1G Clogged heater core?

[Vincent Pandolph]

Just recently restored my 1990 Talon TSI AWD to drivable condition. Have no heat at vents, but both heater core hoses are hot. This car sat for 20 years before I purchased it. I'm thinking the core is clogged. Plan is to pressure wash with hose attached and alternate direction after like 30 minutes. It did have heat when I initially started the car and burped the coolant.

 

[AWD-Tony]

Just recently restored my 1990 Talon TSI AWD to drivable condition. Have no heat at vents, but both heater core hoses are hot. This car sat for 20 years before I purchased it. I'm thinking the core is clogged. Plan is to pressure wash with hose attached and alternate direction after like 30 minutes. It did have heat when I initially started the car and burped the coolant.

Flush it in both directions. If both hoses are hot, that means there’s flow. You should check both hoses while it’s warming up. If they get hot at the same time, it’s not flow. Possibly the blend door is stuck.

 

[Dericsh]

Possibly the blend door is stuck.

That was my thought, make sure the cable is still attached and everything that is suppose to operate is actually doing it’s job when you change the temp to heat.

 

[motomattx]

if you dont want to loose tune because you dont want to umplug your battery just get 9v battery adapter for your lighter plug it will help

This wont work on the DSM platform, the lighter outlet is only active with the key on.

 

[AWD-Tony]

You don’t have to disconnect the battery to flush coolant and I’m almost positive you don’t lose the tune on a safc when you disconnect the battery.

 

[motomattx]

Buy a container of Evaporust and cycle it through the heater core, let it sit in the core overnight and then flush with distilled water.

 

[007jimmy]

You can use compressed air to blow through the heater core also. Just connect a line to a empty jug/container and blow air through the opposite line. Beware depending on how much psi you have blowing through, the clog may blow out in force and potentially make a mess if your jug/container setup isn’t good enough.
Then flush with distilled water to get the remaining junk out. Hopefully it lets loose. But as others said check the blend door first before you open up the coolant system.