Heater core quick release fitting - Need Barb Info

[Matt Bachand]

Going to order my 1 piece 3/8ths barbed T for FTB,

And figure I'll get the fitting to replace the Quick release too. Last time I undidd that it weeped. HOpefully no issues.

I can't find the threads with this info though.


Can anyone tell me the size of barb to get so that it threads into the t-stat housing, and then I put 5/8 heater hose?

Thank you.

 

[Matt Bachand]

If I am not mistaken what you are talking about is the famous coolant crossover connector. You need 1/2" NPT tap to clean it out. You should be fine. The replacement that the store sell now is made out of steel instead of porous metal. Or you can use 1/2" NPT to 5/8" barb connector in place. GM has a part no. that actually have the orifice in it.


Quote from JMJNet.... Found it!

 

[Matt Bachand]

http://www.plumbingsupply.com/barb.html

Is that the same as 5/8" barb x 1/2" Mips??

 

[Tookie]

Can anyone tell me the size of barb to get so that it threads into the t-stat housing, and then I put 5/8 heater hose?
.

If I am not mistaken what you are talking about is the famous coolant crossover connector. You need 1/2" NPT tap to clean it out.

Answering yourself now, Matt?:smile5:

 

[JiFaire]

From the 6.5TD Technical Reference Library - found it with my phone, cause I'm on the road...

Heater Hose Quick Connect Barbed Fitting 99 OEM – 15963984, AC Delco - 15-30569

http://www.thetruckstop.us/forum/showthread.php?t=629

both GM and NAPA make steel ones with the office in them.

 

[NVW]

Answering yourself now, Matt?:smile5:

That's what I thought

 

[Matt Bachand]

LOL I re-read it and it seems that way!

I think NPT and MIPS are the same....

for 3 bux I ordered one up along with my T Barb Fuel pressure gauge after I FTB.

 

[bk95td]

I put a new napa quick connect on my 95LD. It leaked worse than the old one. Then I went to a pipe to hose nipple with the restriction like my 91 6.2 had on it. Napa#660-1732. No leaks now.

 

[Turbine Doc]

Some will swear that the restrictor is necessary, I have just a straight nipple on my burb & truck, possibly the restriction from 1/2" IPS to 5/8" barb is all restriction that is required for Southern USA.

 

[Matt Bachand]

Some will swear that the restrictor is necessary, I have just a straight nipple on my burb & truck, possibly the restriction from 1/2" IPS to 5/8" barb is all restriction that is required for Southern USA.

Your hotter than me, so I'm not worried.

If my heater core blows out, then it was going to sooner or later, right? What better time than now...

 

[NVW]

Some will swear that the restrictor is necessary, I have just a straight nipple on my burb & truck, possibly the restriction from 1/2" IPS to 5/8" barb is all restriction that is required for Southern USA.

x2

It was all I could get in a bind and I had plans to replace it with a proper nipple. That was over 2 yrs ago.:smile5:

 

[bk95td]

I thought the idea of the restriction is to slow down the flow to the heater core so it has a chance to shed some heat. Too fast and the heat cant get out just the same as no thermostat. Or am I way off base?

 

[ak diesel driver]

And here I thought it had to do with balancing the flow from side to side.

 

[3500GMC]

And here I thought it had to do with balancing the flow from side to side.

That's a good thought. For better or worse, my '93 is set up with just a barb and 5/8. Sans quick connect.

 

[Matt Bachand]

And here I thought it had to do with balancing the flow from side to side.

I think you are referring to a restricting oraface that is on the waterpump itself?

If you decrease the size of the oraface, I'm not sure you are slowing down the coolant at all, just restriction how much goes through it. The pressure should remain the same?...

 

[GJF]

The restrictor just limits the coolant flow to the bypass . And push the heat to through the radiator to let the fan clutch work more efficiently by being able to sense the heat from the radiator rather than all the heat in the heads, and make a more stable heat management. Yes pressure is not affected.