Gmc Sierra Heat Issue

sierra09ny · December 16, 2009

I have a 2009 gmc sierra crewcab . im haveing a problam with the heat and remote start . It seams in the am i start the truck and no heat comes out the blower doesnt come on . I get in the truck drive down to get a cup of coffee and go reuse the remote start and now the heats on ... I brought the truck back to my dealer who in turn told me this is normal..That i dont believe . In the summer it didnt matter if the ac was on or not if i hit the remote start it would be on when i opened the door to get in .I was curious if anyone else was haveing the same problam or could direct me where to get a better answer then the 1 i recieved from my dealer .And also the heat and ac is electronic not manual . thankyou doug

SeirraRR · December 16, 2009

Mine does the same. But when the truck starts to heat up it starts to come on slowly to blow out the warm air. Then after the truck has been run for awhile when you use the remote start it's already warm and blows warm air out. Other wise when you turn it on and the heater starts blowing it would just blow cold air. That is my guess not to sure but its what I kinda figured out. Hope this helps you out.

minibike132 · December 16, 2009

I have a 2009 gmc sierra crewcab . im haveing a problam with the heat and remote start . It seams in the am i start the truck and no heat comes out the blower doesnt come on . I get in the truck drive down to get a cup of coffee and go reuse the remote start and now the heats on ... I brought the truck back to my dealer who in turn told me this is normal..That i dont believe . In the summer it didnt matter if the ac was on or not if i hit the remote start it would be on when i opened the door to get in .I was curious if anyone else was haveing the same problam or could direct me where to get a better answer then the 1 i recieved from my dealer .And also the heat and ac is electronic not manual . thankyou doug

It is normal, I'll try to explain. When you start the vehicle in the summer the engine does not need to warm up for the a/c to work. The compressor needs to kick on right away and the air needs to start blowing in order to cool down the cabin.

Conversely in the winter the engine needs to heat up first. There is no heat for the vehicle to blow till the engine is warm, that is where the heat comes from. If the vehicle instantly turned the blower on it would take longer for the engine to heat up because you are pulling air across another radiator. The thing that makes heat in the vehicle is called a heater core but it is the same exact thing as a small radiator except it's inside the vehicle instead of in front of it. If you are pulling cold air across it that extends the time it takes to heat up the motor. Which in turn would result in a longer period of time spent waiting for heat to come out of the vents. The blower is left off to let the engine heat up to a range where it can actually blow some warm air at you instead of blowing ice cubes.

EDIT: I know what I'm talking about and I confused my self after reading it. IT'S NORMAL!!!

daveschmidt · January 7, 2010

I have a 2009 gmc sierra crewcab . im haveing a problam with the heat and remote start . It seams in the am i start the truck and no heat comes out the blower doesnt come on . I get in the truck drive down to get a cup of coffee and go reuse the remote start and now the heats on ... I brought the truck back to my dealer who in turn told me this is normal..That i dont believe . In the summer it didnt matter if the ac was on or not if i hit the remote start it would be on when i opened the door to get in .I was curious if anyone else was haveing the same problam or could direct me where to get a better answer then the 1 i recieved from my dealer .And also the heat and ac is electronic not manual . thankyou doug

sierra09ny · January 7, 2010

I have a 2009 gmc sierra crewcab . im haveing a problam with the heat and remote start . It seams in the am i start the truck and no heat comes out the blower doesnt come on . I get in the truck drive down to get a cup of coffee and go reuse the remote start and now the heats on ... I brought the truck back to my dealer who in turn told me this is normal..That i dont believe . In the summer it didnt matter if the ac was on or not if i hit the remote start it would be on when i opened the door to get in .I was curious if anyone else was haveing the same problam or could direct me where to get a better answer then the 1 i recieved from my dealer .And also the heat and ac is electronic not manual . thankyou doug

sierra09ny · January 7, 2010

WELL first let me say oopps for the repost of my paragraph ..and yeah thankyou guys ... after i posted the question i thought about it a bit . and figured the computer was probably set to keep it off till the engine gets warm .and sure enough i let it run 10 minutes it warms the engine and i hit the start again and it defrosts the windows after the second start ...was just a lil frustrated with the good old people at the dealer they dont give you much insight to it all ...

ffee and go reuse the remote start and now the heats on ... I brought the truck back to my dealer who in turn told me this is normal..That i dont believe . In the summer it didnt matter if the ac was on or not if i hit the remote start it would be on when i opened the door to get in .I was curious if anyone else was haveing the same problam or could direct me where to get a better answer then the 1 i recieved from my dealer .And also the heat and ac is electronic not manual . thankyou doug

NebulaTig · December 15, 2010

Sorry for bumping up an old thread but I have to say thanks for this. It solved my problem. I guess it makes sense that the engine should have to warm up. It would be nice if it was in the operators manual though.

This forum also helped me solve my dome light switch problem (duh).

Thanks all!