Zepher

iTrader: (1)

just wondering what is involved to swap it out.

I already have the engine bay ac delete box as well as the heater controls for the interior, just need to find an interior box and change it out.

DacMan

By heater box do you mean the core or the hole assembly because I changed my core today and it was a breeze.

Scorpner

iTrader: (4)

It's been a while but it's not bad. You do have to unbolt the dash and raise it up and basically unbolt it from the firewall. Some bolts from the engine bay and a few from the inside IIRC.

I grabbed the entire thing for mine because I'd rather just do it right and be done with it. Then the wiring, cables and controls all match up.

Zepher

iTrader: (1)

the entire assembly that the heater core sits in and diverts the air.

I have a problem when it is hot and rainy and my windows are up, all the windows will fog up.

Could be the heater box is not totally isolating the heater core when I have the temp controls set to cold.

My vent controls are defaulted to Defrost at the moment due to a broken vacuum line so that could be the issue as well,
but I do want to go to the non-ac controls so that it will look like a factory non-AC car.

Scorpner

iTrader: (4)

I might have an extra one. Not sure what I'd want for it, but the shipping would probably be murder on you. lol

If you do find one at a junkyard or something don't forget to get the side vents and controls for them located under the steering wheel.

camaronewbie

I don't think changing the heater box will help this any - all cars without A/C do this, it's a fact of life. You can crack the windows and allow some rain to get in to keep things from fogging, or don't drive in the rain. This is a simple matter of warm moist air trapped in the car with no air movement to alleviate it fogging the windows. A/C cars have cool dry air blowing which alleviates the warm moist air issue, all others just suffer.

Back in the 1970's when A/C cars were much rarer, this happened in everyone's car, new or old.

Now if the windshield fogs when it's not raining and you have windows down, that's a blown heater core, leaks hot coolant which steams on release and fogs windshield, and will follow with the coolant in the pass floorboard sooner or later.

But on a car with no A/C working, fogged windows is going to happen in the rain - go test drive a brand new anything in the rain and leave the A/C off and you'll see.

camaronewbie

I thought of a few other things...

1) which car? The 1986 might not have the heater diverter valve, so hot coolant is circulated into the heater core always, where as the 1988 probably has the diverter valve, so shouldn't circulate hoot coolant into the heater core. If it's the 1988, heater diverter valve may be stuck, broke, etc. - if it's the '86 you could install one. I removed my heater diverter valve in the interest of a clean bay, so I always have hot coolant passing through heater core.

2) Maybe the door is just not closing all the way. I noticed on my car today I was getting warm air out from under the center console, from up under the dash, just like I had the blower on but I didn't - so I suspect maybe my door isn't closing all the way either.

I don't remember - I think my door is controlled with a cable, but some of them might be vacuum controlled as well.

When I got caught in the rain today, I started to fog some, but not that bad - I set my controls to vent and cool (since I don't have A/C it was warm), but the vent was blowing cooler air out than what was trapped in the car.

Don't know if any of that helps ya....