0
Why does the heater only get warm when you accerlate at high speeds and when you idle it blows cold air?
Afroking
I'm sure that you might have checked this, but that is often caused by a low level of coolant. You also might check the valve that allows coolant to flow through the heater core. Also, try replacing the thermostat in the upper radiator hose or where it mounts onto the engine. this contols the engine coolant minimum tempature. Lastly, I've seen blown or leaking head gaskets do this also, but that usually has other signs.(coolant recovery bottle with bubbles in it or coolant gysering out the top)
On '04 to '09 Mazda 3 it is very difficult to remove air from the coolant system, and the heater will work exactly as you have described until the air is out of the system. The fluid level is fine in the degas bottle(reservoir), but the heater will not blow hot at idle. Rev the engine in Park for 3 mins @ 3500RPM. let idle for 1 min, repeat as many times as necessary to get heat when at idle.
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
Why does a 2005 Nissan Altima heater blow cold air when idoling but blows hot air at constant speeds?
Poor circulation from a restricted/plugged heater core. Try flushing it.
1996 vw sharan heater blows cold cabin hot?
can you please clarify what you mean, do you mean that the front heater blows cold but the rear blows hot or do you mean that when the heating is on cold it blows hot? many thanks paul
Why does my 2001 Chevy Prism heater blows hot air on highest fan speed but the lower speeds it blows cold air?
It has a bad "Blower Motor Resistor" The fan switch itself is fine.
If the heater works but blows cold air and heater core is good what do i check next?
Get the air out of your heater core.
Ac works but heater blows cold air?
heater hoses might have been disconected
Why would your heat only work on defrost?
ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air? ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air?
Your heater in your jeep only blows cold air why is this?
The most common reason a automobile heater blows cold air is the water level is low. Check the water level and fill to the appropriate level.
Heater problems on ford 1999 expedition?
the heater blows warm air when fan is on low but blows cold air when fan is turn to higher setting
Why does Heater blows cold air on 2001 blazer?
you must have low coolant or a bad heater core
2002 dodge ram 1500 4.7 liter heater not working blows but not hot air?
we changed radaitor & thermastate , now heater blows cold air
Why does your heater blows cold then hot then cold then hot?
It is because your heater is having to heat up so its blowing cold air out while its heating up.This means your heater is not very efficient and it needs to be checked.
Car heater blows cold air when not driving?
A car heater taps off engine heat. If you aren't driving, then the engine is cold and there's no heat for the car heater to use.
