Temp Guage
Freshman User
Joined: Apr 2002
Posts: 44
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Temp Guage
I recently replaced my temp sending unit on my 77 400. Now my temp guage works, but often I notice the needle goes way over "H" for a brief moment 5-10 seconds, then returns to normal (abour 5/6 of full scale deflection; close to the hot end). I also just replaced my thermostat.
My question is
Does anybody else notice this? Could this be something bad, or is the meter just out of wack?
I'm beginning to think that my meter is just out of adjustment. But I never knew how well it worked before, because I bought the truck with a burnt sending unit.
Brad
My question is
Does anybody else notice this? Could this be something bad, or is the meter just out of wack?
I'm beginning to think that my meter is just out of adjustment. But I never knew how well it worked before, because I bought the truck with a burnt sending unit.
Brad 
New User
Joined: Jan 2008
Posts: 0
Likes: 24
Temp Guage
There are two different sending units available .
One for Gauges and One for idiot lights.
Which one do you have ?
[b][i][font color=red]Dennis[/font][i][b]
[font color=red]Calgary,Alberta,Canada[/font]
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[font color=green]Do You Need To Decode Your 78 Truck Data Plate?
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Then Buy Them HERE,At Motorhaven![/font]
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Please Don't Ask Me Any Tough Questions,
"I'm Saving My Memory For When I Develop Alzheimer's" [/font]
[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
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One for Gauges and One for idiot lights.
Which one do you have ?
[b][i][font color=red]Dennis[/font][i][b]
[font color=red]Calgary,Alberta,Canada[/font]
http://www.clubfte.com/users/mil1ion/Minimorleytruck.JPG
[font color=green]Do You Need To Decode Your 78 Truck Data Plate?
[/font
http://www.clubfte.com/users/mil1ion/FordTruckCodes.html
[font color=red]If New Ford Parts Is What You're Cravin',
Then Buy Them HERE,At Motorhaven![/font]
[font color=green]Please Feel Free To Visit My Website.[/font]
http://www.clubfte.com/users/mil1ion/Mil1ion.html
[font color=red]
Please Don't Ask Me Any Tough Questions,
"I'm Saving My Memory For When I Develop Alzheimer's" [/font]
[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
641/2-Mustang 260,Pre-World's Fair Car.
64-Fairlane500 S/C waiting for a 390-4spd.
68-Mustang 289-Sunlit Gold 80,892Mi
78-Buick LeSabre 403 4V [/font]
Moderator
Joined: Jan 2001
Posts: 56,992
Likes: 2,741
From: Virginia
Temp Guage
If it does this when you just start out in the morning, your thermostat may be causing this. Usually in the morning the thermostat will let the truck warm up and then when it opens, cold water from the radiator will rush in and then make it close. It will do this a couple of times before it settles down. But it shouldn't peg the needle while doing this, so maybe the thermostat is sticking a little.
If the above is not the case, and the guage pegs randomly even after it is warmed up, I would say you have a loose connection or damaged wire going to the sending unit. Follow it along the harness to make sure it's not damaged.
If the above is not the case, and the guage pegs randomly even after it is warmed up, I would say you have a loose connection or damaged wire going to the sending unit. Follow it along the harness to make sure it's not damaged.
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