Well, I decided to change out my battery cables and just realized at least one reason I do not have heat in my car is that somebody removed the Heater core? did not notice it when I bought it and was told the fan just was not working. So I guess now I have some more work to do. Also I was wanting to know what the plastic piece that goes up over the valve cover is? Mine does not have one on it, is it needed? Boy somebody did some work on this car and not sure if it is good. Also I found that the Fusible link box must have been replaced. I found that all the wires to it are wirenuted together. I will fix that next. I will take some pics of what they did and post them. They put a real fancy "not" light switch cover plate over where the lines went it for the heater core.

 

Did they remove the heater core or just bypass it? The heater valve (water ****) is a common leak point.

The plastic fan and tube that goes over the top of the valve cover is the fuel rail / intake manifold cooler. If at any point during the drive the coolant got to or above 221*F, when the engine is shut off the fan comes on for 17 minutes. The FSM clearly outlines this.

As for the fusible links, many people have created their own fuse blocks to replace the now hard-to-find oem links. Just make sure you use proper rated fuses.

 

Cool, thanks for the info. I will check to see if that is what they did on the heater core and fix it. I have to look and see why the blower fan is not coming on anyway. Ok, I see on the plastic piece, could that be why my front fan on the radiator is not coming on? All the good stuff on this one. I did go download the factory manual, so It has helped a bit. some parts on it are a little confusing but I will get it all sorted out.

 

??? I thought we were talking about the injector cooling fan??? Only the turbo model had a fan in front of the radiator, and it comes on when the a/c is active. If you have an electric fan on your 79, someone put on an aftermarket one.

 

From what I recall the Hvac system is in 3 sections starting from the drivers side. Heater core/and vacuum modulators. The a/c evap. Lastly the blower box. Mine was bought with out "everything" and was a nightmarish pain in the *** to swap from the donor car. Still missing chunks of duct and I only have heat to the windshield. So I wonder after all that work digging to remove a heater core they just never installed anything back in? But the blower motor is connected to a very large white wire. or are we talking rad fan?

 

Forgot. You never said if the core was still in the car. You should have two copper 3/4 in pipes pokeing a inch out of the fire wall? Or do you see two empty holes and the back of your stereo like I did.

 

the "pipes" coming through the firewall are the 2 freon connectors for the AC, not the heater, you can see the ends of the heater core next to the heater control valve. The two rubber hoses coming through the fire wall are the heater core supply and return lines. To get to your heater core, you need to removed the AC section after you remove the blower section, it comes out pretty easy after you get the stereo and glove box out of the way. Most likely you will remove some of the ducting, it is really easy to get back in place, each end has a unique shape that will only connect to the correct place. After taking mine out about a dozen times trying to get the control valve to work properly I could do one of these in my sleep, and vary well may have a few times. You can remove the heater section with most of the vacuum lines connected to the slider control. I did a little write up on it. Also the vacuum lines are color coded, but still use some masking tape to label anything you disconnect to speed up putting it back together. If you were close I'd come by and do it for you, I might even have a good core, replaced mine and found out it was the valve leaking, not the core.

 

I will take a picture of the fan today, and post it so you can see it, also my AC Pump is disconnected.

 

I will see if I can get under the dash to see if there is any heater core in it at all. I will also try to show what they did under the hood. I think somebody was just making it a summer cruzer and did not care about heat.

 

[QUOTE=Lesnocker;332943]From what I recall the Hvac system is in 3 sections starting from the drivers side. Heater core/and vacuum modulators. The a/c evap. Lastly the blower box. Mine was bought with out "everything" and was a nightmarish pain in the *** to swap from the donor car. Still missing chunks of duct and I only have heat to the windshield. So I wonder after all that work digging to remove a heater core they just never installed anything back in? But the blower motor is connected to a very large white wire. or are we talking rad fan?[/QUOTE

I am mainly concerned with the heater core problem, I think I may be headed for the same headaches you went through.

