ChromeVette

I am installing dual radiator mounted fans in 76 and wanted to know options for installing the temperature switch.

Edelbrock intake manifold drivers side port is sending temp to gauge in dash so want to keep that. No other intake ports available on manifold. There is a type of water neck with an emissions port if needed for that year. Since I don't need that water neck port for emissions can I put the radiator fan switch in the water neck port?

Any other ideas where to put the screw in temp unit for the fans would be great.

Thanks

Kacyc3

I dont like the idea of it after the t stat just seems liek your asking for problems. I would put it in the the head, or move you gauge to the head and the fan in the port the gauge was using.

gungatim

another option is to use the temp probe that goes in the radiator hose. no screw in fitting needed. just slip it in the hose past the radiator neck and re-clamp the hose. the thin capillary feed tube is so small the hose seals just fine around it. that is what I use on my '68, they are around $25 and work great

bashcraft

What kind of problems?

gungatim

I am guessing another alternate theory of thermal dynamics maybe?

REELAV8R

I'm curios too, what problems?

Op, you can get a upper radiator to block housing that has a port just for a temp sensor.

http://www.speedwaymotors.com/Chrome...d-GM,7686.html

Also if the top port on your water pump is not in use and has a plug as most SBC's have, you can get a size adapter to size it down to a temp sensor.

They also have inline radiator hose sections that have a temps sensor port in them. This one is a bit spendy but you get the idea.

http://www.autoanything.com/coolers/...sensor-adapter

Kacyc3

tstat not opening never turning on the fan.

REELAV8R

If the tstat does not open then the water is not going to flow and the engine will overheat, regardless of whether the fan is running or not.

cv67

Plenty of guys use that for a temp switch
ck for areas in the cyl head also not sure the block itself is a great idea

20mercury

Same question for me as original poster, this sounds like a great fix, who sells them?
Thanks.

Cool bean

I'm in a similar situation with installing dual fans. I'm guessing you might have the stock heads, but I have aftermarket aluminium heads and am putting a temperature switch in each head. (I'm installing a hi and low fan speed set up, so two switches needed for my application), i dont have a port in my water pump.
Similar to you, I'm putting the temperature sending unit in the manifold. The issue I'm running into is the water neck angled instead of straight, and I'm not sure the temp sending unit will fit under the hose when its attached. I need to figure out how to solve that; i might need a straight water neck and related hose, or other solution. So your question and the replies are very helpful!

BlackC3vette

I've used that type and it works just fine. Also, the temperature of the coolant is being read at its highest point before it enters the radiator.

mikem350

But why does somebody always say.."what if the thermostat never opens?"

I am TIRED of hearing this misconception..as said when the coolant gets HOT the thermo WILL open...and your sensor will work.

REELAV8R

Just a misunderstanding of how the cooling system works.
If the thermostat fails to open on a engine with a fan fixed to the water pump pulley is it going to run cooler because of the fan? Nope.

noonie

Such a simple concept. Two separate systems working together.

The tstat regulates the engine temp.
The tstat opens more to adjust the flow of coolant.

The radiator regulates the coolant temp, with a fan when needed.
If the radiator needs more airflow to reduce the coolant temp, it turns on the fans by sensing the radiator output (coolant too hot).

Same way ecm fans are presently controlled.

dmruschell

I have my 79 with dual fans set up this way. It works just fine.

gungatim

I got mine at automasters, a local parts store/hot rod shop. in the section with all the aftermarket fans/cooling stuff.

I think it is the same as this one:

https://www.etrailer.com/Accessories...le/D16769.html

on/off temp is adjustable, and you can locate the pot anywhere out of the way, the line is like 3' long.

ChromeVette

Just wanted to follow up on my original post. After doing some research and your comments I decided to put the dual fan temp switch into the cylinder head port. I had to get an adapter to fit the port size in the head.

I used the driver side port vs. the passenger rear port as I read that there is a heat difference from front to back ports.

I'll know soon enough when it fires up!!!