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Old 12-05-2006, 02:14 PM   #1 (permalink)
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Water Thermo sensor

i have an 86 22re pickup and i just rebuilt the top end. during the process of taking plugs and hoses off i accidently broke a sensor. in the haynes repair book the sensor is called a " water thermo sensor. " I went to napa and they had no idea what i was talking about. I went to advanced auto parts and they found a sensor that looked like it but the price was $167.00. i thought the price was to hight and decided not to buy it. My truck runs fine with out it but the temperature fluxuates. i have been told that the reason it fluxuates is because of an air bubble in the system some where. when i pop the hood i look the big hoses running to and from the radiator ( top left and bottom right. ) the hoses dont have any pressure in them and before the rebuild i remember that there was some pressure in the hoses. I thought that the water might not be circulation but i have heat in the cab. i was wondering if any body knew of a place to buy this water thermo sensor and if
not having it plugged in could be causing my temperature to fluxuate.
any help would be nice. thank you
also when i popped the hood the big hose on the top left was sucked together and when i opeded the radiator cap it sucked back to normal

Last edited by chipmcod; 12-05-2006 at 02:16 PM.
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Old 12-05-2006, 02:57 PM   #2 (permalink)
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Are you talking about the sensor named in blue below?
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Old 12-06-2006, 09:36 AM   #3 (permalink)
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I believe I have one to a 1986 and I'll make you a deal on it.. I'd like to confirm that the connectors are the same... PM or email me.
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Old 12-06-2006, 10:43 AM   #4 (permalink)
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Quote:
Originally Posted by 4runnerx3
Are you talking about the sensor named in blue below?
yes its the one that is blue. could missing it be causing my problems
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Old 12-06-2006, 10:45 AM   #5 (permalink)
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Quote:
Originally Posted by chipmcod
yes its the one that is blue. could missing it be causing my problems
It won't cause issues with your temp gauge. A different sensor is used for that.
You probably have air bubbles in your coolant - see 4crawlers website.

It will impact how your truck drives. That sensor tells the ECU when to add fuel and when to lean it out. You need to replace it.
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Old 12-06-2006, 02:47 PM   #6 (permalink)
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The ECU receives signals from various sensors indicating changing engine operation conditions such as...

Intake air volume-air flow meter
Intake air temperature- air temp sensor, inside air flow meter
Coolant temperature- water temp sensor for ECU
Engine rpm
Acceleration/deceleration
Exhaust oxygen content
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Old 12-07-2006, 03:19 AM   #7 (permalink)
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The sensor has a part number on it on the brass part if it hasn't been chewed up. VatoZone has the part mislisted. If you take them that part number they should be able to use that number to cross reference it. That's what I had to do when I needed one.
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Old 12-07-2006, 12:46 PM   #8 (permalink)
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Just bought a water temp sensor for my 85' (don't imagine its any different then the 86') the other day for $17.
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Old 12-07-2006, 01:05 PM   #9 (permalink)
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Just remember there are 3 things that could be "confused" as a water temp sensor:
1) The water temp sensor for the temp gauge, top of the lower plenum, near the head.
2) Water temp sender - green, at the end of the lower plenum.
3) Cold start sender - functions the same way - brown - end of the lower plenum.
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Old 12-07-2006, 03:34 PM   #10 (permalink)
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Not to hijack this post but i have the carbed version and have the same problem finding which temp sensor to use for the gauge.
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Old 12-07-2006, 09:12 PM   #11 (permalink)
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the water temp sensor for the dash gauge is on the thermostat housing on models up to 86, then they moved it on the intake between #2 and #3, I think.
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Old 12-07-2006, 09:30 PM   #12 (permalink)
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I bought a replacement for about $40 at the dealership. It took a shit and the truck was WAY too rich. Black soot was coming out of the exhaust

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