Pretty easy to put on these. Are you running the stock top mount or have an aftermarket FMIC? The topmount, you have to removed the stock re-circulating valve, block up the hole in the EFI pipe (50p coin will do) and place a breather filter on the rocker cover or install a catch can. For the BOV inlet use the line that the stock valve goes into on the inlet manifold. Job done.
They do sell new Toyota ones on Camskill. :: http://www.camskill.co.uk/m19b0s1296p14126/TOYOTA_OE_GENUINE_PARTS_-_Chromed_Rocker_Cover_Nuts_and_Rubber_Washers_EP82_and_EP91_Starlet_Turbo Bit pricey like.
If you've got no running issues then I'd bank on your heater matrix either being broke up just blocked up. Mine's freezing cold in the GT but I've never been bothered to flush the matrix out to see if its blocked up. Temp gauge pulsing up and down would indicate a buggered thermostat. Easy job to replace and cheap enough to buy.
Good luck claiming back from the council, even if you have compiled a whole folder full of evidence to go with your claim. They just don't want to know.
Take the door card and bits off then have a look but I'd bet its the window motor. If your as lucky as me, it will more than likely fail when you've just put the window down ,20 miles from home, petrol light on and pissing down with rain