Check the coolant level in the radiator it may be low
and starving the heater core
Not much to go on but...
First, BE SURE YOUR VEHICLE'S COOLING SYSTEM IS FULL!
If not, FILL IT! If it keeps 'disappearing' after a few days or a few
weeks, your engines gaskets are probably worn beyond ignoring. (I
killed my Malibu by ignoring the issue, I loved my Malibu... sigh...).
They MUST be replaced before the engine oil and coolant 'become one
with each other' (BTW... this is bad).
If your engine is
full, and your coolant hoses become firm (firm by means of pressure
from heated gases and liquids expanding in your cooling system) after
running a while...
I would start with the Thermostat...
If your engine is not running anywhere near 195 degrees Fahrenheit
after running for about 15 minutes, your thermostat is most likely
stuck open and , therefor, your engine is not warming up to operating
temperature. Just watch your temperature guage on your next trip to the
market. My 2003, Chevy, 2300 V6 engine needs to warm to 150-160 to even
start to heat the vehicles interior and during very cold conditions, it
may take up to 175-180 before good 'hot' air gets going.
Be aware other issues can cause this as well. Water pump
failures and blockages in the system can cause COLD air blowing from
the heater as well. If the air is cool or WARM, go with the thermostat
first. It's inexpensive, and 'relatively' easy to do.
Good Luck!
HEATER NOT
BLOWING COLD,NO HOT AIR FROM HEATER,A/C BLOWS HOT AIR,A/C NOT BLOWING COLD,
COLD AIR FROM HEATER,BLEND DOOR ACUTATOR CLOSED,HVAC UNIT NOT OPERATING,
http://alltypesofpartsreplacing.blogspot.com/2012/12/heater-not-blowing-coldno-hot-air-from.html
HEATER NOT
BLOWING COLD,NO HOT AIR FROM HEATER,A/C BLOWS HOT AIR,A/C NOT BLOWING COLD,
COLD AIR FROM HEATER,BLEND DOOR ACUTATOR CLOSED,HVAC UNIT NOT OPERATING,
http://alltypesofpartsreplacing.blogspot.com/2012/12/heater-not-blowing-coldno-hot-air-from.html
To troubleshoot this types of problem,click the link below
:----http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the
issue.
------
Engine Overheats and heater
blowing cold?
http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html
---------
Heat blows cold on drivers
side and hot on passenger side?
http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html
-----------
This will help.Thanks.
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