2008 doesnt stay warm - Ford Powerstroke Diesel Forum
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Old 11-07-2013, 01:47 PM
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2008 doesnt stay warm

2008 with a spartan tuner, lower hp setting, dpf, egr delete. The engine temp gauge never goes past 1/4. On a warm day it'll go near halfway while driving, but then when you idle, it will drop back down. Can this be a stuck open thermostat? Now that the colder months are here, it struggles to get warm. other than that, it drives absolutely perfect.
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Old 11-07-2013, 03:40 PM
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Sounds like a stuck thermostat, can you monitor actual ECT via the obd2 port to verify it's not just a bad sending unit to the gage


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Old 11-11-2013, 09:59 AM
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similar problem

Mine ('08 w/spartan) comes up to temp fine however the heater goes "in and out". As in, fan blows warm then cold air back and forth while driving. Had new rad, water pump annd fan assy put in last summer. fluids topped off. however this problem has existed for a couple winters. i live with it, but wifey driving it now so.....i don't to give her an excuse to be any more cold than normal...LOL!!!

has pushed coolant in the past.
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Old 11-11-2013, 10:20 AM
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Quote:
Originally Posted by underpressure910 View Post
Mine ('08 w/spartan) comes up to temp fine however the heater goes "in and out". As in, fan blows warm then cold air back and forth while driving. Had new rad, water pump annd fan assy put in last summer. fluids topped off. however this problem has existed for a couple winters. i live with it, but wifey driving it now so.....i don't to give her an excuse to be any more cold than normal...LOL!!!

has pushed coolant in the past.
Yikes! Time for studs and head gaskets


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Old 11-11-2013, 10:37 AM
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underpressure910: Sounds more like air in the coolant system to me. Maybe it's that cavitation thing I have heard of, but never saw, but I would drain and refill the coolant. Check your oil to make certain it's good.

jasong145: Stuck thermostat, or faulty sensor.
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