Engine overheating

Discussion in 'Mazda Truck Forum' started by sigmrelics, May 2, 2018.

  1. sigmrelics

    sigmrelics New Member

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    Have a 19994 Mazda B3000 pickup. I add about a quart of water every day to the reserve plastic tank, but after driving for about 10 minutes, it sounds like the radiator is boiling. The instrument gauge shows hot. Removing the cap on the reserve tank and the bubbling sound is coming from there. After cooling down and taking off the radiator cap, it is full, but the reserve tank is empty. What is going on?
     
  2. dirtrider73068

    dirtrider73068 Senior Moderator
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    Could be the thermostat is trying to stick shut, can remove it, put it on a pan of water on the stove using a tempture probe in the water start heating the water up to the temp the tstat is suppose to open say like 190 then using something to pull it out of the water see if its open fully or not, will know if its bad. Or could be the water pump is getting weak not pumping enough through the cooling system, make ure the fan is running good and pulling good air, or even washing the rad off, just make sure to hose it down from fan side to push out the junk not force it further inside, or just remove the rad altogether and go the car wash and blast it out.

    The reason the reserve tank goes low is when it starts to cool off it create a vacuum and sucks it back out of the reserve tank to keep the system full. And you need a mixture of coolant and water, straight water will boil off and you start to loose it to steam, coolant mixed with water keeps them from happening and also helps cool it down.
     
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  3. gmctrucks

    gmctrucks Full Member

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    It should have a fan clutch check it out that it’s working correct and while your messing with it buy a new radiator cap and dirtrider wrote down a lot of good info.
     
  4. leolkfrm

    leolkfrm Full Member

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    sounds like a head gasket
     

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