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My heater only blows cold air why the ac side works fine

(1995 Chevrolet S10)
in Reedley, CA on December 07, 2013
no heat no defrost
Displaying 3 answers & 3 comments
Popular Answer
on December 07, 2013
No vaccum to hvac. Maybe.
of G. T. Service Center on December 07, 2013
First is the heater core hot to be able to have heat.
on December 07, 2013
Make sure the coolant level is up in the rad, not just the recover bottle If both . Run and check the heater hoses, both should get hot. If one is hot and the other not, plugged heater core. If both are hot the blend door motor may be bad. Fan on high switch hot to cold, you should be able to hear a change in the sound if the motor is working.
of G. T. Service Center on December 07, 2013
Do you know how many heater cores I have had to flush and both hoses were hot.
on December 07, 2013
When someone has COLD, not WARM, either there's no flow threw the heater due to being plugged and there's always a huge different in temperature from the inlet hose compared to the outlet hose, real low on coolant or actuator that works the blend door failed.
of G. T. Service Center on December 07, 2013
No sh t. Are you trying to teach me and like I said just because both hoses are hot doesn't mean the heater core is hot enough to put out heat in cold weather. So why the lesson that I learned in 1968.
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