Replaced gaskets . heater core radiator
This could be the blend door on the heater. It is stuck on the wrong position because it is not fully in the heating mode. I certainly hope that no one changed all those parts without checking the mode and blend doors first.
SOURCE: 1998 Pontiac Bonneville heater problem
take the upper radiator hose use a glove and while the car is running squeeze the hose together and see if trys to open in your hand and if it doesn't you have a weak water pump but check the condition of the drive belt and the coolant before you go to the pump
SOURCE: I have a 2005 Grand Prix and last week while the
it really sounds like a thermostat to me it wouldn't be a heater core
SOURCE: car overheating, blows cold air out vents, changed
A couple of things to check because as you describe your symptoms you actually have 2 problems
1. No heat from vents.
Sounds like the heater water flow valve cable is kinked disconnected or the valve itself is stuck You will need to follow your heater core water supply lines to find the valve usually to the right of the center console in the ducting area / large plastic housing for heater and AC internal coils. If the valve works then there is a possibility that the heater core water supply lines have been bypassed on the engine side of the firewall with a coupling due to a leaking heater core. And l;astly the heater core could just be clogged. (quite rare!!)
As for the overheating engine after all of the work you have done.. Perform this simple test.
1. remove radiator cap
2. have someone else start the car
3. watch for water coming out of the open radiator cap area DURING start...
4. have person in the car rev engine gently 2 or 3 times. No need to exceed 2000 RPM. If water rapidly flows out of the radiator during engine revs.. you have some major engine issues.
If it passes all of these checks then the only thing left is improper hose connections on the engine side of the firewall and or a hydraulic water lock in the block that should clear itself by starting and stopping the engine many times with the radiator cap off.
SOURCE: where is the heater core located on the 2005
almost all heater cores are located under the dashboard, just above the passenger's feet, encased in a black plastic box. It ain't easy to take the dash apart and change it. I would first make sure it is not under the GM warranty as 5 years is too short a life for the core. If it is out of warranty then I would get a new core at a parts store and pay an auto heating and air conditioning repair shop to put it in. That way you beat the high dealer parts and labor price.
SOURCE: 2006 Pontiac Grand Prix, Vent blowing but no heat coming out..
have your thermostate checked.
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