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Why does my heater not work?
1990 Saab 900

Why does my heater not work?

(1990 Saab 900)
Just blows cold air, although the temperature is right where it should be on the gauge.
1 answer & 4 comments
Popular Answer
on November 05, 2014
Faulty temp control.
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on November 06, 2014
Thanks for the suggestion. What is the temperature control and where is it? Part of the heater?
CDACAM
on November 06, 2014
Need to determine what type of system you have , cable or electronic controls (I don't have that info handy) , sorry. Next would be visually inspecting under dash , checking what items are visible (might have to remove lower covers) and which are responding to which controler(temp door , fresh/recirculate , mode -defrost-dashvent , floor etc. The whole SYSTEM is what you are inspecting , not just a single part.
on November 07, 2014
Great. Thanks. Sounds like a week end spent on the floor of this great old car.
on November 07, 2014
Have patience , a bright flashlight and the right pair of glasses(if needed). A helper to work controls while you observe would make things easier.
General Diagnosis
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on November 05, 2014
Faulty temp control.
Sign in to reply
on November 06, 2014
Thanks for the suggestion. What is the temperature control and where is it? Part of the heater?
CDACAM
on November 06, 2014
Need to determine what type of system you have , cable or electronic controls (I don't have that info handy) , sorry. Next would be visually inspecting under dash , checking what items are visible (might have to remove lower covers) and which are responding to which controler(temp door , fresh/recirculate , mode -defrost-dashvent , floor etc. The whole SYSTEM is what you are inspecting , not just a single part.
on November 07, 2014
Great. Thanks. Sounds like a week end spent on the floor of this great old car.
on November 07, 2014
Have patience , a bright flashlight and the right pair of glasses(if needed). A helper to work controls while you observe would make things easier.

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