I replaced the heater core and bypass valve this past week. I'm glad I did because the heater core was bypassed when I purchased the car so I assumed it was leaking. My assumption was confirmed once I finally got the old core out.

I thought I have all the hoses hooked up properly and I confirmed that the vacuum hose was moving the bypass valve. I am not getting any heat at all.

Can someone take some pictures of the routing of the hoses. One thing I noticed is the radiator has a cap over a barb on the upper passenger side. Does a hose need to go to this?

Please help!!

 

 

That pic TTOP350 posted above of the non-A/C V6 is my original...

I don't know if I posted this one before though... This is the one you seek.

 

Interesting that the V6 with no AC has no heater control valve . Obviously , the heater core must get hot all the time . Now I wonder , In the summer , wouldn't the always hot heater core raise the temp in the car even if there was no air blowing over it ? Even being boxed in and with the control set to off , the still 220 degree heater core would make at least the dashboard itself roasting not , yes ?

 

is there a diagram for a tbi motor?

 

TBI would be the same as TPI except hose #3 is longer and goes to the intake manifold back by the distributor.

 

[QUOTE=Drew;6098015]TBI would be the same as TPI except hose #3 is longer and goes to the intake manifold back by the distributor.[/QUOTE

is that the hose that allows the coolant into the valve?

 

I'm trying to look up that hose but cant find it? anyone know whats its specifically called or a part number?

 

GATES 18911 ACDELCO 16097M DAYCO 87718

Valve To Intake Manifold; TBI; w/ Air Conditioning

Look under heater hoses, it'll be the long one shaped like an S.

 

drew you are awesome. thanks for this reply. now that I'm doing the heater core I need this hose. I went to orileys andthey had zero clue without a part number. I'm headed there now to pick up the heater core and I can order this hose for later today.

 

Glad to hear that info in older threads still comes in handy!

 

Interesting that the V6 with no AC has no heater control valve . Obviously , the heater core must get hot all the time . Now I wonder , In the summer , wouldn't the always hot heater core raise the temp in the car even if there was no air blowing over it ? Even being boxed in and with the control set to off , the still 220 degree heater core would make at least the dashboard itself roasting not , yes ?

Nobody answered this question. I am wondering also.

 

Yes, it does. Most cars never had one at all, the heater control valve was a fairly new thing coming in around 1988? on these cars. (correct me if wrong). Even when closed to the heater core it will still let some coolant through it into the core.

 

Thanks for answering.
So should I add a HC valve to my 84, or not worth it?

 

Honestly not being contradictory or a know it all here , but my cars going back to my 51 Plymouth and my 53 Buick had heater control valves to shut off the hot coolant to the heater core when the heater was not on , and neither of those had AC . I really am surprised to learn that anything as late production as a 1980s car didn't have one seeing how both of my 1950s cars did .

PS , since my Firebird has AC , yes I do have the heater control valve , which I seem to replace every few years due to the wonderful made elsewhere stuff that lasts one month beyond warranty if your lucky ....

 

My 84 TA also came with AC (which I am removing), but did not come with this valve.
If it will fail as often as you say, then forget it.
But I have modified my intake manifold to take the coolant going to the heater core from the rear ports, instead of the passenger front port at cylinder #2, just like my 95 GMC K1500 truck (5.0L TBI). I did this for more uniform cylinder temperatures.
I never even noticed warm air coming from the vents in the past, so it should not be a problem when I get this thing on the road again.

 

Right, some of the older stuff did have that buuut I was mostly speaking of the f-body/3rdgen platform.
I'm not sure what caused them valve to disappear and reappear on various car lines though the years.