I by passed the heater core for now thinking that would be a short term fix until i could get the heater core replaced i also changed the thermostat at first also thinking that would fix the problem but there one solved the overheating issue and now i dont know what else to try
Make sure fans are coming on
SOURCE: 1999 Pontiac Grand Am Overheating
It is probably the problem. To make shure that need to change the gaskets, one of the symptoms use to be thet the temp rises when you are running at speed 50+ average, where is supposed that the car gets a lot of air due by the speed and nobody thinks that will be overheated.
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: Overheating 99 pontiac grand am
see if your radiator is getting hot it may be blocked, if it is hot in some spots and cold in others it is blocked, also have you bleed the cooling system after you did work to it
SOURCE: No reverse lights on 1999 Pontiac Grand Am
LOOK INSIDE FUSE COMPARTMENT AT BACK OF PANEL YOU SHOULD LIST OF FUSES AND THERE RELATED CONECTIONS .
SOURCE: leaking water from heater core 1999 gran prix
If leaking coolant under dash on passenger side floor broad it's your heater core. Call's for 2.8 labor flat time to remove heater core, in some case's you'll have to recover, evacuate and recharge your A/C system to remove your heater core.Sit under dash on passenger side.
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