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Bad fan clutch and no overheat? #4707997
03/26/18 10:37 PM
03/26/18 10:37 PM
Joined: Nov 2009
Posts: 5,219
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP

Joined: Nov 2009
Posts: 5,219
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.

Re: Bad fan clutch and no overheat? [Re: motor_oil_madman] #4708009
03/26/18 10:45 PM
03/26/18 10:45 PM
Joined: Jun 2003
Posts: 18,414
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline

Joined: Jun 2003
Posts: 18,414
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 carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Bad fan clutch and no overheat? [Re: motor_oil_madman] #4708013
03/26/18 10:48 PM
03/26/18 10:48 PM
Joined: Jan 2017
Posts: 2,522
VW Fanboy Island
maxdustington Offline
maxdustington  Offline

Joined: Jan 2017
Posts: 2,522
VW Fanboy Island
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.


03 Jetta AWP/09A 205k kms
Edge 0W40 + Mann 719/30
Re: Bad fan clutch and no overheat? [Re: motor_oil_madman] #4708295
03/27/18 09:36 AM
03/27/18 09:36 AM
Joined: Dec 2015
Posts: 348
Ohio
Dorian Offline
Dorian  Offline

Joined: Dec 2015
Posts: 348
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.


15 Camry Hybrid SE 48K 0W20 Kendall bulk
14.5 Camry SE 2AR 0W20 M1 AFE 44K (Mom's)
98 Chevy Prizm 1ZZ M1 AFE 0W30 148K (Brother's)
Re: Bad fan clutch and no overheat? [Re: Dorian] #4708326
03/27/18 10:05 AM
03/27/18 10:05 AM
Joined: Feb 2013
Posts: 11,342
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline

Joined: Feb 2013
Posts: 11,342
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 92k STP Synthetic HM 10w30 & Wix
2000 Toyota Camry 2.2L 233k Mobil Super HM 10w40 & Fram Ultra
1996 Jeep Cherokee 4.0L 148k Mobil 1 HM 10w40 & Fram Ultra
Re: Bad fan clutch and no overheat? [Re: motor_oil_madman] #4708498
03/27/18 01:13 PM
03/27/18 01:13 PM
Joined: Dec 2015
Posts: 348
Ohio
Dorian Offline
Dorian  Offline

Joined: Dec 2015
Posts: 348
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.


15 Camry Hybrid SE 48K 0W20 Kendall bulk
14.5 Camry SE 2AR 0W20 M1 AFE 44K (Mom's)
98 Chevy Prizm 1ZZ M1 AFE 0W30 148K (Brother's)
Re: Bad fan clutch and no overheat? [Re: Chris142] #4708598
03/27/18 03:38 PM
03/27/18 03:38 PM
Joined: Sep 2015
Posts: 1,691
USA
mk378 Online content
mk378  Online Content

Joined: Sep 2015
Posts: 1,691
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.

Re: Bad fan clutch and no overheat? [Re: motor_oil_madman] #4709137
03/28/18 03:10 AM
03/28/18 03:10 AM
Joined: Aug 2006
Posts: 9,989
Central Washington
Colt45ws Offline
Colt45ws  Offline

Joined: Aug 2006
Posts: 9,989
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.

Last 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 86k
Pennzoil Conv HM 5W30, Fram XG2
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