Question about Toyota Pickup

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1994 toyota truck v6 3.0 liter, automatic trans. 147k miles now. Head gasket recall at 136k, toyota dealership replaced short block about 1 year ago. Truck sat for about a year after being fixed by toyota. green coolant was mixed with red coolant just before sitting for a year. This engine runs great and shows no cooling problems while driving even with the ac on and 90F days. This is the issue: after driving the truck and turning the key off and waiting 5 minutes or so, Then turn the key on without starting the engine, the temp gauge heads toward the red. It will get to about 3/4 of max, but does not get to the red. If the engine is started at this point, the temp gauge will come back down to normal temp. I have replaced the thermostat and fan clutch, but it made no difference. I have searched the internet and I have talked to several mechanics. I keep getting 2 different answers from all sources. 1. this is normal -- the metal is hot when turned off and the heat dissipates thru the coolant and the temp of the coolant is what the temp gauge is showing. 2. It only takes one time of overheating to ruin an engine and with the head gasket history of this engine, it still has a problem. Please Help, I'm really afraid to drive the truck until I'm sure it doesn't have a cooling problem.

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  • russell_e_ra Jul 21, 2009

    Why doesn't my 93 celica, or 99 tacoma exhibit the same type of behavior? I haven't seen this in any vehicle that I have driven and I have driven many. Have you personally seen this behavior and what kind of vehicle was it?

  • russell_e_ra Jul 21, 2009

    I don't mean to beat a dead horse, but you still haven't answered my question:::::





    Have you personally experienced this behavior and in what type vehicle (details please)?





    also*** what temperature will cause engine damage(head gasket) etc?



    Thanks

    Russell

  • russell_e_ra Jul 25, 2009

    plese see original question and info

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This issue was addressed many years ago and is a common occurrence with not just your truck but many other vehicles as well. The way the auto manufacturers attempted to solve this was to allow the electric fan to continue to run after the vehicle was shut off thereby cooling the engine coolant in the radiator and consequently reducing engine temp, the fact that your truck does not have a electric fan makes this condition of the temperature spike after shut off a normal condition that happens to every vehicle that doesn't possess this electric fan feature, especially aluminum engines, what happens is the coolant no longer circulates in the engine after the vehicle is shut off thereby temporarily increasing the coolant temperature, with the advent of aluminum engine blocks and heads the coolant and metal for that matter not only cool down faster (heat dissipation properties of the metal) but also reach operating temps faster so you see the spike you see in temp after shutting off the engine is fairly common. The only action you can take is to ensure that the radiator is flushed periodically, the radiator's cooling fins are not obstructed by leaves or any type of debris and that the coolant is a 50% water 50% antifreeze concentration and all air is bled out of cooling system. Other things that cause engines to operate hot during use are lean air/fuel mixture (caused by vacuum leaks or bad O2 sensor Primary bank), and improperly set timing and since you have already taken the necessary other precautions, (changing the fan clutch and changing thermostat) just ensure that the cooling system is flushed and clean there are no trouble codes stored that would indicate the aforementioned reasons for high temperature operation condition and your truck will be safe to operate.

Posted on Jul 25, 2009

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It is normal for the gauge to do this,also if it doesn't ever get to the red mark,it is not over heating,the normal temp range is anywhere below the red.

Posted on Jul 21, 2009

  • Randy Hough
    Randy Hough Jul 21, 2009

    Many vehicles do it when you turn the key without starting the engine,and as soon as you start the engine the guage returns to the actual temp of the engine,Just like when you turn the key to on but don't start the car,the check engine light comes on as well as many other lights,but as soon as you start the car they go off,This is just a normal thing in some vehicles (not all) also the head gasket could be bad or going bad again and a few simple test could determine if that is the case,But if the gauge never gets to the red, it's NOT overheating.The red mark starts at 200 degrees, Normal operating temp is 175 degrees or lower, 212 degrees is overheating.



    The thermostat doesn't even open until the temp reaches 175 degrees. So don't panic or worry unless the gauge get to the red mark.

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Norrmally if an engine goes more than half and does not cool down after that then you have a risk of causing serious damage.To be on the safe side, observe if the fan starts as soon as engine temp reaches half,if not then your thermostat is faulty or your temperature gauge is faulty.Be careful with this as it may cause serious damage.

Posted on Jul 21, 2009

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