 

Yea yea yea they are two rubber lines connected to two copper pipes lol. Its not that bad to do. You will have to remove the stereo and the stack. What my issue was. The car was to be track only but the regulations at our local tracks forbid T-tops and convertibles with out a 4 point cage. So I bought to convert back to a weekend cruiser. So the wiring harness was chopped and I had nothing left behind the dash. No duct work at all which some of it is was up in the back of the dash which I couldn't get to with out tearing out a brand new dash. So I just piece worked the wiring and a few of the ducts. The selector is a B!%^H Didn't take notes from the donor. So I gave up and bent the valve that gets air up to the windshield since anytime you need it is rain. Rather have defrost Mine is a 600.00 Banger so really don't get" Graveyard car'" on restoring it correctly yadda yadda.

 

Ya, I only paid 900 for mine. But I live in the Midwest so I have to get some sort of heat to the windshield like you talked about.

 

Well, I was wrong. I did find that the heater core stuff is still hooked up. I guess it is the AC stuff that was removed. I also found that somebody hacked up the wires to the heater fan trying to make it work.

 

I also found that the fan on the front of the radiator is aftermarket, and not even hooked up. they had a long wire for it just sitting there under the hood.

 

Ok, back to the injector cooling fan. Here are picks of that side of the engine. doesn't look hacked up, but no fan at all and do I really need it?

Ok I added some other pics to show you my new battery cables, the fancy work somebody did on the fusible links, and cracks in my rubber tube for my throttle body. I guess I need to find a good repair for them as well.

 

It really isnt that hard to take out and put back in, its in 3 big chunks, each is bolted to either a bracket on the trans tunnel or fire wall.

Take a look at my post, should look a lot like what you have.

https://www.zdriver.com/forums/280zx...-worthy-39110/

 

Wow, That should be very helpful for me, Thanks man.

 

Ok Guys is there any real gain buy removing all of the emissions crap on these cars. Mine is a California equipped car and I live In Iowa so I do not need all that. but I also don't want to remove it if it don't give a real benefit to the performance of the car.

 

No, there is no "gain" (I assume you mean hp) from removing emissions components. People remove them to clean up the look of the engine bay, and when altering the intake setup.

 

I like the look of the cleaned up intakes, I have seen on here. But my Z is more like Joe Dirt, so I think I have a lot of other things to work on. On a better note I got to drive mine to work for the first time today, the weather was good. I also had time to stop at a little mechanic shop by me and check out a 74 260z and a 79 280zx like mine. The 74 was setup with all the drive train from a ZX, with 5 speed. It is a real cool ride, but the 79 zx was a automatic and was in way worse shape them mine and the own wants 6 grand for it. Not sure what he was smoking but it will never sell. The shop owner did ask me if I would sale mine, and I nicely said I was not ready to get rid of it unless he could find me a 510.

 

Got the blower working now, but found when I pulled the radio that I am missing the duct from the heater box to the center vents. It looks like I could make one real easy if I cant find one online. Also does anybody know what the micro switch that is just laying next to the heater controls by the vent is for?

 

It's probably the A/C switch or whatever its called, when you turn the heat options into the AC zone, it clicks that little switch, turning the A/C clutch on, it also turns the engine idle up to 1000 rpm or something, I assume to account for the added load from the A/C and to increase fan speed to cool the A/C condenser.

I saw you mentioned earlier that the A/C was disconnected. If your not going to put the belt back on, then I say just keep this micro switch disconnected, unless you want to have a cool button that increases your engine RPM.

 

Cool, that is what I need to know, I guess I will just leave it laying where it is at. another problem down, lord knows how many more to come. But it has been real fun so far. Thanks again

 

Well, I got my radio fixed. I had it all done and my Pioneer deck kept reading a fault and restarting. So I disconnected the ground from the wiring harness and hooked it straight to the body. Now it works great, I only have alpine 6x9's in it now, maybe I will hook up some front speakers if I find some that fit.

 

heres a diagram of the duct work