Why would the heater in a 1996 Sunfire blow warm air but never get hot?
Feel the hoses. If they both are hot, it is the mixing door at fault. If one is hot and the other one is just warm, it is either the control valve or the core is stopping up. If both are just warm, change the thermostat.
just taking a shot in the dark but is that supposed to read where is the heater core really located on the 1996 Pontiac sunfire??if so its located under the dash of the car,towards the floor board behind the heat exchanger box..if you are asking where the heater core relay is ,,well there is no such thing so need to ask where this is.
Is it an electrical cord that looks like it would plug into a standard AC outlet? If so, it's probably involved in keeping the car warm in cold weather. It could be a block heater, a battery heater or an oil dipstick heater. Some block heaters are mounted inline in one of the radiator hoses. When plugged in, it heats and circulates the coolant through the block. The battery heaters are essentially a small heating…
Check your temperature gauge. If it shows the engine is running in the normal range then there could be a problem with the "air door" that controls how much air is brought in through the heater core. Or the core itself is plugged and needs to be flushed out. If the guage shows the engine is running cold , then you should have the thermostat replaced.