Question about 1998 Oldsmobile LSS
The front defrost, vents and ac buttons seem to be mixed up. Air conditioning comes out the defrost and no air at all from the vents in front seat area. Now no heat in front and only in the back seat area.
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Posted on Jan 02, 2017
If you have a late model GM car and the system is controlled electronically the blend door actuator becomes weak. When this situation occurs it will not move the air direction door inside of the heater/air conditioner plenum. in your case not to the vents Replace the actuator with new and recheck the system. i hope this helps
Posted on Jul 24, 2009
i beleive these are a vacuum system. if air temp is in cold position you will get no heat. listen for hissing noise with motor turned off but key on. if you hear hissing noise you have a hose broken or off. you will have to find it
Posted on Oct 30, 2009
Sure it stops blowing when you turn it off because the off switch still works. that part of the system is totally separate. The blower speed is a seperate circuit from the heat, vent, defrost, and recirculate circuit. Where the hot air blows from is decided by little doors that redirect the warmed air from the blower. Those circuits are vacuum operated according to Ottawa. So it makes sense that you either have a very bad vacuum leak or you might have a bad vacuum motor. A good mechanic should be able to find the problem in a short amount of time.
Posted on Mar 22, 2010
The system in your car is all vacuum controlled so the first this you need to do is locate the main vacuum source under the hood. It is normally located on the passenger side near the firewall. You may see a plastic ball shaped canister or it could be square. Make sure that device has vacuum going to it from the engine
Posted on Sep 03, 2016
Testimonial: "is it the 1 that has 2 lines coming out of it its black next to the wiper motor"
SOURCE: need help on a 88 olds 98 regency brougham with a digital climate control when i switch to turn on defrost the air comes out of the front vents instead of the defrost what could cause this switching f
Broken vacuum line from the engine to the vacuum ball or controller. Could be the vacuum motor also.
Posted on Sep 05, 2016
Testimonial: "what vac ball and which controller and where is located theres a black box that has 2 vac lines 1 line goes to inside of car connected to a purple wire that goes into hub and the other hose goes to engine and the cruse control"
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