Heating matrix pipes diagram

[GeorgeT]

Hi, just wondering if anyone had a 1991 sunbird heater pipes diagram, been looking on Google and not found anything. Thanks in advance

 

[melsg5]

Just to be clear, you mean pipes, not vacuum hoses?

 

[GeorgeT]

Just to be clear, you mean pipes, not vacuum hoses?

Yes the pipes themselves I was told they’re the ones that carry the water

 

[92 Sunbird LE]

Let me check my service manual...

Doug in P.R.

______________________________

 

[GeorgeT]

Thanks that’d be great

 

[92 Sunbird LE]

Best I can do out of 3 books, my hoses are looped due to the plastic ends of heater inlet/outlet tubes are plastic and are broken off and nothing to attach to anymore...don't need a heater where I Live...

Doug in P.R.

 

[GeorgeT]

Best I can do out of 3 books, my hoses are looped due to the plastic ends of heater inlet/outlet tubes are plastic and are broken off and nothing to attach to anymore...don't need a heater where I Live...

Doug in P.R.

Thanks Doug, that should be enough to go on, thanks for your help

 

[GeorgeT]

I’ve manage to have a look at the heater hose outlets, and yes one is broken, I’m hoping it’s on of the heater core ones so it’s not a full centre dash removal. Would you guys be able to tell me whether it is from the heater core. There are three in the shape of an L like below:
O O
O
The top left outlet is broken. And the top right has been bypassed. Is the broken one part of the heater core?

______________________________

 

[92 Sunbird LE]

Picture would help....shine a light or flash....

Doug in P.R.

 

[GeorgeT]

Yeah I tried this is the best I got even from underneath the car I couldn’t get my phone in to a photo, I’ll try and get another picture soon

 

[GeorgeT]

I drew it, can’t get a good enough photo with the storm going, probably be easier to understand anyway

 

[melsg5]

Any heater core has only two heater hoses connected to it. Anything else is your AC system going to the evaporator core, two pipes.

______________________________

 

[92 Sunbird LE]

I'll try tomorrow morning to put mine up on ramps and see underneath and try to get a pic, can't see anything from the top plus the rack leaked all over the firewall...( Lord knows it needs it cause it's a rust bucket)

Doug in P.R.

 

[GeorgeT]

Thanks, yeah I just need to figure out which two are the heater core to make sure that’s what needs replacing

 

[92 Sunbird LE]

Closer to the drivers side under the brake booster, where the inner tie rods attach to the rack and pinion... passenger side is the a/c lines and drain..

 

[GeorgeT]

if they weren’t connected/ bypassed would this stop the heater from working?

______________________________

 

[92 Sunbird LE]

Yes....

 

[92 Sunbird LE]

A/C lines and rubber drain Passenger side

 

[92 Sunbird LE]

Either the core was leaking or the plastic ends broke off like in my case , all the new replacement ones are all brass like the old days..

Doug in P.R.,

 

[92 Sunbird LE]

YouTube video on heater core replacement for a early 90's Grand Am ....close enough for a procedure...

Doug in P.R.