My ac & heater does not work. It has worked in the past sporadically. It worked fine up until about 9 months ago. Since then it may have come on a total of 10 times. It acts like it has a short. I've check the fuse. Please help. It is horrible driving in the rain with no defrost.
Disconnect the wire from the fan, turn the car on, test the voltage between the connector to ground (chasis) on all fan speed settings (high,med,low). If you have voltage at all settings (approx. 12.3V on high and less as the speed setting is lower) then replace the fan motor (about $50 at autozone). If there is not voltage on all speed settings you will also need to replace the blower motor resistor (about $12 at autozone). The whole process takes about 20 mins.
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IF you had the system re-gassed and it worked fine for a while then there is a leak in the system. Leaks occur at the compressor seal behind the pulley ( repairable ) in pipes and fittings and in the evaporator and condenser ( corrosion holes from acidic process when there is moisture in the system from running without gas.) Unfortunately the only fix for this is new parts . There is a uv light and yellow coloured glasses that show up the leaks as a green dye, so have this done first to determine the degree of cost before you commit
I have had the parking lights on my 1998 forester stay on w/ no way to turn off. Used the remote door lock to lock and unlock car and the lights went off?????????? This has happened twice with the same solution
The thermostat cannot cause your heater to go out, though the heater will run a little cooler if the thermostat is stuck open. Please see my tip athttp://www.fixya.com/cars/r6235876-no_heat_fan_blowing_cold_air to troubleshoot the heater. In particular, I would start by checking the temperature control cable adjustments. I have pasted instructions from autozone.com below.
If you really want to change the thermostat, please see my tip at http://www.fixya.com/cars/r5929960-s_thermostat . The thermostat is in the housing at the end of the upper radiator hose. For the speedo, It's probably a broken cable. Have someone take the cable off the tranny and spin the cable in their fingers while you watch the speedo. If the speedo works, the problem is with the gear in the tranny, else the cable is broke. Let me know if you have more questions along your journey. :o) Heater temperature control cables to blend door and heater water valve--adjustment: WATER VALVE CONTROL ROD
See Figure 8 When adjusting the water valve control rod, disconnect the temperature control cable at the air mix door lever and then adjust air mix door control cable. Next, adjust the control rod. Reconnect the temperature control cable and then readjust it.
Push the air mix door lever in the correct direction.
Pull the control rod in the direction shown (in the accompanying illustration) until there is an 0.08 in. (2mm) clearance between the ends of the rod and link lever. Connect the rod to the door lever.
TEMPERATURE CONTROL CABLE
See Figure 9
Move the temperature control lever to the cold position. Push the cable sheathing and the air mix door lever in the correct and then tighten the clamp. Verify proper operation.
I had the same problem on my 2004 Corrolla and ultimately it only worked on high. The dealer charged me $45 diagnostic fee and almost immediately told me it was a part called the blower resister. They knew the answer right there and then but only realesed it when I agreed to pay the diagnostic. They charged me 179.00 to fix the AC and later I found out the part cost $8.95 and a novice could have replaced it themselves.