89 honda accord ... which fan is for engine cooling
 

It's an 89 accord with AC.
the AC is never used, but there are 2 fans. If i face the engine, the RHS fan runs, but the LHS fan does not.

The car is overheating, but I'm confused about which fan is which.

I thought the rhs was the AC fan, but it's the one running as the car overheats. I never see the lhs fan activate even with the temp gauge pegged.

Any suggestions?

Thanks