[HO455]

I scored some stuff off of a 67 Burban at 205 Auto Wrecking. One of them was an early thermostat housing spacer with the bypass hose. With some help from some friendsI removed the bypass hose fitting and modified a 3/4" to 1/2" bushing to maximize the amount the sensor would protrude into the water flow. Then I installed my existing sender on it and put the sender I got from the wrecking yard in the water neck. I can now compare the difference between the senders below the thermostat and above it. And after a couple of days of switching back and forth I find the sender below the thermostat reads noticeably lower than the one above. Admittedly the lower sender is not in the middle of the water flow but it isn't shrouded by the housing. But even in stop and go traffic it never gets anywhere near the same reading as the upper sender. (The same sender used to read higher when it was installed above the thermostat before I put the spacer in.) The upper sender stays low until the thermostat opens then it jumps up and stays pretty much steady after that. The last photo is of the before set up on the old motor.