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Thread: Where to place cts

  1. #1
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    Where to place cts

    I was looking around today and realized i have nowhere to put my cts. I have a pipe plug in my thermostat housing and in my water pump. Could i buy an adapter to install the cts in one of those places. I know you need to make sure the cts has a flow of coolant over it. Is there anything i am overlooking. Motor is a non emissions sb350 with carb intake in a 78 k20

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    Fuel Injected! brian617's Avatar
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    Thermostat housing is bad idea as it will only get coolant flow after stat opens. Hole in water pump bad idea too as that is return coolant that has already dissipated heat via heat core. Best location is in coolant crossover at front of intake, or even "T'd" in heater hose fitting leaving manifold to heater core. Some of those carb manifolds have a boss for drilling and taping to fit CTS.
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    Quote Originally Posted by brian617 View Post
    even "T'd" in heater hose fitting leaving manifold to heater core.
    the 2.3 ranger used this type of setup..... it's not my favorite way of acquiring coolant temp data, but it is one of the least invasive ways of going about it. as long as you don't suddenly have a plugged heater core, it should be accurate enough since the rubber lines won't dissipate too much heat.
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    I've seen thick spacer plates you put under the thermostat that can take a CTS sensor through the side.

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    Whatever you do with a "T", make sure the CTS is sitting very deep in the "T". If you just get the tip of CTS in flow it is not accurate.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
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    I dont have a boss to drill and tap in the intake manifold and a spacer under the thermostat housing is no good. Home depot here i come. Maybe i can rig up a (t). Another thing i should mention is my tbi adapter is from a 454 that has coolant running through it. Their is a pipe plug on the side but i would need an adapter. Also i am missing one of the outlets for the hose on the adapter.

  7. #7
    Super Moderator Six_Shooter's Avatar
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    What engine is this?

    Post a few pictures.

    NEVER EVER EVER put a CTS in the thermostat housing, the ECM will HATE the sudden change in temp when the thermostat opens.
    Last edited by Six_Shooter; 06-06-2014 at 05:44 AM.
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    Fuel Injected! JeepsAndGuns's Avatar
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    I have mine in a "T" coming off the rear of the intake going into my heater core. It has been there since I first switched to fuel injection. Its been there with my old 7747, and my current 7427. Never had any issues.
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

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    Fuel Injected! brian617's Avatar
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    Quote Originally Posted by Six_Shooter View Post
    NEVER EVER EVER put a T-stat in the thermostat housing, the ECM will HATE the sudden change in temp when the thermostat opens.
    I almost always put a T-stat in my thermostat housing
    89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
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  10. #10
    Super Moderator Six_Shooter's Avatar
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    Quote Originally Posted by brian617 View Post
    I almost always put a T-stat in my thermostat housing
    oops...
    The man who says something is impossible, is usually interrupted by the man doing it.

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    I had this same question and had a thread a few months ago. I had mines in the thermostat housing and it made the idle stay high until the t-stat opened as it was trying to get the car up to temp, And then it'll quickly drop down idle speed when it opened. It also messed with my car going into closed loop.

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    Gotta remember there's no flow of water in the T stat housing! Well not until it opens. The CTS needs a constant flow of water always so it knows when it's cols and what the temp is as it warms up. If you look at a TBI intake and where the CTS is... it's in a constant flow of water and when that water get's hot enough the T stat opens.

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    some pics
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    Fuel Injected! JeepsAndGuns's Avatar
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    Something interesting. Take a look at a Jeep 4.0, they have their CTS in the thermostat housing. BUT, the outlet for the heater core is also on the t-stat housing, and that is the part of the housing the CTS is located at. It gets the constant flow of coolant as it goes out of the engine into the heater core. So basicly its inline with the heater core.

    Is that the outlet for the heater core to the left of your t-stat housing? If so, it looks like it has a thread in fitting. Simply remove it, and place a T between it and the intake
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

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    Is there no threaded bung hole to the drivers side of the thermostat outlet? Most manifolds seem to have at least one threaded hole somewhere on the front coolant crossover.

    Why can't you fit something like this under the thermostat?

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