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I have a 2005 buick le sabre and the heater sometimes works and sometimes doesn't

When the heater does work and I turn on defrost then the heater will stop

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  • Buick Master
  • 2,210 Answers

Sounds like the heater matrix is blocked hence you have a little heat until you turn the blower on whereby it comes out cold because there's no more. Get someone to check the temp of the heater hoses when running and check for an airlock in the heater. These can be tricky to clear. Make sure the coolant is full at all times.

Posted on Nov 19, 2014

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Posted on Jan 02, 2017

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SOURCE: defroster / heater fan won't shut off /1995 Buick Le Sabre

Moe, I think you hi blower relay is bad. With this I mean the contacts in the relay are welded shut and you should replace the relay if the blower is on high all the time. Do this by removing the black plastic cover right behind the engine and removing the relay all the way to the drivers side of the relay bank. you will have to insert a small screwdriver under the relay and bend the little tang that holds the relay in place. then slide the relay out towards you and remove the green lock tab and unplug the relay from the wiring harness. if the blower finally stops then just insert a new relay in its place and reassemble in the reverse order. Good luck.

Posted on Dec 31, 2009

  • 1075 Answers

SOURCE: 99 Buick Le Sabre, AC and heater system blower

loose wire or connection,adrian,,,,,

Posted on Jun 26, 2010

BuzzFlewhart
  • 655 Answers

SOURCE: my 98 Buick Le Sabre heater blower works sometimes

Sounds like a bad heater control switch OR bad connector to the motor itself. I'd try your local salvage yard or EBAY for a replacement switch. Good Luck. . .

Posted on Nov 23, 2010

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Sounds like a bad heater control switch OR bad connector to the motor itself. I'd try your local salvage yard or EBAY for a replacement switch. Good Luck. . .

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Defroster / heater fan won't shut off /1995 Buick Le Sabre


Moe, I think you hi blower relay is bad. With this I mean the contacts in the relay are welded shut and you should replace the relay if the blower is on high all the time. Do this by removing the black plastic cover right behind the engine and removing the relay all the way to the drivers side of the relay bank. you will have to insert a small screwdriver under the relay and bend the little tang that holds the relay in place. then slide the relay out towards you and remove the green lock tab and unplug the relay from the wiring harness. if the blower finally stops then just insert a new relay in its place and reassemble in the reverse order. Good luck.

Dec 31, 2009 | 1992 Buick LeSabre

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