Question about 1993 Toyota Paseo

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From warm to cool

I get the temp to warm and then it goes below cold and have any heat either.it stays at this temp.i don't know if the engine gets hot but i can take the radiaor cap off ,its cold and the the car been running for a hour!

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Youi have a thermostat that is stuck in the open position; you are going to need to replace the thermostat.

Posted on Dec 29, 2008

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My 2000 jimmy has heat problems. the heat goes from cold to hot to warm to cold etc. what could the problem be?


If the temp gauge is now more stable, the problem is in your heater system, not the engine cooling system.

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Not sure I follow your wording on the different temps. If the system is full of coolant and working correctly, the thermostat should open at 195 degrees which would be several miles down the road. Once the thermostat opens both radiator hoses should be warm. If the water pump is not working the engine will get hot very quickly.
Have you tried running without the thermostat to see what happens ?

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My mazda protege is having a heating problem. The temp guage will go up to the normal place as the engine warms up but then when I drive down the road the temp guage goes down to below cold and then my car...


I believe the mazda protege has a separate thermoswitch to activate the radiator's fan. Perhaps the fan keeps blowing until the temperature is too low. Try replacing the fan thermoswitch. Just take care to put in tis place a thermoswitch of the same temperature range.

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My temperature guage stays in the middle, is this ok?


Yes, the temperature gauge should normally stop in the middle, between the cold and hot points on the gauge. When the engine is cold the thermostat will be closed and will keep recirculating the coolant in the engine block until it warms up sufficiently. Then the temperature of the warm coolant will cause the thermostat to open the channel to the radiator to get rid of excess heat, which should stop the coolant from over heating. So the effect of the thermostat keeps the coolant at a fairly stable temperature. When the coolant runs low, it can't transfer enough heat to the radiator and the coolant and engine then over heats. Watch for radiator leaks under your car after you have been driving it. If the coolant goes low again fairly quickly you could have a leak in a hose or the radiator itself.

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Heat goes in and out and the temp gauge goes up and down


Your temp sensor has nothing to do with your heater. The temp sensor needs coolant in order to work properly. So first check the coolant level because if it is low your heater will act the way you describe. Once the coolant gets low enough the heater will blow cold. Another possibility is the radiator cap. After the engine has warmed up it expands when it cools down it contracts. As it is contracting if the cap is weak air can be drawn into the system and cause air pockets to form and will cause the same problem

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Air pockets in radiator


Air can be purged. While your engine is cool remove radiator and reservoir caps. Place funnel in radiator. Turn heat to the highest position and start vehicle. Add coolant to radiator as needed while vehicle warms up. You should see bubbles coming out of radiator. Fill reservoir to between cold and hot fill lines. Replace caps when bubbling stops but before coolant temperature reaches normal operating temperature. Never remove the radiator cap until engine has fully cooled down.

Jan 15, 2013 | 2008 Nissan Frontier

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Am sure you have a thermostat stuck open, i suggest replace it and make sure the aantifreeze is in the correct level.

Dec 09, 2011 | 2000 Ford Focus

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Check engine light comes on when outside temp is


Take it buy Auto Zone when the light is on and get them to check the code for you. I don't know why it would do it while cold and not hot.

Mar 15, 2010 | 2005 Toyota Corolla

1 Answer

When my car warms up the heater blows out warm but gradually gets cooler and cooler after about 10 min. It will stay cold ( about three degrees above outside temp.) It does this on cold days. And after you...


It may be the valve that controls the amount of water entering heating core but I'm wondering if your engine thermostat isn't stuck open. This is what controls the coolant temperature in your engine. It closes off while engine is off. It will remain closed after you start your car until the water warms to a certain temperature then it starts to open enough to keep your car at the proper operating temperature. If it stick open then it will take a lot longer for the engine to heat up and on smaller cars might never heat up enough for your heater. If you live in very cold climates such as where I live in Wyoming, we have to change to a higher degree thermostat so we have a good heater when it's 30 below zero.

Be very cautious here but one way you can check this is to put a piece of cardboard in front of your radiator and stop the airflow that cools your engine coolant. THIS WILL CAUSE YOUR CAR TO HEAT UP AND CAN CAUSE ENGINE DAMAGE IF IT OVERHEATS. Don't completely cover the radiator but if your heater warms up when you put the cardboard in front of radiator it's a good sign that your thermostat is stuck open and needs to be replaced.

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1 Answer

Over heating


In general I know of no reason per se to replace the thermostat and temp sensor because you replaced the radiator fan. If the temp gauge seems to be staying in the 1/3-2/3 of full scale, and there is no apparent engine control issues as the engine warms from cold to operating temperature then there is no obvious reason to replace those items. Other than fan motor failure is there any reason for you to believe these other parts are at fault?You can get a free fault code readout at an Autozone parts store which would highlight a temp sensor problem, but there is no fault code for the thermostat except maybe the one for engine running cold for too long a time after start up. You could also check the resistance of the temp sensor which should run around 10-14,000 ohms when cold and drop to 700-1,000 ohms when warmed up.
I don't know about the issue of replacing the thermostat because I don't know which engine you are working with. So let me know an

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