No heater?

Tiny
BIGTEX
  • MEMBER
  • 1999 BUICK PARK AVENUE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 150,000 MILES
Need fix for hot air coming out of only passenger side of 1999 Buick Park Avenue.

The heat comes out the passenger side just fine, but only cold air blows out the driver side. A/C works normally so I only noticed it when it got cold here. Same thing in auto or manual settings.

I put the heater on manual, 90 degrees and high fan, then directed the airflow out of either the lower vents or the dash vents. Either way, the air coming out of the driver's side vents is unheated. The passenger side is blowing hot air both ways.

I'm thinking that there is a separate heater core on driver's side that is not getting hot water.
Monday, November 15th, 2010 AT 2:47 PM

54 Replies

Tiny
ERNEST CLARK
  • MECHANIC
  • 1,730 POSTS
Do you have "Dual Climate Control"? If so, then the controls and/or the switch for that is faulty.

If not, then the "Diverter Door" inside of your HVAC unit is faulty.

This guide can help

https://www.2carpros.com/articles/car-heater-not-working

Let me know, as well if you intend to repair this yourself and I'll walk you through the procedure.

If you just need advise for dealing with a shop, I can help with that as well.
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Monday, November 15th, 2010 AT 2:56 PM
Tiny
JJARKO1
  • MEMBER
  • 9 POSTS
My vehicle has similar problem, although I have plenty heat but passenger side only has a/c. Was diagnosed as blend door actuator, would this be correct?
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Friday, November 19th, 2010 AT 5:20 AM
Tiny
ROGERBRUSACORAM
  • MEMBER
  • 1 POST
My Vehicle has the exact same problem as BigTex. Is this something I can fix myself?
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Wednesday, December 15th, 2010 AT 2:14 AM
Tiny
ERNEST CLARK
  • MECHANIC
  • 1,730 POSTS
The diagnosis and repair procedure would be the same if the vehicles and options are the same. However, the problem wouldn't be with the blend door but the "Diverter door".
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Wednesday, December 15th, 2010 AT 3:12 PM
Tiny
VET
  • MEMBER
  • 2 POSTS
  • 1999 BUICK PARK AVENUE
  • 165,000 MILES
No heat blowing on driver side but heat is blowing on passenger side and at idle at a stop light more then 3minutes it kicks in hard and acts like it wants to shut down but it does not can you help me please
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Monday, April 27th, 2020 AT 12:39 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,124 POSTS
Does this vehicle have dual climate control?
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Monday, April 27th, 2020 AT 12:39 PM (Merged)
Tiny
VET
  • MEMBER
  • 2 POSTS
Yes it is dual climate control
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Monday, April 27th, 2020 AT 12:39 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,124 POSTS
Have you checked the blend air door near the heater core. There are two with dual climate control. It sounds like one is working and the other isn't.
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Monday, April 27th, 2020 AT 12:39 PM (Merged)
Tiny
RALLB
  • MEMBER
  • 1 POST
  • 1998 BUICK PARK AVENUE
  • V8
  • AUTOMATIC
  • 175,000 MILES
Car getting hot what's norm temple i
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Monday, April 27th, 2020 AT 12:40 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
When cruising over 40MPH is will run aroun thermostat temp of 195 but when idling or in slow traffic it can rise to 225-228 because the cooling fan is programmed to let it run hotter in those conditions.
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Monday, April 27th, 2020 AT 12:40 PM (Merged)
Tiny
LRBLATTER
  • MEMBER
  • 2 POSTS
  • 1998 BUICK PARK AVENUE
1998 Buick Park Avenue

The heater blows cold air on the drivers side and warm air on the passenger side. This is true in the defrost, vent, and floor modes.
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Monday, April 27th, 2020 AT 12:40 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
You have dual climate controls? Are there any hvac codes? Maybe the code would point in the right direction. With dual control, there are temp sensors on each side. I can't say the temp sensor is faulty?
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Monday, April 27th, 2020 AT 12:40 PM (Merged)
Tiny
LRBLATTER
  • MEMBER
  • 2 POSTS
There are dual climate controls, do not know about codes, as I do not know how to retrieve them.
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Monday, April 27th, 2020 AT 12:40 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Some of the national brand autostores used to check some codes for free. Don't know about B codes? You can call and ask? You can get a code reader, just make sure it will read all manufacturer specific codes, plus generic codes.
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Monday, April 27th, 2020 AT 12:41 PM (Merged)
Tiny
MYREPAIRAID
  • MEMBER
  • 2 POSTS
  • 1998 BUICK PARK AVENUE
  • 123,600 MILES
Which actartor side do I need? In winter weather the heater blowes cold air on the driver side and heat on passgar side. What would be the repair cost over all?
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Monday, April 27th, 2020 AT 12:41 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
See if your car is vacuum or elctricall operated actuators. It could be a vacuum leak to a motor or the otor itself is not working. The pic i'm sending isn't for your car but I cna't find one anyhow so it's kind of generic, but will give you an idea. Also the vacuumleak could be form teh motor as well. Repair parts vary depending on brands etc. Just call an auto parts store
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Monday, April 27th, 2020 AT 12:41 PM (Merged)
Tiny
MYREPAIRAID
  • MEMBER
  • 2 POSTS
THANK YOU FOR GETTING ME HERE.
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Monday, April 27th, 2020 AT 12:41 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Ya I screwed up I sent you the wrong drawing this other one may lead you in the rightdirection. It is generic as well.
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Monday, April 27th, 2020 AT 12:41 PM (Merged)
Tiny
TERETHOMAS
  • MEMBER
  • 2 POSTS
  • 1998 BUICK PARK AVENUE
  • 120,000 MILES
My ac or heat is not working if I turn the heat on nothing blows and if I turn on ac same thing so I looked at fuses for about 5 mins swapping them out and I noticed my 2 engine fans in the front are not moving at all I put car in reverse and in drive with the hood up and still no movement from the fans it gets a little hotter than what it supposed to but hasnt overheated yet. What could this be please anybody help.
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Monday, April 27th, 2020 AT 12:41 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuses for hvac to see if it is blown. One fan shold come on when the a/c is turned on. Pic shows location of fuses to check. This could be a module problem as well an dneed to be scanned to find problem.
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Monday, April 27th, 2020 AT 12:41 PM (Merged)

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