temperature sending unit - Team Camaro Tech
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post #1 of 17 (permalink) Old May 19th, 09, 09:22 AM Thread Starter
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Ben
 
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temperature sending unit

Tried this yesterday in engine section,no replies,so thought Id try here.
Late model 350 with 3/8" temp holes in heads,want to retain original 1/2" sending unit. I dont have any 1/2" holes.Can I use the hole on top of the water pump instead of changing out the thermostat outlet neck ??Would that give me an inaccurate reading? Thanks in advance for any help
Ben

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post #2 of 17 (permalink) Old May 19th, 09, 09:58 AM
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Re: temperature sending unit

No holes in the intake? That's where my is mounted...

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post #3 of 17 (permalink) Old May 19th, 09, 12:45 PM Thread Starter
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Re: temperature sending unit

There is a hole in the intake ,butt that is where a heater hose goes. Ben

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post #4 of 17 (permalink) Old May 19th, 09, 12:58 PM
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Re: temperature sending unit

Ben what intake are you using?

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post #5 of 17 (permalink) Old May 19th, 09, 02:08 PM Thread Starter
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Re: temperature sending unit

The intake is a GM replacement manifold to replace a throttle body fuel injection with a four barrel carb.
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post #6 of 17 (permalink) Old May 19th, 09, 11:40 PM
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Re: temperature sending unit

Go to Napa and get a brass 1/2" to 3/8" reducer.

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post #7 of 17 (permalink) Old May 20th, 09, 06:27 AM Thread Starter
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Re: temperature sending unit

Where am I going to put it,will the top of the water pump be accurate?

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post #8 of 17 (permalink) Old May 20th, 09, 06:41 AM Thread Starter
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Re: temperature sending unit

I want to use a 1/2" hole to keep the original sending unit,has only 1 wire and is for a gauge. I would use the 3/8" hole in the side of the head if i could find one with 1 wire and for a gauge.

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post #9 of 17 (permalink) Old May 20th, 09, 07:15 AM
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Re: temperature sending unit

Drill a hole in the GM intake. It's only cast aluminum. It drills very easily. Put thick grease on the drill bit so the shavings won't fall into the motor. Then take a 1/2"NPT tap and tap the hole. The hole on the water pump will not work. Unless you don't want heat in the winter. That hose supplies your heater core and the hose on the intake is the return. The sending unit needs to be in direct contact with coolant so if you use a reducer, make sure it doesn't sit the sending unit back so far that it doesn't make contact with coolant flow. Drilling the intake is so easy. I can't believe it doesn't have a hole already.

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post #10 of 17 (permalink) Old May 20th, 09, 07:28 AM Thread Starter
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Re: temperature sending unit

It does have a hole,but that is where one heater hose goes and the other one goes to the water pump.

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post #11 of 17 (permalink) Old May 20th, 09, 08:18 AM
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Re: temperature sending unit

You might look into opening the 3/8 hole to 1/2 as using an adapter will not place the sending unit into the coolant flow and get an erroneous reading, ie, not hot enough indicated. Plus the 1/2 inch won't fit in a 3/8 adapter.

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post #12 of 17 (permalink) Old May 20th, 09, 09:30 AM Thread Starter
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Re: temperature sending unit

Maybe I could put a tee fitting at on the intake where the heater hose is at??

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post #13 of 17 (permalink) Old May 20th, 09, 01:52 PM
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Re: temperature sending unit

The sending ubit needs to be in the coolant flow to give the correct temperature reading. Out of flow, out of temp zone, too cool will be indicated.

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post #14 of 17 (permalink) Old May 20th, 09, 02:14 PM
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Re: temperature sending unit

Got a picture of the top of the intake?

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post #15 of 17 (permalink) Old May 21st, 09, 07:39 AM
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Re: temperature sending unit

The intake should have a hole on the front passenger side for the heater hose and another hole either next to it or on the other side front to the side of the stat housing. If not, then just drill a hole. It's only cast aluminum. It's easy to drill. Do not use a "T" on the heater hose and do not use a reducer. The sending unit needs to be in DIRECT contact with the coolant flow. The reducer sets the sending unit back too far to have the coolant flowing DIRECTLY over the sender. It will give you a false reading. Each cylinder head has a hole in it. The drivers side head is between #1 and #3 cylinders and the passenger side head is between #6 and #8 cylinders. If you drill the intake, make sure you put a thick grease on the drill bit so it will collect the shavings. Trust me, it's easy as pie to drill the intake. Get yourself a 1/2"NPT tap. It has to be a NPT tap because all NPT holes are tapered. They get narrower the further they go down. On NPT threads and fittings, it's the threads that do the sealing.

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