I have no heat in my 95 4s grand am but. the ac works great.

Pontiac Grand Prix Climate Control/AC - Car Forums at Edmunds.com

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Dec 29, 2007 - 30 posts - ‎20 authors Hi Joe, I had the same problem with no heat on my 2000 grand prix. .... motor and the exterior temperature sensor have both been replaced ... Pontiac Grand Prix Electrical/Lighting
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Fixing AC Temperature Control on my 2002 Pontiac Grand ...

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Jul 13, 2014 - Uploaded by Turbo231
Fixing AC Temperature Control on my 2002 Pontiac Grand Prix... How To Install Replace AC Heater ...

Have you not googled your obd codes
& diagnosed them, to find a problem

No idea why you would do all you did

You always resolve code related issues first

The coolant temp should be 210 all the time

Sounds like your not looking at scan tool data
or following any factory trouble charts or actually
know what coolant temp is,your just assuming & not
doing the required testing to verify things

refill the ac

see if the fan is working should come on with the ac on

Hi!!
When the Blower Motor Resistor (controls blower speeds) goes bad, the blower motor works only on HIGH SPEED. REPLACE IT.
BLOWER MOTOR RESISTOR Removal & Installation

• Disconnect negative battery cable.
• Remove right lower instrument panel insulator panel.
• Disconnect blower resistor connector located behind right side of dash.
• Remove blower resistor screws and blower resistor.

To install, reverse removal procedure
Good Luck!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa!!

i have the same exact problem! The temp sensor replacement did nothing for it either

The control for the AC/Heater door isn't working. To have AC the door has to close so that the hot air is not being blown into the car. When this door is closed it allows the cool air to pass through. This is either controled by vacuum or a ele. switch

Check your thermo stat

try the fuse,if not that the wiring is bad from the fan to the switch.

if ac dont work idleling it start to work when you move our fan is not coming on because when you activate the ac compressor kick in and fan should come on if it start to be cold only when you drive the force air cool the condensor ac work temp goes down HOPE IT HELP FIXYA OUR POST THANKS . PIERRE