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I have a 1991 Saab 900 base and the heater runs warm until you turn the fan to 2/3. I get no heat when idling. Dealer replaced the heater core (used unit) as well as selector. Any suggestions? I'm hesitant to return to the dealer as the above work was over three days (and a holiday).

Submitted: 31 days and 4 hours ago.

Category: Car

Value: $28

Status: CLOSED

Year: 1991
Make: Saab
Model: 900
Engine: 2.1

Already Tried:
replacing the heater core, thermostat, bleeding cooling system, replaced belts, checked fit on coolant resevoir.

Accepted Answer

hi , mostlikely the mixing doors arent closing/opening all the way, and when its on low, its able to catch some of the heat from the core, but when you turn it on any higher, it begins to suck in some of the cold air along with the heat, making the air lukewarm or cold. I would have them check the mixing doors, as that shouldve been one of the first things checked, over time, these doors tend to become weakend , or stuck, of if its vacuum operated, the hoses begins to become dilapidated.

Accepts:
Expert:	joe
Pos. Feedback:	97.2 %
Answered:	10/22/2009

ASE Certified Technician

ase certifed technician foreign and domestic

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Question

I have a 1991 Saab 900 base and the heater runs warm until you turn the fan to 2/3. I get no heat when idling. Dealer replaced the heater core (used unit) as well as selector. Any suggestions? I'm hesitant to return to the dealer as the above work was over three days (and a holiday).

Optional Information

Year: 1991
Make: Saab
Model: 900
Engine: 2.1

Already Tried:
replacing the heater core, thermostat, bleeding cooling system, replaced belts, checked fit on coolant resevoir.

Accepted Answer

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Question

I have a 1991 Saab 900 base and the heater runs warm until you turn the fan to 2/3. I get no heat when idling. Dealer replaced the heater core (used unit) as well as selector. Any suggestions? I'm hesitant to return to the dealer as the above work was over three days (and a holiday).

Optional Information

Year: 1991Make: SaabModel: 900Engine: 2.1 Already Tried: replacing the heater core, thermostat, bleeding cooling system, replaced belts, checked fit on coolant resevoir.

Accepted Answer

Related Car Questions

Year: 1991
Make: Saab
Model: 900
Engine: 2.1

Already Tried:
replacing the heater core, thermostat, bleeding cooling system, replaced belts, checked fit on coolant resevoir.