Hello guys new to this forum

My 1990 integra A/C and heater only works on the "HIGH" position. I figured it was the blower motor but come to find out this past weekend after replacing the Blower motor that was not the problem. So the next step is to replace my relay?? Can someone tell me where this relay is? and how to replace it? or point me to a link to read on it. I did read my manuel but it was not specific on where it is.

Many thanks
Oscar Manalansan

P.S. replacing that blower motor was a pain in the A$$!!! but got it done.

I did just install a JVC Cd player in it as well

Thanks in advance