did u bleed the coolant system of air cuz that could be the reason
Because the engine is still running while in neutral. Your problem is probably your radiator or lack of antifreeze. Antifreeze serves as what it's name implies and as as a coolant. Additionally since the automobile is not moving forward the radiator is not receiving ventilation provided by the incoming air.
it sounds like your coolant over flow tank is leaking. it is a common problem with these cars. might also check your radiator for leaks or your exhaust for coolant, but if there is coolant in your exhaust that would mean blown heads
If it gets cold enough the coolant will freeze and crack the block if there is no antifreeze.
No that's a clogged radiator issue. However if the engine over heats to much, the head will warp and you'll need a new one. Replace your radiator, Engine Coolant Temperature Sensor, and thermostat.
Fill it up with coolant. If it gets low again I'm guessing you have a hole in your radiator. Replace it.
Where is it leaking? That pressure test sounds funny, why would you pressurize only the pump and radiator? If you are leaking coolant outside the engine, locate the source. If you are losing it from the radiator but cannot find a puddle suspect a head gasket problem. Check the Radiator cap first, if it is bad high pressure coolant will travel back to the overflow bottle.
There might be a leak in the water pump, or in the radiator. Maybe even check the radiator hoses for cracks and leaks.
Check your cooling fans in front of the radiator. It could be a relay or fuse to your high speed fan motor. Also, check your coolant temp sensor, antifreeze level, and or thermostat again.
if you can read voltage in the water of a radiator , then there is a problem and the water needs to be drained and flushed and new antifreeze installed . if you are using full strength antifreeze, it must be mixed 50/50 with distilled water only. never use tap water in a radiator ! Thanks Jim TAnother viewThere is a specific problem that can be checked with a volt meter, I do this every major service (spring and fall) I check coolant voltage with engine running to engine block and chassis.If you read more than the error level for the meter you have a ground problem and this is grounding through the cooling system and will damage the cooling system. Most likely the radiator
If you smell antifreeze after turning off your 2003 Grand Am, it could indicate a coolant leak, often from a damaged radiator, hose, or a blown head gasket. This smell typically arises when the engine heats up and the coolant escapes, either as steam or liquid. It's essential to address the issue promptly, as low coolant levels can lead to overheating and potential engine damage. Checking the coolant level and inspecting for leaks can help diagnose the problem.
I would check the hoses leading into your radiator, and also the overflow for antifreeze. If that is not the problem, it could be your heater core. Your heater core might be leaking, you might have a hose leaking
You need a new radiator. Honda put a transmission cooler core inside your radiator so the trans, under "normal operating conditions," won't overheat. If that core starts leaking into the engine coolant...well, there's your problem.