Question about Toyota Pickup
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
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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Posted on Jan 02, 2017
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