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Author Topic: how to check a coolant sensor  (Read 1606 times)

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Offline sportpig

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how to check a coolant sensor
« on: June 05, 2013, 01:27:51 PM »
can someone throw a test light on the coolant sensor with the key and tell me if is supposed  ???to have power
« Last Edit: June 05, 2013, 11:32:00 PM by Whuntmore »

Offline mudkicker715

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Re: 5 seconds of your time
« Reply #1 on: June 05, 2013, 02:36:13 PM »
No power. resistance

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Offline sportpig

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Re: 5 seconds of your time
« Reply #2 on: June 05, 2013, 02:41:15 PM »
Ok tell me what i need to do here to see what the problem is

Offline eaglebeek

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Re: 5 seconds of your time
« Reply #3 on: June 05, 2013, 10:04:56 PM »
Ok tell me what i need to do here to see what the problem is

OK....take  the wire that was connected to the sender and touch it directly to the engine. Have someone tell you what the temp gauge is doing.

When the wire is touching the block the gauge needle should go all the way to the top.

If the needle moves your sender on the block is bad. If it doesn't move you have a wiring problem or the gauge is bad. :eagle: :eagle:
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Offline sportpig

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Re: how to check a coolant sensor
« Reply #4 on: June 06, 2013, 08:03:14 AM »
Alright. ill check back later n get back with ya. thank you

Offline sportpig

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Re: how to check a coolant sensor
« Reply #5 on: June 06, 2013, 03:09:02 PM »
Well at one point a week ago the needle instantly pegged. now before i trid your idea it was at cold. i turned on ignitio and it bottoms out immediately . i tried you trick and it immediately bottomed out again as it did. i did notice by accident i had a 25 amp fuse i stuck in there instead of a 7.5on accident . il was the same color my bad. did i just flat out destroy the gauge? That's what I'm thinking

Offline eaglebeek

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Re: how to check a coolant sensor
« Reply #6 on: June 06, 2013, 09:52:01 PM »
Well at one point a week ago the needle instantly pegged. now before i trid your idea it was at cold. i turned on ignitio and it bottoms out immediately . i tried you trick and it immediately bottomed out again as it did. i did notice by accident i had a 25 amp fuse i stuck in there instead of a 7.5on accident . il was the same color my bad. did i just flat out destroy the gauge? That's what I'm thinking
I wouldn't think so. I think that fuse protects the entire dash display...fuel gauge, clock, tach if equipped, etc.

A new sender in the block is not that expensive. I'm still thinking that's what went bad. I know NAPA has it, and I suspect the others have it also. It's not that hard to install, and you don't have to drain the radiator. Have your new sender ready in hand and the threads wrapped with teflon tape or coated with pipe joint compound. Remove the old sensor with a cold engine, immediately insert your new sensor and screw it in. :eagle:
1984 Eagle Wagon, 258, auto, 2.73 gears, daily driver
1983 Eagle Limited Wagon, new arrival from way up north
2000 Jeep Cherokee, 4.0, auto
2007 Hyundai Accent, radical downsize from minivan, wife's car and she loves it!

"The society which scorns excellence in plumbing as a humble activity and tolerates shoddiness in philosophy because it is an exalted activity will have neither good plumbing nor good philosophy: neither its pipes nor its theories will hold water."--John W. Gardner, in "Excellence: Can We Be Equal and Excellent Too?" (1961)
 
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Offline carnuck

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Re: how to check a coolant sensor
« Reply #7 on: June 06, 2013, 10:19:36 PM »
That's also the proper way to bleed the air out of your motor if you drain/fill the system or steam pockets will keep forming at the top. Your gauge will also misread if the casting goes down further than the bottom of the sender which traps the air in unless you get your car pointing straight up!
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Offline sportpig

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Re: how to check a coolant sensor
« Reply #8 on: June 07, 2013, 03:51:33 PM »
Well the gauge works. i pulled it out and ran pon neg to it. i tried looking at the wire diagram here and i have a green black wire going to the sensor .  i wired in a new fusr block cause it was melted as :censored:. the block came out of a concord so most wires were diff colors. i ended up with 2 beige wires which i connected as well as a snipped green black u found on the pigtail that's on the bottom of the box that has some 2 prong black plastic fuse thing with 2 terminals on it ?

Offline sportpig

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Re: how to check a coolant sensor
« Reply #9 on: June 07, 2013, 03:53:55 PM »
Fuel gauge seems to be working. I'm going to gas can it up n c if the gauge goes up to verify.

Offline mudkicker715

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Re: how to check a coolant sensor
« Reply #10 on: June 07, 2013, 03:59:03 PM »
I would doubt that a higher amp fuse has anything to do with your gauges. the sensors are a measure of resistance. nothing to do with voltage. unless somthing unrelated to the original problem happened should be good.

Current amc's
82 concord waggy 258 DD
84 eagle sedan stroker DD
86 eagle wagon sas 304 v8 toy
87 eagle wagon stroker

Manitowoc WI