Well that usally means you have a rat or mouse nest in your heater vent box. Pretty common if you live near open fields. Take the vent box apart to view any blockage from the heater core to the vent box or a hanger gently down the vent opening see if you pull grass or straw out.
It doesn't have a timing belt so, the answer is no.
Perhaps water pump is leaking?
defrost is the default mode. in most cases a vacuun leak is the culprit.
When there is a problem in the vent system it defaults to defrost setting. Check the doors & vac supply
I need a blower motor and blower motor resistor for a 1999 lasabre will the regal have the same part?
Your rodeo has 3 actuators. One is for your evaporator(cool air) another for your heater and the other one controls your defrost , face and lower vents. These electrical actuators are about the size of a donut and have a hole in the middle with a bushing which engages with your vents, located under your dash board on the passenger side.It may take alot of unscrewing and alot of patience, but its the only way to solve your problem.
You have to remove the air vents/hazard lights/defrost button with a screwdriver and then there are 2 bolts that you take out above the radio and that's it.
Check for vacuum leak either under the hood or under the dash Check the operation of the vacuum actuators Check the selector switch Defrost is the default setting on this system
Yes, any 1999 Buick will have a chain.
Where is the a Alternator located on 1999 buick lesabre
You have a vacuum leak somewhere. Check under the hood for a disconnected or broken vacuum line.
Where are the relay switches on a 1999 Buick Century for the headlights