I switch from hot to cold but it still blowing hot air a 99 Acura CL

What is your question?

I used to heat in the winter time and now it's summer I flipped it back but it still blowing hot air I don't know did the door switch back over or what

What makes this problem better or worse?

I changed from the Heat too cold but it still blowing hot air

How long has your 1999 Acura CL had this problem?

Just started this summer