It was 28* last night, and I have no heat in my car. I pulled the core today and I can't tell if its the core or the control valve leaking.

 

I'm thinking of undoing my byapss and hooking the core up underhood, then starting the car to try to find the leak.





Sorry about posting two threads, this forum is slow as **** sometimes!

PS: Does anyone want a write-up on an 84-85 dash removal? I took all the necessary pictures.

 

Yes, please.

 

Hey, I'd have to say it's your valve, I've read on here that the heater cores rarely go, and on my GSL-SE it was the valve. Anyway, I ended up buying a whole heater unit from someone with a good valve and heater core allready on it. Here's a picture of what my valve looked like. Isn't it fun taking the dash out

 

My car has been idling for the past 20 minutes with no heater box, just the core.

No leaks.

Ugh.

 

I'm going to get a new valve this week, I have some other things to do while my dash is out.

Pele, I will do the write up, but I have to host the pictures on the forum, which is going to take a little while. I have 40+ to upload!

 

Take your time man. I've gotta get the car running before I worry about the dash and stuff.

 

I would appriciate the write up too! And, it should be archieved when its done.....

What do the valves do?


Thanx, Laterz, Andrew

 

When you put the hot/cold selector to heat, it allows coolant to pass though the heater core.

 

Here is the core hooked up, with no box. I'm sure you can tell where the heater control valve is

 

Thats a stupid design. One of the few on the 1st gen, I might add. Most cars put those things under the hood. Easy to change when it breaks.

 

I know, all the GM products I've had have had them underhood.

The way the pipes run with all those couplers is ridiculous too.

 

its under the dash on fox body fords too

 

But that's Ford... We already know Ford products are poorly designed...

 

so if the valve is shot, then does that mean you won't get heat anywhere, or just coming through the upper vents?

my car is sans heat right now, but it comes through the vents for the windshield and down at my feet. what's up with that?!?!? is that the whole core or just this valve-thingie?

 

It sounds like you have a problem with the vent selector.

I was going through coolant, so I bypassed the core until it got cold enough to prompt my lazy *** to fix it.

 

Most electronic vent controls have a failsafe that sets it to winter settings (Clear the windshield and melt the snow on your feet) in the event of a failure... It's for safety... Or something...

Not sure about mechanical controls...

Do you have an 84-85 with electronic controls?