no heat no defrost
Chevrolet Q&AAsk Your Question
1995 Chevrolet S10 Question: my heater only blows cold air why the ac side works fine
Answer #1G. T. Service Center (4215 Answers) , Stephenville, TX - (254) 638-3236ProfessorG December 07, 2013, 11:32Master
First is the heater core hot to be able to have heat.
Answer #2pushrod December 07, 2013, 11:33Master
No vaccum to hvac. Maybe.
Answer #3bad007 December 07, 2013, 11:35Enthusiast
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.
ReplyProfessorG, December 07, 2013, 11:38Master
Do you know how many heater cores I have had to flush and both hoses were hot.
Replybad007, December 07, 2013, 17:12Enthusiast
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.
ReplyProfessorG, December 07, 2013, 17:17Master
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.