Question about 1997 Toyota Tacoma

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No heat I flushed the radiator and replaced the thermostat. The engine is not overheating but can not get hot air. Can trapped air in system cause this?

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Yes it can.

Posted on Jan 21, 2009


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Hi there I'm looking for some advice I have a Nissan pulsar 2000 no heat from the heater and car keeps overheating while driving I be flushed the radiator and heater core, replaced the thermostat


Crazy but have you put thermostat back in correct way? If so sounds like an air blockage. Fill radiator, leave cap off, put internal heater on hot and run engine until water is fully hot. Both top and bottom radiator hoses are hot. Sometimes therenis a bleed screw near the engine compartment bulkhead that needs opening to let trapped air out. If you have drained and refilled system and it only happened after that guarantee air lock. Good lick, let me know how you went plead.

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You may have air trapped in the cooling system. This will cause overheating. When you fill the system, there is a small brass air purge valve above the coolant pump and another on the thermostat housing. These need to be loosened and trapped air released when filling the cooling system.

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Don't remove radiator cap when engine is hot.

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you may need to replace the thermostat or the water pump to solve the overheating issue.
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The radiator drain petcock is on the bottom of the radiator near one of the corner edges.
(Some face engine, others face the grille)
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once you flush/fill the system, use a 50/50 mix of water and the proper antifreeze. (older cars use green, newer use orange)

If you are unsure, just ask the guys at the auto parts place which one you need and note that they sell an orange color that can be safely used in old and new cars and it can also be mixed with any color of fluid.

After you have the system filled, start the engine and remove the fill cap.... let it run and watch for air to rise out from the opening. (Some coolant/water may overflow, but you need to watch for any air bubbles coming out)

Once you don't see any air trying to escape, put the cap on tight and you should be good to go,

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If car heats up quickly and overheats , the problem is the thermostat. The thermostat stays closed and traps coolant in the engine untill it reaches about 185 degrees , than the thermostat opens and allows coolant to flow to the radiator where it is cooled by airflow. ( airflow while driving is usually sufficient ) while idling , or in slow trafic , the fan keeps air moving through the rad. The heater core is strictly for heat in the winter inside the car. The thermostat is the most likely cause of the problem , and even if it was good before , the overheat / boil situation likely cooked it anyways. I am assuming the water pump is still getting turned by a belt. No water circulation by pump would cause same symptom as bad thermostat. Overflow and expansion bottles are designed several different ways on different cars , but the theory is that as the engine heats up and the coolant expands , it goes to the tank. Later , as engine cools down after being shut off , coolant contracts. Radiator is replenished by coolant returning from expansion bottle.

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Water pumps can stall out, but do you have air trapped in system.
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Check your trans fluid color. Since the trans cooler is built into radiator (automatics)

IF the engine is overheating the trans CAN overheat
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