I have a 1986 Toyota Celica GT. I have two problems. The first problem is I don't have any heat. I have plenty of coolant, my thermostat is good and my engine is running halfway between cold and hot so it is getting warm enough. What it will do is it will blow cold air no matter how hot the engine is but if I shut it off and then back on sometimes it will blow hot air for about 10 seconds then it will go cold again. Second problem is I have no backup lights. The bulbs are good and I look for the fuse box but all I could find was two small ones under the hood. I need to get those fixed. I will appreciate any help that I can get.
The heater matrix is blocked up. There is no cure other than replacement. Back up lamps could be the gearbox switch wires are broken or switch is duff. Is the fuse box not in the lower dash? Check on google images.
If no heat you need to check out the valve and/or linkage that allows hot coolant to enter into the heater core. Re the lights you need to get a schematic that gives you the necessary data re hookup so you can track and correct the light issue. I would think it is the switch activated when you put the car in reverse.
SOURCE: 1993 Celica GT is leaking coolant. When I open the
Your thermostat isn't working properly obviously if it never goes above temp. it sounds like a radiator hose to me.
SOURCE: I have a 1986 Toyota Celica GT. I have two
The heat problem is more than likely the HEATER CONTROL VALVE, it is located in the small hose (1/2" to 3/4") that leads from the engine to the firewall & on into the heater core. You're getting heat because when you turn it off, the heat is travelling backwards into the system & warming it up, until you cool it down again with the heater fan.
A plugged heater core would be the other possibility but I would bypass the valve & even flush the system if it doesn't give you the results you want. That would be the next normal step in resolving the problem.
Easy Fix: Autozone does sell the part, but you may just need to check the vacuum hose that goes to it & turns it on to make sure it's working & not loose or broken. If you want to quickly fix it & not ever have the problem, buy a Prestone Flush and Fill Kit and install the flush "T" where the heater control valve goes and you'll have heat. You may need to install a longer hose to make that work but that's no big issue, just route as needed.
The back-up lights are controlled by a switch and if the fuse isn't blown, that would more than likely be the problem. The type switch depends upon your transmission type. The Back-up Switch mounts on the trans & knows when you are in reverse it allows voltage to pass on to the lights. In. a manual trans, only about 30.00. Either type switch can be bypassed with a toggle or push button type should the cost outweight the benefit.
good luck.
SOURCE: 1986 Celica GT fuse box
There is most likely no more fuses. There MAY be a fusible link (an inline fuse) in the wiring for the cruise control.
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