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Unread 07-15-2013, 07:46 AM   #1
BassMasterCHS
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Aftermarket Coolant temp gauge

The 88 block has a temp sensor on the drivers side of the block. Could I use that spot for a coolant temp sensor?

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Unread 07-15-2013, 08:29 AM   #2
djb383
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U can use virtually any location where the tip of the sending unit is in flowing coolant. Obviously the male/female threads must match. The problem with a sending unit in the block is the block is where cooled coolant from the rad 1st enters the motor. Usually, a temp gauge sending unit is located close to where coolant exits the motor vs where coolant enters the motor. Coolant temps vary all throughout the block and head......cooler where it enters the motor, hotter where it exits the motor.
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Unread 07-15-2013, 08:34 AM   #3
BassMasterCHS
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If that's the case, why did they put the gauge sender on the back of the head? Where would you recommend putting the sensor?
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Unread 07-15-2013, 08:46 AM   #4
djb383
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The back of the head is the factory location ('96 down, t-stat cover '97 up) and factory gauges r purposely rigged to display +/- the middle as long as coolant temp is within normal factory engineered parameters. Usually, any part of the head will be hotter than the block. Cooled coolant flows into the front of the block, to the rear of the block, then up and into the rear of the head and out the front of the head. An aftermarket gauge/sending unit isn't "rigged", they just tell it like it is, which probably means it will display cooler temps if the sending unit is in the block vs the head.
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Unread 07-15-2013, 08:55 AM   #5
BassMasterCHS
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I wonder what temperature I need to look for with the aftermarket temp gauge if I do put it in the side..
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Unread 07-15-2013, 09:04 AM   #6
djb383
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That's the $64,000 question. I would rather know coolant temp on the hot end (exit).

Two gauges, one monitoring upper rad hose temp and one gauge monitoring bottom rad hose temp, would be interesting.
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Unread 07-15-2013, 09:08 AM   #7
BassMasterCHS
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Quote:
Originally Posted by djb383 View Post
That's the $64,000 question. I would rather know coolant temp on the hot end (exit).

Two gauges, one monitoring upper rad hose temp and one gauge monitoring bottom rad hose temp would be interesting.
Certainly would. Hmm.
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Unread 07-15-2013, 09:19 AM   #8
BassMasterCHS
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I have the heater hoses looped together, think I have enough flow to put a sensor there?
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Unread 07-15-2013, 09:32 AM   #9
djb383
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The heater hose that has coolant that exits the motor is a excellent location.
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Unread 07-15-2013, 09:40 AM   #10
BassMasterCHS
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Just a matter of finding a T with 5/8 barbs and 3/8 thread...
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Unread 07-15-2013, 09:40 AM   #11
BassMasterCHS
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Ace hardware is a strike
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Unread 07-15-2013, 09:45 AM   #12
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Scratch that, I got the parts i need to make it
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Unread 07-15-2013, 10:08 AM   #13
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I redrilled mythermostat housing for 1/8" pipe thread to accept a second sending unit, a VDO electric. Not ideal as it is post-thermostat. I also have a tap in the upper radiator hose of my Wrangler. Again, not ideal but it works. The new engine is going to have one in the tank of the radiator under the inlet and I am looking for a good spot to put one pre-thermostat in the head. In the event I don't find anywhere better, the thermostat housing will keep my sender.
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Unread 07-15-2013, 12:43 PM   #14
djb383
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Quote:
Originally Posted by BassMasterCHS View Post
Just a matter of finding a T with 5/8 barbs and 3/8 thread...
I thought the big heater hose, the one with coolant exiting the motor, was 3/4". Tip of sending unit needs to extend into flowing coolant as far as possible. Coolant flows thru the heater hose the moment the motor starts vs the upper rad hose that has virtually no/very little flow thru it until stat opens or stat is drilled.
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Unread 07-15-2013, 01:41 PM   #15
BassMasterCHS
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Okay, some confusion here. I'm talking about the 5/8 hose that comes off the t stat housing that runs to the heater core. Not the larger 3/4 hose that runs to the upper rad...
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