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Julie Simon Posted on Nov 22, 2008
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2001 mazda 626 heater/temp gauge?

When the car is not in motion the temp gauge will go to normal. When it is in motion it will drop down below cold. When it is not in motion, it will blow out warm air if the heater or defrost is on, however when in motion it will only blow cold air. This morning was the first time I had seen the gauge go to hot. I warmed up my car and could not get any hot air even while sitting still. The gauge was normal until I started driving and then it went up to hot instead of how it has been going down to cold. Got any suggestions?

  • Anonymous Mar 22, 2014

    not hot air

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  • Expert 324 Answers
  • Posted on Nov 26, 2008
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Joined: Nov 26, 2008
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Your head gaskets are bad.... This is a common plroblem wiht those symptoms.

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2001 mazda 626 2.5 v-6

no
blown head gaskets will boil very quickly
I would be checking the temp SENDER unit for the temp gauge as it may be faulty and making the gauge read wrong
run the fault codes to check for coolant SENSOR for a possible fault as well
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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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I have a 1996 Mazda 626, the check engine light came on and the car has been redlining the the temp gauge. I got the engine codes which are: p0117 and p0421. Does anyone know how to solve this problem?...

The cooling fan must run or the car must be running into the wind to keep from cooking the engine. Physically turn the fan to see if it turns freely (cold engine). The computer reads coolant temperature and trips the fan relay on when normal temperature is reached. You need to read the control voltage at the relay to determine the problem. Possible bad temp sensor.
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Tempature gauge still goes to h

, ckeck the upper hose to see if it is hot , than ckeck the bottom hose , is it cool , the temp sould be about the same .if it is super hot on top and cold at the bottom hose , the raditor may be blocked, and the coolant is not flowing. you can try to flush the radiator . look to see if there metal shaving in the coolant . if there is the radiator is breaking down. this happen to me , my car would over heat change radiator car is a,ok easy fix . radiator barn .com
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2001 Mazda 626 ran hot this morn in 10 degree weather

Have the water pump checked it might be going out or not working,also change the thermostat while having this done.
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2001 mitsubishi eclipe heater does not blow hot air, my gauge reads a little below normal temperature whats the problem??? I just changed my thermostat and radiator and coolant temp sensor. at time when i...

It could be very well your water pump from the sounds of it. When was the last time you had that check or replaced? That would be my next guess to the problem...what's your mileage on the car?
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