94 Pickup Temp Reading

Discussion in 'Toyota Truck Forum' started by smitty316, Jan 17, 2016.

  1. smitty316

    smitty316 Full Member

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    I replaced the radiator and thermostat in my 94 Toyota Pickup last year. Then I noticed that the temp gauge went almost to hot after warming up, but then it went back to normal. I have a feeling that it got over heated at some point because I had to replace the head gasket because I had oil in my radiator, but I don't know this for sure. I replaced the thermostat again when doing the head gasket in case I had a bad one. Since all of that I notice that the gauge still goes over half way, almost 3/4 of the way to hot before it goes back down to normal. Then it stays normal. Is it getting too hot? Is there anything else that can be causing this besides a thermostat?

    Thanks, Smitty
     
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  2. Kennyray

    Kennyray Moderator
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    I think you have an air bubble in the sytem. Put it on some ramps with the radiator cap off and the heat on full. That should burp it.
     
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  3. 96silverado

    96silverado Full Member

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    As Kennyray said..or even heater core clogged up with debris..
     
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  4. Bad88

    Bad88 Full Member

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    It could be a faulty temp sender or even a failing gauge. I also agree that an air pocket could cause it to do what you are describing. Flushing the cooling system is not a bad recommendation. You could also pressurize the system and check for any leaks / leak down to verify the head gasket, block, or head are A-OK.
     
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  5. smitty316

    smitty316 Full Member

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    Thanks guys, I have a good mechanic and he said he checked the head and believed it was okay. I have to trust him. An air bubble sounds like the most likely thing.
     
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  6. leolkfrm

    leolkfrm Full Member

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    might need a new sensor, my beater goes 3/4 of the way, t-stat opens and runs fine...might be the norm for out of spec sensor
     
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  7. chevychase

    chevychase Semi-Admin
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    Plenty of antifreeze? If not might get slush..engine warms slush melts..temp down. What temp thermostat?
     
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  8. smitty316

    smitty316 Full Member

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    It has fresh antifreeze and I used a 195 degree thermostat. I think that was recommended.

    Thanks, Smitty
     
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  9. gmctrucks

    gmctrucks Full Member

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    I agree it might be what was written above I would instal a mechanical water gauge and also check the water hoses to make sure there not being sucked in or collapsing restricting the water flow well here is what my pea brain thinks it might be.
    Good luck! GMC
     
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  10. MrMarty51

    MrMarty51 Full Member

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    I do not know what type of cooling fan that these toyotas have but.
    My 93 K1500 GMC, with the clutch fan, it used to go to 200 then, seemed like the T~Stat would open and, it would cool tight down, after two new T~Stats over the years, the fan on the clutch seemed that it had began to get some slack in the clutch, pushing back then forwards on the fan blades, I replaced that clutch and have not had that issue since.
    Something You might look at.
    If the pickup has an electric fan system then, take a look at the heat sensor that turns on the fan/s.
     
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