc: Toronna
My car had no working fans for a while when I started driving it in february and I did not notice until I got stuck in traffic during a highway trip in may. I really only noticed because I have a scanguage, although to be fair the overheat light did come on eventually. Temperatures are a little different between toronto and houston, but you would be surprised how much heat capacity engines have. Idling does not generate that much heat.
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03 Jetta AWP/09A 200k kms

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#4708295 - 03/27/18 09:36 AM Re: Bad fan clutch and no overheat? [Re: motor_oil_madman]
Dorian Offline


Registered: 12/07/15
Posts: 273
Loc: Ohio
Diesels have very high thermal efficiency. I'm sure that the engine is designed to stay cool under extreme loads, so an idling engine is probably nothing for the cooling system in that truck. Also, with 12 Qts. of oil it will take quite a bit of work to make that engine get to a temperature that requires a cooling fan. For what it is worth, I have never heard the cooling fans on the 14.5 Camry. It takes an awful lot for the cooling fans to come on in the 99 Camry and the Prizm.
_________________________
99 Camry 5S Castrol Edge 0W30 192K FU
14.5 Camry SE 2AR 0W20 M1 AFE 34K (Mom's)
98 Chevy Prizm 1ZZ M1 0W40 FS 144K M1-103 (Brother's)

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#4708326 - 03/27/18 10:05 AM Re: Bad fan clutch and no overheat? [Re: Dorian]
Nick1994 Offline


Registered: 02/19/13
Posts: 9804
Loc: Phoenix, AZ
Originally Posted By: Dorian
Diesels have very high thermal efficiency. I'm sure that the engine is designed to stay cool under extreme loads, so an idling engine is probably nothing for the cooling system in that truck. Also, with 12 Qts. of oil it will take quite a bit of work to make that engine get to a temperature that requires a cooling fan. For what it is worth, I have never heard the cooling fans on the 14.5 Camry. It takes an awful lot for the cooling fans to come on in the 99 Camry and the Prizm.
On your 99 Camry, maybe the thermostat is opening too early?

On my 2000, if I idle in a drive thru for more than a minute the fans will kick on for about 20 seconds.

I'm also in Arizona. But it does it when it's cool out too.
_________________________
2015 Hyundai Sonata 2.4L 76k PU 5w30 & OEM
2000 Toyota Camry 2.2L 227k M1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 145k M1 HM 10w40 & Fram Ultra

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#4708498 - 03/27/18 01:13 PM Re: Bad fan clutch and no overheat? [Re: motor_oil_madman]
Dorian Offline


Registered: 12/07/15
Posts: 273
Loc: Ohio
Nick, I will look into that. If I remember correctly it is the 180*F model. I just looked online, and it appears that the radiator fans turn on when the coolant temperature is above 199*F.
_________________________
99 Camry 5S Castrol Edge 0W30 192K FU
14.5 Camry SE 2AR 0W20 M1 AFE 34K (Mom's)
98 Chevy Prizm 1ZZ M1 0W40 FS 144K M1-103 (Brother's)

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#4708598 - 03/27/18 03:38 PM Re: Bad fan clutch and no overheat? [Re: Chris142]
mk378 Offline


Registered: 09/27/15
Posts: 1318
Loc: USA
Originally Posted By: Chris142
If the fan does not work with the ac on it will smoke the compressor.


This is important; quit using the A/C until it is fixed. The A/C needs a lot more air flow than what the radiator needs to keep the engine from overheating.

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#4709137 - 03/28/18 03:10 AM Re: Bad fan clutch and no overheat? [Re: motor_oil_madman]
Colt45ws Offline


Registered: 08/15/06
Posts: 9612
Loc: Central Washington
I know its a different engine but my friends 05 F150 I replaced a bad fan clutch. It never overheated on him (4.6 V8) but he complained about poor A/C performance while stopped and a 'funny smell' on one or two occasions during extended idling which I believe to have been the over pressure valve opening and dumping refrigerant. That opens at like 500+psi or something IIRC.


Edited by Colt45ws (03/28/18 03:11 AM)
_________________________
-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2

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