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I am not familiar with that particular car, however, you may find the ducts are missing from the heater to the dash outlets. Look under the dash to see if the hoses are intact. Another possible problem is the solenoid that operates the air valves may be stuck, or do not have proper vacuum to operate. So many things it could be. The dash controls may not be operating correctly, a vacuum hose loose, blockage somewhere in the plenum or ducting. These are all things to check. I hope this is helpful to you, and will get you on the right track.
Here is where most of your relays are, there is another relay box located inside the car on the passenger side under the dash. Sometimes youll have to take the glove box out to find the second relay box. This should have a cover on it sense most people do not know of this relay box its usually untouched. The cover will tell you what relay does what. But here is a pic with the relay center under the hood and should help you out.
First check your fuses .. make sure it is not blown ....Otherwise if fuses are ok ..Your Heater core is probably going ..or gone or you attenuator valve is not opening vents to let heat in ? is the floors/carpets wet ? especially on passenger side front or is the windows foggy wet ? Then you you need a heater core
there could be several resons for the overheating:
1. water pump doesn't circulate properly
2. Bad thermostst
3. fan clutch/radiator fan are non operative
4. relay is bad
5. clogged system
6. clogged radiator
to check on the the specific problem first power wash the radiator to remove bugs and road grime. they block the air from flowing over the fins and coil of the radiator thus not allowing the heat to disapate from the coolant. next install the good thermostat and make sure the spring part of the thermostat is facing down.next fill the radiator with coolant all the way up to the neck of the radiator and leave the cap off. next turn your heat setting to max fan and max heat temp. start the vehicle let the vehicle heat up and keep watch for the the flow of coolant soon as it goes down you should feel the upper radiator hose get real hot this indicates that the thermostat is working. now if you have a fan clutch for a conventional rear drive vehicle once the temp reaches 180 degrees the fan should no longer free spin it should start spinning faster if it is working like it should. if you have a transverse mounted engine for front wheel drive you will have a fan unit mounted to the radiator. these should be spinning when the engine reaches temp of 180 degrees. If they are not open the junction box and located the fan relay. switch out the relay with another one( I use the a/c clutch relay)if the fans kick on it's the relay that is bad, if it doesn't then either it's the fan unit itself or the temp sensor on the fan unit.now after you have done all these checks and everything is in order check the hoses going to the heater core at the fire wall they should be hot to the touch if they are not you have a clog at the by-pass of the water pump or manifold inlet.if the hoses are hot and you still have no heat then it's a bad valve inside the cab near the heatercore or a defective climate control module. check the fuse first to see that it is good.after the engine has been running a while the level of coolant should have gone down and then refill to proper level and replace cap after all of this if you still don't have heat and it overheats you have a bad water pump.... please rate this thanks