No tempature issue
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4th Gear
Joined: Feb 2025
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No tempature issue
Hey everyone , I have a 1992 f150 with a 5.8l, couple weeks ago I changed the thermostat and it was working for a couple days then one day my temp gauge wouldn’t move at all and I had no heat in the truck, when I opened the rad cap after starting up the truck , the water pump was already moving water through out the radiator , I’m kinda lossed hoping someone can help me out on here, cause to me it sounds like a stuck therm
Last edited by Olbu3; Feb 13, 2025 at 10:33 AM.
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4th Gear
Joined: Feb 2025
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does the sending unit have and effect on temp for the heat in the truck, thought it was just wired into the gauge, also topped off on coolant
Fleet Mechanic
Joined: Nov 2022
Posts: 1,696
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The heater core is always flowing coolant, it could be low, or there's air trapped in it. Maybe your radiator cap isnt functioning properly, or the hose to the reservoir is blocked. Verify the blend door is working as well.
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4th Gear
Joined: Feb 2025
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No, it controls the gauge, which yours doesn't seem to work.
The heater core is always flowing coolant, it could be low, or there's air trapped in it. Maybe your radiator cap isnt functioning properly, or the hose to the reservoir is blocked. Verify the blend door is working as well.
The heater core is always flowing coolant, it could be low, or there's air trapped in it. Maybe your radiator cap isnt functioning properly, or the hose to the reservoir is blocked. Verify the blend door is working as well.
Hotshot
Joined: Jul 2020
Posts: 10,359
Likes: 2,594
From: Near Salt Lake City
Did you use a "fail safe" thermostat?
I have had bad luck with those Fail-Safe thermostats, doing exactly what yours has done
They get overheated once and then stick open
They overheat once during the initial warmup period even if the motor is absolutely full of coolant has been my experience
I will not install one of those Fail safe branded ones anymore
Fun stuff
I have had bad luck with those Fail-Safe thermostats, doing exactly what yours has done
They get overheated once and then stick open
They overheat once during the initial warmup period even if the motor is absolutely full of coolant has been my experience
I will not install one of those Fail safe branded ones anymore
Fun stuff
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Hotshot
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4th Gear
Joined: Feb 2025
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Likes: 0
Did you use a "fail safe" thermostat?
I have had bad luck with those Fail-Safe thermostats, doing exactly what yours has done
They get overheated once and then stick open
They overheat once during the initial warmup period even if the motor is absolutely full of coolant has been my experience
I will not install one of those Fail safe branded ones anymore
Fun stuff
I have had bad luck with those Fail-Safe thermostats, doing exactly what yours has done
They get overheated once and then stick open
They overheat once during the initial warmup period even if the motor is absolutely full of coolant has been my experience
I will not install one of those Fail safe branded ones anymore
Fun stuff
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RandyPDX
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