Question about 1999 Buick LeSabre

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I have no heat cuz the heater door under the hood is closed. how do i open it? Also it only blows out the defrost.

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The cable has become disengaged for the heater door
stick a coat hanger under the dash where the heat would come out and try opening the door from there

Posted on Sep 12, 2009

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My 2002 sebring LXI is not throwing out cold air when heater is on


Could be low on coolant, or the thermostat may not be closing, or there may be a problem with the blend door under the dash.
The engine thermostat is closed until the engine warms up, so if it is stuck open the engine never warms up.
The blend doors under the dash direct air thru the heater and the vents.

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It sounds like your heater controls are not working. They are usually operated by a vacume line. check under dash passenger side behind glove box for the vacume line disconected ps check engine side first its easier. if vacume line is good chech vacum at heater box their is a meatel vacume unit that opens and closes the heat and defrost doors. if your heat is only comeing out of the defrosters The doors under the dash are not opening and closeing. ChecK the metal vacume unit . A vacume pump can be purshed at parts store some have a loner program.

Nov 26, 2010 | Chevrolet Beretta Cars & Trucks

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A/c and heat only blow from the defroster and, I have no heat at all. what would be the solution to these issues or where do I start in the troubleshooting process?


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Oct 06, 2010 | 1987 Nissan 300ZX

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Driver's side defroster and heater vents blow cold air but the passenger side blows hot. Both sides should blow hot The temp is set any temp and it still does the same thing. It is winter so I don't know...


The doors that open and close in the heater control unit are ran by motors. It sounds like a motor has quit in yours. When turning on the defrosters the motor closes the door to the heat for the floor

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My thermostat was running low on temp.(thermostat was stuck open) at the time the heater, defrost, a.c., etc. were working. i replaced my thermostat and now my defrost is the only thing that blows. the...


your blend doors work off of vacum, check vacum line under hood close to firer wall ( there should be 1 vacum line that goes into the firer wall ) check it for vacum.

Nov 20, 2009 | 2006 Chevrolet Astro

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2005 chevy truck a/c works cant get heat blows cold


This sounds like a valve problem, or a heater/ cool air door stuck.
Many GM vehicles, have under the hood, a valve, it is electronic or vacuum controlled. When you switch the lever to heat, this valve opens, thus letting hot water flow through to the heater core.
On some newer models, there is a door (flap so to speak) within the interior compartment. This flap opens and closes between heater core and interior, thus controlling hot air flow.
Have you check to insure there is sufficient coolant in the system?
Low coolant levels will also cause no heat, but will also show signs of engine running warmer, sometimes much warmer than it should.
The valve under hood was as used on my 1995 Astro van. the mechanism looked to work as you could see shaft move in and out, problem was the diaphram or flap in valve on end of shaft (inside valve and not visible) was detached.
The other method, interior door or flab within heater box assembly was a problem on my 1998 Ford Expedition.
Yours, being GM, I would check for this valve under hood. It will be somewhat obvious in most cases as it will have heater tubes running into it and from it into firewall.

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Hi under the hood the hoses going into the fire wall from the engine on one of the hose you have a valve which is open and close by a solenoid when it's defective it stays open check and close the valve

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1 Answer

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Hi: On the back of the heater control unit are vacuum lines, make sure plug is firmly attached. FIRST though check if vehicle does not go into 4WD high. If not then you probably have a vacuum problem under the hood as vacuum controls heater, 4WD and other functions. Check to make sure vacuum lines under the hood are all attached starting with the vacuum pod (located in front L fender by brake module.) and chasing them under the hood. If you have vacuum then check heater control module and lastly heater door vacuum actuators. Hope this helps.

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common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

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Your Vent Doors Open And Close By Vaucum So Have Your auto Repair man Check Your Vaucum Lines Starting Under Your Glovebox And Then Working His Way Out Under The Hood

Good Luck

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