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Old 12-13-2015, 09:03 AM   #1 (permalink)
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Default alto (2005) heater blowing luke warm

Hi folks

The heater on my 2005 alto only blows luke warm. I've replaced the engine thermostat ( although the old one tested OK when I took it out). Both pipes going through the firewall seem to be the same temperature. The white plastic actuator on the RHS by the clutch pedal is moving OK.

Does the Alto have a heater control valve please and where is it located. I would like to check the temperature of the heater matrix but I can't figure out how to get in. Are there any instructions anywhere on how to get to the matrix?

Any clues as to the probable cause of the problem would be much appreciated.

thanks
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Old 12-29-2015, 03:23 PM   #2 (permalink)
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OK so the actuator is functioning and both pipes to the matrix are warm, what we don't know is if the water is circulating through the matrix. It could be an airlock in the matrix stopping the flow.
Have you drained the system and then refilled, if you have it could well be an airlock in the matrix.
Best course of action would be to raise the front of the car so the filler cap is higher than all of the hoses and run the engine with the radiator cap removed and squeeze the radiator hoses to see if that forces any air out of the system.

Hope that helps
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