heater blows cold on passenger side AND p0171 bank 1 code. Related?
#1
heater blows cold on passenger side AND p0171 bank 1 code. Related?
I have two issues on my 1998 LeSabre Limited.
1) Heater blows nice and hot on driver'* side and small backseat vents (on back of armrest) BUT blows nothing but COLD air on passenger side. This is true upper, middle, lower vents.
2) The check engine light just recently popped a p0171 code, bank 1.
Is there any chance these are related (vacuum leak)? If anyone has any ideas for fixing either/or, I would appreciate any guidance.
1) Heater blows nice and hot on driver'* side and small backseat vents (on back of armrest) BUT blows nothing but COLD air on passenger side. This is true upper, middle, lower vents.
2) The check engine light just recently popped a p0171 code, bank 1.
Is there any chance these are related (vacuum leak)? If anyone has any ideas for fixing either/or, I would appreciate any guidance.
#3
Senior Member
True Car Nut
Joined: Sep 2006
Posts: 4,816
Likes: 245
From: Windsor, Ontario / Detroit, Michigan
I am not 100% certain, but I think the HVAC mix doors on your car are vacuum activated. There should be a vacuum manifold located behind the glove box with several different colored vacuum tubes branching off of it. Your HVAC issue and the vacuum leak code could be directly related.
Do you have automatic temperature control, or manual?
Do you have automatic temperature control, or manual?
#4
Thanks. I'll research and let you know. Also important to note -- this Buick has only 43,000 miles on it. Bought it cheap from a guy who inherited it from great grandparents so it'* not gotten much mileage. I do think some of the hoses, etc., could be wearing out, but engine, etc., should be fine.
#6
I am not 100% certain, but I think the HVAC mix doors on your car are vacuum activated. There should be a vacuum manifold located behind the glove box with several different colored vacuum tubes branching off of it. Your HVAC issue and the vacuum leak code could be directly related.
Do you have automatic temperature control, or manual?
Do you have automatic temperature control, or manual?
I do think a complete inventory and service of failing vacuum lines would be in order, especially the rubber ones.
The plastic ones are probably fine until someone looks at them wrong, at which point they shatter in to a zillion tiny pieces.
#7
Senior Member
True Car Nut
Joined: Sep 2006
Posts: 4,816
Likes: 245
From: Windsor, Ontario / Detroit, Michigan
For what it'* worth, the ATC system on the 98 LeSabre has a self diagnostic system that might shed some light on your problem. Press & hold the OFF, AUTO, and RECIRC buttons for 1 second, after which the DTC'* will display for 2 seconds each and then return to normal operation. The DTC'* are 2 digit numbers, and I am sure we can find a chart somewhere to interpret them. If you go into diagnostic mode and all that happens is the temperature flashes, there are no trouble codes set in the system.
I still think you are looking for a vacuum leak behind the glove box, but it also could be a broken plastic gear in the blend door actuator (very common on your vehicle).
I still think you are looking for a vacuum leak behind the glove box, but it also could be a broken plastic gear in the blend door actuator (very common on your vehicle).
Last edited by 2kg4u; 01-06-2017 at 10:40 AM.
#8
UPDATE: I really think the heater issue is related to bad blend door actuator, and will be working on it this weekend.
However, the p0171 code has been coming and going. Currently, it is not showing at all. I do plan to run some tests this weekend to see if I can pin down what it might be.
FYI, I tried this but nothing happened: "Press & hold the OFF, AUTO, and RECIRC buttons for 1 second, after which the DTC'* will display for 2 seconds each and then return to normal operation."
However, the p0171 code has been coming and going. Currently, it is not showing at all. I do plan to run some tests this weekend to see if I can pin down what it might be.
FYI, I tried this but nothing happened: "Press & hold the OFF, AUTO, and RECIRC buttons for 1 second, after which the DTC'* will display for 2 seconds each and then return to normal operation."
#9
UPDATE: I really think the heater issue is related to bad blend door actuator, and will be working on it this weekend.
However, the p0171 code has been coming and going. Currently, it is not showing at all. I do plan to run some tests this weekend to see if I can pin down what it might be.
FYI, I tried this but nothing happened: "Press & hold the OFF, AUTO, and RECIRC buttons for 1 second, after which the DTC'* will display for 2 seconds each and then return to normal operation."
However, the p0171 code has been coming and going. Currently, it is not showing at all. I do plan to run some tests this weekend to see if I can pin down what it might be.
FYI, I tried this but nothing happened: "Press & hold the OFF, AUTO, and RECIRC buttons for 1 second, after which the DTC'* will display for 2 seconds each and then return to normal operation."
#10
I have two issues on my 1998 LeSabre Limited.
1) Heater blows nice and hot on driver'* side and small backseat vents (on back of armrest) BUT blows nothing but COLD air on passenger side. This is true upper, middle, lower vents.
2) The check engine light just recently popped a p0171 code, bank 1.
Is there any chance these are related (vacuum leak)? If anyone has any ideas for fixing either/or, I would appreciate any guidance.
1) Heater blows nice and hot on driver'* side and small backseat vents (on back of armrest) BUT blows nothing but COLD air on passenger side. This is true upper, middle, lower vents.
2) The check engine light just recently popped a p0171 code, bank 1.
Is there any chance these are related (vacuum leak)? If anyone has any ideas for fixing either/or, I would appreciate any guidance.
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