Thermostat issues
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Junior User
Joined: Nov 2005
Posts: 70
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From: Sandia Park, New Mexico
Thermostat issues
My father-n-law has a 91 f-350 w/ over 300k on it. I seem to be the mechanic on this truck. I have put in several thermostats in this thing. IIRC I put in an OEM t stat last time (year ago?) and now it’s not getting up to proper temp on a not so cold day. Is anyone experiencing problems keeping t-stats in?
Will a faulty t stat hurt gas mileage like a gas car?
Thanks
Plow/truck
Will a faulty t stat hurt gas mileage like a gas car?
Thanks
Plow/truck
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Junior User
Joined: Nov 2005
Posts: 70
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From: Sandia Park, New Mexico
Originally Posted by pnose
Factory temp guage is a piece of crap,if thats what your going by then you should replace it with an aftermarket guage and see where the temp is really sittin at.
I agree that the factory tempture gauge isn’t telling you what tempture it’s running at. However it will give indication to an irregular reading. IE; it it’s always been running in the middle for the last 15 years, and whenever there is a problem with the t-stat, it will show hot or cold.
The actual tempture is irrelevant at this point, isn’t it?
I’ve always checked the old ones that I’ve pulled out and they were bad, stuck open.
Thanks for checking.
Anyone else having problems w/ t-stats sticking open?
Thanks,
Plow/Truck
Elder User
Joined: Aug 2003
Posts: 692
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From: newfoundland canada
Actual temp is always relevant. Is your heater giving a good heat,imho thats a better indication than the guage regarding a stuck open t-stat.I havent had any probs with the oem t-stat but have heard of lots of guys having trouble with aftermarket ones as they have a by-pass built into them that we dont need.Fuel and performance will suffer,as you know there is no ignition except for compression and heat,it will run best at optimum operating temps.I have seen 2 oem guages reading the same when the 2 after market ones can be showing 50 degrees in the difference.Has the coolant been maintained,flushed,distilled water,sca additives,etc.Other than that i really cant explain so many failures on the t-stat.Good luck with it,if you discover whats doing it let us all know.
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Junior User
Joined: Nov 2005
Posts: 70
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From: Sandia Park, New Mexico
Pnose, no its not giving good heat either, and it wasn’t that cold out about mid 50’s probably. This seems to always happen.
I also doubt that it’s been maintained properly. Maybe just the antifreeze changed but that’s about it.
What should be done to correct this?
It never runs hot, so restrictions aren’t evident. Is there a good radiator flush I can use?
Not sure what the acronym SCA is.
Thanks,
Plow/Truck
I also doubt that it’s been maintained properly. Maybe just the antifreeze changed but that’s about it.
What should be done to correct this?
It never runs hot, so restrictions aren’t evident. Is there a good radiator flush I can use?
Not sure what the acronym SCA is.
Thanks,
Plow/Truck
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
I would do a fan test......if the clutch fan is staying engaged it will cool the coolant too far and the engine will not recover.
Diesel engine coolant temperature at the top of the radiator where hose attaches after high rpm or under load condition for 20 minutes should be (195-237*F) 91-114*C
Standard cautions when handling hot engine/coolant apply, nice time to have a temperature reading point and shoot tool.
Diesel engine coolant temperature at the top of the radiator where hose attaches after high rpm or under load condition for 20 minutes should be (195-237*F) 91-114*C
Standard cautions when handling hot engine/coolant apply, nice time to have a temperature reading point and shoot tool.
