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check thermostat to be sure enging is getting hot.
Heater control on dash opens doors to direct air flow. check that cables are working behind the dash control. you should hear the doors open and close.
Also there are vacume operated doors. Srart with replace vacuve lines on engine. At the front of vans, as you open the hood there is a round plastic vacume chamber. It is easy for the vacume line the come off there.
There are "vacume engines" that make use of the vacume to open the doors. These can wear out.
Mine has always been vacume lines either broken or disconnected.
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∙ 13y ago
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Why would a 2001 Chevy Blazer heater only blow cold air?
Low coolant in the system. Defective heater control valve. Clogged heater core.
Why would a heater on a 2001 Chevy Blazer blow cold air if the thermostat was just replaced?
The heater valve could be failing to open for one reason or another.
Why does your 2004 Chevy heater blow cold air?
There is a divertor controller under the dash that controls between heat and cold. Sometime the wireing harness works loose.
How will the heater react if the heater core is stopped up?
Your heater will blow cold air only.
Why could cause the heater in 1994 Chevy Cavalier to blow cold air only?
Either the linkage from the temp control unit to the valve on the heater core (which is behind the radio and temp controls) or it is the heater core itself.
On a 1998 Chevy blazer what would cause the heater to blow cold air?
Check Antifreeze level..make sure there are no leaks under the vehicle.
Why would a house heater blow out cold air?
It doesn't really blow it out it just warms the cold air.
Why does the heater blow heat while driving and cold at idle?
you need to replace your heater core
How can you tell if heater blower is not working?
it wont blow heat itll blow cold air
On a 1998 Chevy Blazer what would cause the heater to blow hot air then cold and occasionally back to hot?
Either a faulty thermostat or you have a low coolant level.
Why does Kia Sorento heater blow cold air?
you are low on coolingliquid !
Why would you smell antifreeze and heater blow cold air?
heater core possibly plugged and leaking
