HOW TO REPLACE ACTULATOR DUAL CONTROL
Grand Prix 1997 to 2003 Factory Service Workshop repair manual
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Grand Prix 1997 to 2003 Factory Service Workshop...
Covers Grand Prix 1997 1998 1999...
SOURCE: a/c and heater
Is it leaking antefreeze?
The thermostat might be gone or needs a bigger thermostat
It could be a vaccum leak for the drivers side blowing cool air and the passenger side blowing warm air
Does it have dual air control switches one for drivers side and one for passengers side?
SOURCE: 1998 grand prix no heat on 1 side
thats most likely what it is. either that, or something has fallen down the defrosters and its blocking the blend door from opening or closing
SOURCE: AC blows cold on drivers side and hot on
Try checking the fuses for the passenger side HVAC system.
SOURCE: 1999 pontiac grand prix gtp dual airconditioning
Two things can be the problem,first,try adding ,a little freon,if it is low,it will only cool one side,then if this does not help,there is a door actuator motor that controls this,it could be not working,the dash has to come out to replace this actuator motor,if this was at all helpful,please rate,thank you.
SOURCE: heat blows hot on passenger side but cool on driver's side
Most likely it is the climate control unit. Had the same issue with my 99 Regal, replaced the climate control unit and haven't had any issues since. Might try Digital Dash Solutions on eBay, they will ship you a refurb at1/3 price of buying from a dealer if they have one available. If not, they also have a climate control repair service. I'm not certain that they fix Pontiac products, but it wouldn't hurt to ask.
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