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Heater not warming up and also engine temparature not reaching normal after a journey of approx 10 miles

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  • lilporche Nov 09, 2008

    need to know where is the temperture sencor is located

  • dodocoolio Nov 12, 2008

    i changed the thermostat, yet my daewoo is still not letting any heat in the car.

  • pwillan Nov 24, 2008

    heater not heating up

  • rick338 May 11, 2009

    My 02 civic takes a long time to reach normal operating temp. Thermostat has been replaced and head casket leak repaired, still will not warm up until 10 klm or more.

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Mikey is correct but there are other things that could cause this issue.

  1. Coolant could be low.
  2. Heater core could be clogged.
  3. Heater control door could be malfunctioning
  4. Head gasket could be wrong preventing coolant from circulating properly (This is rare but I have seen it happen)
  5. Heater fan failure
  6. Air bubble in cooling system.
  7. Bad Heater control valve or electronic control mechanism

General Trouble shooting guide:
  • Check the Coolant Level
  • Open and close heater control door and make sure it free of obstructions, like pencils falling through the vent ect.
  • Feel supply and return lines for the heater core one side should be slightly hotter then the other but both sides should be hot. If not you could have a stuck in line hose control valve on vehicle equipped with this mechanism. Or you could have a clogged heater core.
  • You should be able to hear and feel air coming out if the vents. if not yo may have a blower motor failure, or a bad fuse.
  • Air bubbles can be tricky but I have found that most times you can disconnect the heater core hoses and by forcing water into the heater core many times this breaks the loop of compressed air in the system and allows the air bubble to pass through the system to the radiator and burp out.
I hope this helps Some one. :D

~FN~

Posted on Jan 30, 2010

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Either the thermostat in the engine is stuck open or heater control valve is bad.
I would try option 1 and replace the engine thermostat first.

Posted on Oct 31, 2008

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1 Answer

Heaters slow at warming up


In normal circumstances the heater wouldn't begin blowing warm air until the vehicle has travelled 5 miles - call it 5 minutes. That's because the thermostat only begins to open at around that mileage/time and allows coolant to circulate around the engine. Before that - there just isn't any warm coolant in the heater matrix.

After 10 miles/10 minutes of normal driving the engine will be at its correct operating temperature and the coolant will be hotter - as will the circulating coolant in the heater matrix. That's when the heater blows the hottest air.

If you're sure that the heater has lost efficiency it may be due to air being trapped in the heater matrix/coolant system, or a blockage caused by limescale/engine corrosion within the heater matrix itself.

To remove any trapped air, set the heater to maximum, remove the radiator cap/coolant bottle cap and let the engine tick over for 10 minutes.

If the heater matrix is blocked/partially blocked, drain the coolant system, refill with plain water, set the heater control to open .. and let the engine tick over for 10 minutes. Drain it again.

Refill again with plain water and add a can of 'radiator flush'. Follow the instructions on the can of 'radiator flush'.

Drain again and refill with coolant/water.

If the heater is still inefficient then the only option is to replace it - and that's not an easy job.

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