78 280z heater help!
 

my buddies 280z ' 78 heat isn't goin through his defroster but instead all other areas, i haven't had a chance to look at it but does it operate off a vaccuum like my zx or manuel like my 240z what shall be done to fix the switches to get air to go up all diagrams are greatly apreciated email to www.madhatter2b@mail.com
we are goin to look at it on tuesday he is havin header - complete exhaust put on and primerin car
all input is of help and i thank u who have helped me in past and those who can be of help now and in future Q's

Re: 78 280z heater help!
 

pull the dash off the hoses have probably fallen off

Rusty Datsun x 2
1x Primer Gray 260Z 2+2 (Soon to be WRX blue)

Re: 78 280z heater help!
 

so is it operated of of vacuum hoses like my zx and diaphrams or are you just refering to the defroster hoses because they are intact i spoke w/ my friend and he says it goes through the other vents but eventually kicks on and goes throught the defroster outlets maybe takes while to build up vacuum pres leaks i don't know i would really like diagrams so i can give them to him and he can operate on it like a mad man at a frankenstein convention

Re: 78 280z heater help!
 

Actually, that sounds like a leak in the defroster canister line. That happened on my 280Z once. In the engine compartment there is a round canister that builds pressure to move levers for your heater/defroster controls. Mine had an old cracked line running to it. Replacing the line fixed the problem. In this picture, the canister I'm talking about is below the oil cap, along the right side of the engine compartment.
https://www.zdriver.com/rides/spec/p..._989887192.jpg

http://www.zipcon.net/bleach/pages/zcar/zlogo.jpg

Re: 78 280z heater help!
 

I just fixed this EXACT same problem on my 77 last week. I fixed mine by replacing the small vacuum lines around the vacuum solenoid switches on the passenger side just above the vacuum resevoir. There is a small "T" fitting there with small vacuum hoses attached (only about 1" long) these may need replaced. Check condition of all lines in this area. I also shot some WD-40 into the bottom of these switches to free them up. Check all attachment points under the hood first before up dig into your dash. Even a small leak in the system can cause the acuator door under the dash not to function. Check also condtion of hoses under the hood and replace as needed. The system is realtively simple so check undr the dash for loose attachments or removed lines. Just behind and above the radio is the heater vacuum attachment point(kind of a round thing with a few vacuum hoses on it) look for removed or leaky lines here. Check the vacuum assembly on the right side ust up under the dash(you can see it with a flashlight) and check for secure hoses there as well. This assembly controls your door which diverts air over your heater core. Most of these probs are just amatter of leaky or non attached hoses in the system. As I said, start at the small hoses under the hood. Good Luck. RH

Re: 78 280z heater help!
 

thanks everyone i'll get this info to him so he can begin to tinker thanks amillion your all great

Re: 78 280z heater help!
 

i went and talked wit him jst now turns out he had just fixed it
bet you wont guess wat it was
low coolant ya his buddy said he had checked it and it was full but aparently not well thanx anyhow for all ur posts