No heat
Thread Starter
Cruising
Joined: Nov 2006
Posts: 11
Likes: 0
From: Clearwater Fl.
No heat
1990 coupe,no heat at all from any vent,both heater hoses are hot so flow is ok thu core,has electronic climate control. Susepct heater control door is not opening?? how to check this out?what activates this door? Any help?In Florida, but still gets chilly.
Team Owner
Joined: Jan 2003
Posts: 20,318
Likes: 248
From: Summerland B.C. Canada
Good luck 
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Your flow may not be ok. If the core is plugged, coolant flows over the top, but not through the core. Can you imagine what would happen if it stopped altogether?
Check the temp door motor first. Remove the Blower Module on the left side of the Evaporator Case and look inside to see the door. While someone operates the controls, make sure it moves between 60 and
90. If not, see if it will move by pressing on it with a screwdriver. If it flops around, the linkage is held onto the motor that controls it with a plastic clip and it's probably broken. Access from the passenger side after removing the Hush Panel.
If the door doesn't move when you push on it, the motor has probably frozen. That may have set a troublecode. Is an LED on the Control Panel Flashing?
If the door works, the core is plugged. Check the condition of the cooling system closely as the early aluminum head motors are prone to galvanic corrosion and that plugs it up. If it is plugged, disconnect the hoses and flush it with a garden hose or compressed air. If that doesn't work, you'll need to replace it.
Check the temp door motor first. Remove the Blower Module on the left side of the Evaporator Case and look inside to see the door. While someone operates the controls, make sure it moves between 60 and
90. If not, see if it will move by pressing on it with a screwdriver. If it flops around, the linkage is held onto the motor that controls it with a plastic clip and it's probably broken. Access from the passenger side after removing the Hush Panel.
If the door doesn't move when you push on it, the motor has probably frozen. That may have set a troublecode. Is an LED on the Control Panel Flashing?
If the door works, the core is plugged. Check the condition of the cooling system closely as the early aluminum head motors are prone to galvanic corrosion and that plugs it up. If it is plugged, disconnect the hoses and flush it with a garden hose or compressed air. If that doesn't work, you'll need to replace it.
Thread Starter
Cruising
Joined: Nov 2006
Posts: 11
Likes: 0
From: Clearwater Fl.
thanks for the help
found proble to be sticky air mixture door modulr, worked it back and forth manually thur outside opening a few times, now it operates fine. maybe from lack of use in heat mode?
