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Coolant Gauge Breakdown  RSS feed
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mikey1273

Joined: 18/09/2010 01:03:51
Messages: 6
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Mine has been for the last week running at the mark just above the first quarter before the middle so its cooler than 167. takes longer to warm up too and I'm not getting as much heat as I think I did last winter. Thermostat shot?
GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 353
Location: Southeast Michigan
Mikey1273,

With the GDE tunes the engine tends to run slightly cooler as less fuel is required to achieve the necessary torque while driving or idling. On our vehicles the coolant temps tend to run around 170-180 F, right around thermostat start of opening with a bias towards 170 F during winter months. You can remove the according snorkel on the front of the air box to allow warmer engine compartment air to get pulled through the air filter. As it gets even colder, we will most likely remove the mechanical fan for the winter or just block a portion of the radiator from the fresh air stream.

Also, keep in mind we lowered the threshold to turn off the viscous heater while the engine is warming up. Oringinally the VH would remain on until the coolant temps went above 161 F and would turn back on if the temps dipped below 150 F. With the tune, the VH will turn off during warmup when coolant reaches 131 F and turn back on when temps dip below 122 F.
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47wop

Joined: 19/05/2017 21:06:07
Messages: 1
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My 2005 CRD with approximately 225,000 has been running 20-30 deg warmer than in the past. Lately the temperature gauge climbs quickly to 170-190 deg. The temp of upper and lower radiator hoses are about 170 deg while the thermostat housing is around 190-200. It has either been boiling off coolant or leaking somewhere since level in reservoir gets low. The thermostat has never been changed.


Seems like restriction possible in thermostat. The egr valve was replaced in spring when weather was cooler. Electric fan is coming on , not sure how mechanical fan is working. It was replaced about 20,000 ago.

Thermostats are pricey and water pumps are time consuming to get to.

Looking for suggestions for cause of temp increase and any cause for concern.

Thanks.

GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 353
Location: Southeast Michigan
If you are not see temps higher than 220 F, then the t-stat is still working. Most t-stats fail open and lead to cold running in winter months.
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