Temp Too Low???

AJ/FormS said:

If you installed a sensor into the WP, you must have drilled and tapped a hole for it, as the stock WPs have no such port.

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Sorry, should've mentioned its a replacement water pump, I figured it didn't matter because its just a generic NAPA part, factory replacement. I'm running an equus gauge, since the only factory gauges that have ever worked on this car are the speedo and the volt meter. The main reason I havent used the factory gauges is convenience, I got a temp, fuel and oil temp gauge in a box when I bought the car, so I've just been slowly installing them on the car as I've needed, because hey, I'm not paying any extra.

toolmanmike said:

So frustrating trying to diagnose things over the Internet without pictures.

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Hope this helps, sorry, I don't have access to the car at the moment, just trying to get some research done while she's out of my hands. I dont have any pictures of the engine with the sensor attached, but I have it routed through that blocked off point on the pump. Circled in red there

Ok, this is an early 70's small block 318 intake and the red lines show the possible locations for a temp sender.
Senders can vary in size also, so first you want to locate a threaded opening that fits your sender unit and is as close to the thermostat as possible.
On The Wifes 72 Dart I had to drill and tap an existing 1/4NPT hole to 3/8 NPT so I could use the larger mechanical temp sender in the OE electric sender hole, because the electric sender for the idiot light was smaller.
Sure, I could have gotten adapters to eventually put the 3/8 sender on the 1/4 inch port, but it would have been so far away from the coolant flow it would be worthless.

Basically any one of the ports in this picture with the red lines could be used.
Remember, the closer to the thermostat the better and you don't want adapters if there is any possible way to avoid it.

On most manifolds, anything forward of the first high spot on the intake (runners) is going to be coolant and any holes on the back are going to be vacuum ports.
Some intakes, like the one on the Wife's car I had no choice but to drill it and tap to a bigger size because there was only the one small port available.

TrailBeast said:

Ok, this is an early 70's small block 318 intake and the red lines show the possible locations for a temp sender.
Senders can vary in size also, so first you want to locate a threaded opening that fits your sender unit and is as close to the thermostat as possible.

Basically any one of the ports in this picture with the red lines could be used.
Remember, the closer to the thermostat the better and you don't want adapters if there is any possible way to avoid it.

On most manifolds, anything forward of the first high spot on the intake (runners) is going to be coolant and any holes on the back are going to be vacuum ports.
Some intakes, like the one on the Wife's car I had no choice but to drill it and tap to a bigger size because there was only the one small port available.

View attachment 1715017401

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The motor was advertised as a 69, should've mentioned that too initially I realize, but I didnt realize there is much difference between the two. Thanks for the picture, it tells me exactly what needs to happen

Ok, so your motor looks almost identical to my Wifes motor with the small hole and sender right where the green circle is.
This would be where the idiot light sender is.
If you want to keep the intake and don't want to drill and tap it. then they make a spacer that goes between the thermostat and thermostat housing about an inch thick and has holes for temp senders already in it.

Meziere WN0028B: Thermostat Housing/Water Neck Spacer Small Block & Big Block Chevy / Big Block Chrysler | JEGS

Thats super rad. I'd rather grab that spacer, since I'm planning on a 4bbl swap in the near future, that part will move right over when I swap

68Valiant225 said:

Thats super rad. I'd rather grab that spacer, since I'm planning on a 4bbl swap in the near future, that part will move right over when I swap

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Where exactly in those pictures do you have the temp sender.

Yes, I'm old, and yes I can't see too good but dayum I don't see a temp sender.

yellow rose said:

Where exactly in those pictures do you have the temp sender.

Yes, I'm old, and yes I can't see too good but dayum I don't see a temp sender.

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There isn't a sensor in the picture that I posted, I circled the blocked off opening where the sensor is currently, the only picture I had available was before I installed it