I acquired a 1984 wagon that runs great. Couple of small problems though. First the heater does not work on settings 1 or 2 but does work on settings 3 and 4. Also, when the heater runs it tends to run noisy and then quiet once it warms up. Second, the overdrive does not engage sometimes unless I re-clutch, then press the button. This usually take 3 or 4 tries before it engages. Any help on these problems would be greatly appreciated.