Truck running cold.
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Freshman User
Joined: Sep 2016
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Truck running cold.
I bought this truck recently and i noticed it seemed to run cool. The needle would be right at n. The pervious owner changed the coolant a couple months ago but put the wrong stuff in. So today i drained it and filled it with red cat coolant. Its now running really cool. This pictures as hot as it gets.
Kinda think it might be missing a thermostat or it stuck.
Anything else it could be?
Kinda think it might be missing a thermostat or it stuck.
Anything else it could be?
Postmaster
Joined: Dec 2011
Posts: 3,860
Likes: 7
It should run at the N under normal(unloaded) driving conditions; that's around 185-190F where the thermostat opens.
It's only once you start hauling a heavy load uphill for a ways that you start to hit some higher temps.
It's only once you start hauling a heavy load uphill for a ways that you start to hit some higher temps.
Senior User
Joined: Mar 2013
Posts: 203
Likes: 1
From: Agassiz, BC Canada
I would suggest double checking the temp through other means, a mechanical gauge or even temp gun before jumping to conclusions. The old factory gauges in these trucks leave a lot to be desired.
That being said, it's not uncommon for the thermostats to get stuck open resulting in a truck that will not come up to temperature under normal conditions. Most here will tell you to only use genuine ford replacement thermostats, I did and have had no issues yet.
That being said, it's not uncommon for the thermostats to get stuck open resulting in a truck that will not come up to temperature under normal conditions. Most here will tell you to only use genuine ford replacement thermostats, I did and have had no issues yet.
Senior User
Joined: Feb 2011
Posts: 336
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From: Roslyn, Wa.
Some thermostats run on the cool side, Usually the ones bought from the local parts store.
Get yourself a motorcraft T-stat and it will run like shorerider16 said, Just below the middle under normal driving conditions. These engines need heat to better burn the fuel so if it is actually running that cold, it's hard on the fuel economy and probably lacking in the power department too.
Get yourself a motorcraft T-stat and it will run like shorerider16 said, Just below the middle under normal driving conditions. These engines need heat to better burn the fuel so if it is actually running that cold, it's hard on the fuel economy and probably lacking in the power department too.
i ain't rite
Joined: Mar 2005
Posts: 65,507
Likes: 5,563
From: Marlboro Mental Hospital.
i have never paid any attention to the in dash temp gauge. if the heater blows hot and the temp idiot light does not come on, everything is good.
i have seen the gauge show below "N" but blow super hot in winter, and have also seen it hover around "L" and blow almost cold air out of the heater. this was when the truck was almost new. after that i realized that the gauge was useless and the only thing that really worked was the idiot light. it will come on around 230 degrees in my trucks..
i have seen the gauge show below "N" but blow super hot in winter, and have also seen it hover around "L" and blow almost cold air out of the heater. this was when the truck was almost new. after that i realized that the gauge was useless and the only thing that really worked was the idiot light. it will come on around 230 degrees in my trucks..
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