Most likely have a loose wire in the connector or corrosion on the contacts in the connector
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/joseph_f4ed739f62995525
SOURCE: Replace heater core in Pontiac Grand Am GT 3.4l
ram a sharp chissel or pointed head centre punch through the core and prise it out .,than tap the new one in place ,,,there u go bobs ure uncle
SOURCE: 2002 Pontiac Grand Prix Thermostat
as you face the engine the thermostat bell is on the right (drivers side) Follow the radiatoe hose. Remove the two bolts and raise the bell still attatched to the hose. the thermostat is there with the rubber seal. You can gently pry the thermostat out with a screwdriver or something similar. Put in new thermostat be sure it is the same as the old one, and then replace or change the seal (be sure it is the smae size and thickness as the old one as I got the wrong size from Napa) Then replace the bell, and tighten, but not over tighten. I hope this helps!
SOURCE: Where Is The Camshaft Position Sensor Located On
Front of engine above crankshaft pulley. If you need a picture of it send me your email address and I will send you a picture.
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SOURCE: where is the coolant sensor located for a pontiac grand am gt
It looks like this with a connector to it and is on the side of the engine block:
Look right under the radiator hose.
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