Chevrolet Q&A

Ask Your Question

1999 Chevrolet Silverado 1500 Question: Heater will only blow cold air. Why will it not get hot?

 

Question

tomcat500, Brownsville, TN, October 19, 2011, 04:53
 Rookie

It got hot last winter but when I tried it this year it will not get hot. Engine temp is running 190 and there is no sign of anything being wrong like leakage from heater coil or anything. Air conditioner works fine and Fan works fine.

2 Answers
Flag This
  • Answer #1

    October 19, 2011, 07:12
    Profile_thumbnail
     Master

    core could be clogged with debris. blend door motor may be bad as well. take it to a shop and have them check it for you and give you a bid.

    Roy

    Reply
    Flag This
  • Medium-star Best Answer
    January 05, 2014, 11:44
     Enthusiast

    I had that problem..took off the hoses and blew compressed air through core in reverse direction as water several times and now it works. Found that on you tube

    Flag This
  • Reply

    petedano1972, November 19, 2014, 07:17
     Rookie

    Any way you could post a link to that video? I have the same problem. Just replaced the blend door actutor under the drivers dash, but now it just blows cold air all around instead of just half the vents. I found that if I cycle power to the system by turning the truck off and back on, that it fixes the issue temporarily.

    Reply
    Flag This