If the heat in your 1990 Chrysler New Yorker is not working, it could be due to a faulty thermostat, a clogged heater core, or a malfunctioning blower motor. You may need to have these components checked and repaired or replaced by a mechanic to restore the heat function in your car.
If all do not work - check fuse in power distribution block under hood
If the speedometer works but the odometer does not, the odometer has failed.
Bulb is probably defective. Replace it.
Your relay sensor is likely faulty
No.
They both work off of the same signal. If the speedometer works but the odometer doesn't, the odometer has failed.
replace heater relay and or heater blower motor
I have a 1993 Chrysler new yorker , i would only imagine it's in the same place. My relay had went out on it which prevented the turnsignals from working/flashing. The relay is located under the dash you have to remove the glove box , grab a flash light look up (about center of the dash near the top. Should be a round silver can just unplug it and replace it with the new one ( 3.00 part). And it will work.
Do tail and parking lights work? May be same circuit -- if they do maybe rheostat in variable dimmer switch -- if they don't may be fuse
The problem sounds like a power failure. Check all fuses, the plug connections, and make sure that wiring is not loose at the fuse box.
On a 1989, the speedometer signal comes from the sensor in the housing where the passenger side axle shaft goes in the transmission.
the cars weird. i have on and the ac doesn't work when its on but it does when its off