Question about 2004 Suzuki Verona

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Heater only blows cold air

Heater fan only blows cold air, but the temperature guage still shows the heat rising. Does this automatically rule out the thermostat? If not, what else could the problem be?

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Yes,it rules it out. The valve leading the water into the heater core is not opening or the door that put the air past or through the heater core is closed. This is general information not specific to your particular model.

Posted on Dec 18, 2008

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Posted on Jan 02, 2017

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1 Answer

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Make sure that your radiator is filled to the proper level. If it isn't, the heater core may not be filled, so no heat can be extracted from it.

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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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Loosing antifreeze but no visible leaks and none in engine oil. Also heater blows cold. Could thermostat be causing it to blow it out of overflow tube?


Hello, you may be right on the money.

How to test the thermostat in most vehicles;

Make sure the heater is off, start the engine and let it run for 6 to 8 minutes, ( this will allow the
engine to reach, " normal operating temperature "), from the inside of the vehicle turn the heater
temperature on high and turn the fan speed on high.
1. Listen very closely for a click sound from the engine, ( most thermostats make a click when
they open )
2. Watch your temperature guage, it should begin to lower as the coolant starts to circulate.
3. Usually within a few minutes the radiator fan will kick.

What the thermostat does;

It seperates your coolant into two parts. The first part is in your engine, the second part is in your
radiator and the coolant reservior. When the coolant in the engine reaches the temperature rating
on the thermostat the thermostat opens to allow the two parts of coolant to change places. Now
the cooled coolant in the radiator and reservior flows into the engine while the heated coolant flows
from the engine into the radiator and reservior to be air cooled by the radiator fan.

I hope this helps you.

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1 Answer

Heat won't work when moving.


sounds like the thermostat has a problem and needs to be replaced. The thermostat regulates temp and it defective can either stay closed or stay open and I reckon in your case it has stuck open permanently.
Your manual should show you where the thermostat is located.

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