We have a 1992 Mercury Capri 1.6 liter not turbo. The temperature guage is reading above normal temperature but still below hot. The heater is blowing lots of air but it never gets hot. The heater core is getting warm but still no heat. Car has a new radiator and thermostat. Radiator fan is kicking on. All of the coolant hoses are hot which implies that it is circulating because we suspected the water pump or heater core but the hoses coming into and going out of both of those are hot.
If the hoses to and from the heater core are hot , and you say the heater core is hot , then the only answer is that the air duct that flows into or out of the heater core plenum ( housing ) is not opening.
Heater control on dash borad inoperative.
Not sure about 92 capri , some cars have a cable linkage , some work on vacume motors.
Try to find a haynes manual for your car , they will walk you through almost every step of anything you may ever want to do to your car.
You seem to know what you are doing , but I gotta ask ........the heater core you felt was up behind the dash inside the passenger compartment of the car right ?
Remove the radiator cap on a cold motor (that's the only really safe time) and then start the motor. When the motor warms up, you should see a good flow past the opening. If you don't, your thermostat is stuck (or your pump isn't pumping). Even a new stat can go bad or not be in the hole right. Some have a little hole that has to line up with something.
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Yes, the heater core was under the dash under the firewall. Thanks for the advice, on my way to buy a manual now.
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