Stock 99 Si, with bolt ons

Noticed my needle was above normal, so I slowed down, turned the heater on and it went back to normal.

Now whenver I turn the A/C on the needle goes up, doesn't matter if i'm idleling or driving.

What could be the problem? My radiator fan is coming on......

Any suggestions?

 

Let the engine cool and top off both the radiator and the reservoir with coolant. Then bleed the cooling system.

 

^^ i agree.

 

^^^Me too. Check if the condenser fan kicks on also.