I have a '87 Toyota Celica GT-S w/ 3S-GE engine and the automatic climate controls. The coolent level is good and the engine temp remains good while running. The system won't move the heater control valve under the hood so I remove the control wire and set it manually. Still nothing out of the vents but cold air. I have also checked the fuse and it's good.
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first check radiator level if it is full and the heater is working good make sure temp gauge is functioning c orrectly it is most likely the coolant temp sensor but if this is a high milage vehicle and you have owned long time and never changed i would also replace thermostat and check plug to temp sensor forr good conections and good wires
Can be that your heater core or hose inside car is sometimes releasing alittle heat at the clamps. So long the inside of the floor is not wet or damp or car is not over heating. I would not worry about the heater to much inside unless this does not work... Change the automatic climate control up or down to cooler or warmer i usually run it at least upto 10 or 20 degrees different than the outside anytime i drive mainly during rain or snow.. So if outside it is warmer means you need to be cooler and cooler means get warmer. Also If you don"t run that on a regular basis a quick Ac on and defroster front and back works well and generally fast.I really think that is all of your problem just get comfortable with your automatic climate setting. once in a while it may happen again only because of rapid temp. changing from outside air to inside air in your car..Rain X works really well for a couple weeks between apps.and saves wiperblades during raining times. Always drive safely and good luck
For 83-86 Camry, 87 corolla, 84-87 pickups and 4-runner: Code 12 = knock sensor or circuit (distributor or circuit on Cressida, Supra, and Celica 3S-GE)
87-90 Camry, all other models 88-90: Code 12 = Rpm signal/no NE or G signal to ECU within several seconds after engine is cranked.
All models from 1991 on: Code 12 = Rpm signal No "Ne" signal to the ECM within several seconds after the engine is cranked. No "G" signal to the ECM two times in Succession when engine speed is between 500 rpm and 4000 rpm.
There is no problem with your computer box, it says 3S-GT on it, thats the way toyota did them back then. same with the 3S-FE (says 3S-F on the comp. box) and 3S-GE (3S-G on comp. box.) i dont recommend removin the cat. you will get defected (or waht is equivelant to a defect where you are) due to smog and stuff like that. Turbo timer is wired to the igntion system, no problems there. and as for gauges: get a pro to install them, but there should be zero trouble.