1993 Pontiac Grand Am Hose Fitting

Tiny
HEROAT LARGE
  • MEMBER
  • 1993 PONTIAC GRAND AM
  • 6 CYL
  • FWD
  • MANUAL
  • 180,000 MILES
On the 1993 3.3L engine, what is the thread size of the water inlet plastic hose fitting, on the intake manifold.
Is it a 1/4 - 18 NPT w/ a 5/8 hose barb?
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Saturday, August 15th, 2009 AT 10:13 AM

7 Replies

Tiny
MMPRINCE4000
  • EXPERT
Remove it and match it up at any autoparts or hardware store. Most water fittings in U.S. Cars are NPT pipe fittings.
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Sunday, August 16th, 2009 AT 9:07 AM
Tiny
HEROAT LARGE
  • MEMBER
The water fitting going into the air ilet manifold is a 3/8 NPT x 5/8 hose. Now try and find one on a weekend.
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Tuesday, August 18th, 2009 AT 8:29 AM
Tiny
MMPRINCE4000
  • EXPERT
Sorry for the incomplete answer, I thought you could measure the diameter of the hole, since there is a big difference between 1/4 NPT and 3/8 NPT.

You can usually find these at hardware stores in brass or steel.
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Friday, August 21st, 2009 AT 9:12 AM
Tiny
HEROAT LARGE
  • MEMBER
There is a big difference between the and 3/8, but with only the alternator removed, I gained access to the port but not clear access. After measuring the hole, I erred towards the smaller but after chasing the thread, it still didn't feel quite right. After removing all the other equipment and then jacking up the motor I could see that I had actually only cut a thread into the broken fitting.

The only fitting I could find on the weekend was a 3/8NPT by hose. The difference in the hose was made up by using epoxy and double clamping. Epoxy is the king of emergency repairs - duct tape the prince.
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Friday, August 21st, 2009 AT 1:08 PM
Tiny
MMPRINCE4000
  • EXPERT
Glad you got it working, and again, sorry for not giving you a more informative answer.
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Saturday, August 22nd, 2009 AT 9:36 AM
Tiny
SWNEIGHBOURS
  • MEMBER
I'm having the same issue on the same make, model, year, and engine car. What store did you find the connector at and what did they call it? I went to Auto Zone tonight and they didn't have anything like that.
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Wednesday, August 26th, 2009 AT 9:58 PM
Tiny
MMPRINCE4000
  • EXPERT
Hardware stores usually carry brass NPT fittings with barbed ends.
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Thursday, August 27th, 2009 AT 7:44 AM

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