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| Author: | TennesseeCRD [ Sun Mar 06, 2011 5:18 pm ] |
| Post subject: | viscous heater |
Can anyone point me to a thread or tell me the procedure to disconect the viscous heater. My thermostat isn't working and I fear that the viscous either isn't working or its working all the time and not providing any substance. Anyway, I'd like to disconnect it so It isn't pulling down rpm's or mileage. The thermostat is the next on my list to get fixed, that is if I can find one. Thanks |
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| Author: | Joe Romas [ Sun Mar 06, 2011 6:25 pm ] |
| Post subject: | Re: viscous heater |
I believe there's a relay for that in the fuse box by the battery but I'm not 100% |
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| Author: | DOC4444 [ Sun Mar 06, 2011 9:55 pm ] |
| Post subject: | Re: viscous heater |
Joe's right, just pull the VH relay from the fuse box and you will pick up at least 2-3 MPG. There is no problem with this and nobody has reported any long-term issues with it. BTW, GDE can reset the shutoff point for the VH. Even with a "failing" thermostat that results in only 160 degree F coolant temp at the moment, our VH shuts off in 5-10 minutes after starting from dead cold. DOC |
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| Author: | ATXKJ [ Sun Mar 06, 2011 9:58 pm ] |
| Post subject: | Re: viscous heater |
I ordered a replacement thermostat from Mopar Parts America - it's not Kap's 190F but a 170F stock gets better mileage and runs better than a worn 130F thermostat. |
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| Author: | TennesseeCRD [ Sun Mar 06, 2011 10:39 pm ] |
| Post subject: | Re: viscous heater |
Thanks, I'll pull the relay. I'll replace the thermostat and do the GDE ecotune not necessarily in that order. |
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| Author: | TennesseeCRD [ Mon Mar 07, 2011 9:52 am ] |
| Post subject: | Re: viscous heater |
I pulled the relay this morning then started the crd. Immediately I noticed a smooth idle that I haven't had before. It used to fluxuate and it had the sounds of an ac unit cutting on and off every few seconds. Thanks guys. |
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| Author: | quebeccrd [ Mon Mar 07, 2011 10:38 am ] |
| Post subject: | Re: viscous heater |
Does the GDE eco tune turn off the viscous heater? my thermostat begin to fail (it is between 1 or 2 ticks from the middle), and i was wondering if it would be a good idea to pull the relay too, but i already got he eco tune. Thanks |
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| Author: | yakers [ Mon Mar 07, 2011 1:20 pm ] |
| Post subject: | Re: viscous heater |
Not unless you have specifically requested that 'adjustment', the tune may shorten the warm up period, not sure about that. I expect GDE will clarify. But being so far north I would never disable the viscous heater unless you have something like those supplemental propane heaters air cooled cars had. |
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| Author: | papaindigo [ Mon Mar 07, 2011 1:46 pm ] |
| Post subject: | Re: viscous heater |
viewtopic.php?f=5&t=52364&hilit=viscous+heater Includes comment by GDE to the effect that the viscous heater can be left off without causing any problems. |
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| Author: | GreenDieselEngineering [ Mon Mar 07, 2011 1:52 pm ] |
| Post subject: | Re: viscous heater |
quebeccrd wrote: Does the GDE eco tune turn off the viscous heater? my thermostat begin to fail (it is between 1 or 2 ticks from the middle), and i was wondering if it would be a good idea to pull the relay too, but i already got he eco tune. Thanks We do not turn off the VH, just lower the coolant threshold where it will shut off on its own. With a GDE tune the VH shuts off if the coolant is greater than 131 F. A slightly failed open thermostat will have stable coolant temps around 150-170 F, so the VH would still be off with our tunes. Fixing your t-stat will help acheive the most fuel efficiency from the engine. |
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| Author: | mustang_gt_350 [ Wed Mar 16, 2011 3:10 pm ] |
| Post subject: | Re: viscous heater |
I would be worried about turning it off completely. The colder the engine runs the more wear it see's internally. Mostly Bore wear. Now turning it off early most likely won't hurt anything since once that warm it usually doesn't take long to reach operating temp. however i would be worried about the lower on/off temp in the winter, as i have noticed if i'm running my heater on a higher setting when its cold (15F or less) the Viscous is running all of the time. |
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| Author: | danoid [ Thu Mar 17, 2011 8:33 pm ] |
| Post subject: | Re: viscous heater |
I don't believe the viscous heater has anything to do with engine wear, or passenger comfort. Someone from outside of the US correct me, but non US CRD's don't have a viscous heater right? Therefore the only reason the viscous heater probably was installed in the first place is an FMVSS (Federal Motor Vehicle Safety Standard) that requires the vehicle be able to clear a frosted windshield (under certain test conditions). The only way to do that is to have warm coolant, which is all the viscous heater does. It's only a side effect that the cabin heat comes on a little faster. I disable mine when the temperature is about 10°F or below, just 'cause I like heat faster then. Otherwise, I like better fuel economy. |
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| Author: | striperman36 [ Fri Mar 18, 2011 11:49 am ] |
| Post subject: | Re: viscous heater |
just pull the relay like doc stated it is 2-3 mpg increase. |
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| Author: | striperman36 [ Fri Mar 18, 2011 12:49 pm ] |
| Post subject: | Re: viscous heater |
just pull the relay like doc stated it is 2-3 mpg increase. |
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