I bought a 1986 Nissan 300zx about 4 or 5 years ago. Dash and controls are completely digital. Air c

I bought different sites to see cheaper airline tickets a 1986 Nissan 300zx about 4 or 5 years ago. Dash and controls are completely digital. Air conditioning never worked right from the start. In addition, it constantly blows out heat whether the air is on or not. It has been to two Nissan dealerships for repairs and neither dealer could figure out what is causing the issue. Any suggestions would be greatly appreciated
The heater/climate control different sites to see cheaper airline tickets in that car has its own computer for one thing. The temperature sensor is in the roof by the windshield, between the t-tops. There is a plastic cover and under that is a small fan with a couple of wire sensors coming off of it. I would check that. Be careful to not remove it if you don't have to because they are kind of a pain to put back in correctly. Other than that, are you familiar with how to adjust it?
jdawg... I've had two 86 300ZXs since 2000 and I've had to overhaul the climate controls on both of them because of the exact same problem you have. The climate control uses three vacuum servos to change the position of the air doors in the climate control box, controlling both air temp and air flow. Since these cars are now 20-25yrs old, the rubber in the servos has dried out, cracked and no longer work. They have to be replaced, and its a good idea to replace all the vacuum hose around the climate control box too.
This is a major interior teardown. Both seats, the steering wheel and the entire dashboard have to be removed to gain access to the climate control box. Luckily, with the steering wheel and seats removed, all you have to do is unbolt the dashboard (2 on each side, two under the console, and eight along the defroster vents), unplug 3 harness plugs at both ends, then pick up the dash and walk out with it completely intact. At this point the climate control box can be unbolted from the firewall and transmission different sites to see cheaper airline tickets hump, unplugged and pulled from the car. There's one servo on the left side and one servo on the back (which is why it has to be removed to be worked on... sigh) The third servo is intake air recirc and is on the blower air box next to the passenger door.
I figured this all out using the factory service manual for the 86 300zx. This is an invaluable resource for doing your own troubleshooting and repairs. And it can be downloaded for free off the internet.
Can you tell me where to get the servos, does Nissan different sites to see cheaper airline tickets still sell them or an aftermarket part. I have an 85 2+2 and parts are getting hard to come by. I am the original owner by the way. - Thanks George
Another great resource is www.z31.com. In addition to a forum and lot of maint and repair info, they also have a complete copy of the z31 300zx parts microfiche on line. Its hard to get around in, but usually you can find the part number of what you're looking for so you can search the internet for it.
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