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Coolant Temp Sensor Test? by HummelHund
Started on: 08-02-2001 02:53 PM
Replies: 4
Last post by: 87GTZ34 on 08-02-2001 05:13 PM
HummelHund
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Report this Post08-02-2001 02:53 PM Click Here to See the Profile for HummelHundSend a Private Message to HummelHundDirect Link to This Post
I looked in the archives but couldn't find the answer to this question. Is there any way to test and see if the coolant temperature sensor is operating properly? I have an '84 SE 4 cyl. that's been idling rough and high while it's warming up, and the CTS is the only sensor I haven't replaced. I know it's only $8, but if there's a way to test it it'd save me a trip to AutoZone.
Thanks for any help y'all can give me.

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Sean W.
'84 SE 2M4 WS6, The "Buzz Bomb". (restoration project to become daily driver)
'84 Sport Coupe, The "Black Wedge of Death" ($150 running car)

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Leadfoot
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Report this Post08-02-2001 04:41 PM Click Here to See the Profile for LeadfootSend a Private Message to LeadfootDirect Link to This Post
At 100F your sensor should have a resistance of 1400 ohms, and at 260 it should be 55 ohms. Test the sensor with a thermometer. To test the gauge in the cluster just jumper the wire that goes to the sensor with the appropriate resistors (i.e. use resistances above). Hope this helps.
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Leadfoot
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Report this Post08-02-2001 04:45 PM Click Here to See the Profile for LeadfootSend a Private Message to LeadfootDirect Link to This Post

Leadfoot

828 posts
Member since Jun 2001
Sorry for the double post but what I wrote before was for the temp gauge and not the sensor. To test the temp sensor (goes to ECM) these are the following resistance values at given temps:

F C OHMS
210 100 185
160 70 450
100 38 1800
70 20 3400
40 4 7500
20 -7 13500
0 -18 25000
-40 -40 100700

Good luck! By the way, are is your car running with a themostat?

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HummelHund
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Report this Post08-02-2001 04:56 PM Click Here to See the Profile for HummelHundSend a Private Message to HummelHundDirect Link to This Post
Yes, I replaced the thermostat not too long ago. I'll try what you said and see what comes of it. Thanks!

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Sean W.
'84 SE 2M4 WS6, The "Buzz Bomb". (restoration project to become daily driver)
'84 Sport Coupe, The "Black Wedge of Death" ($150 running car)

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87GTZ34
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Report this Post08-02-2001 05:13 PM Click Here to See the Profile for 87GTZ34Send a Private Message to 87GTZ34Direct Link to This Post
The symptom that you descibed sounds like a vacuum leak to me. If you have a vacuum gauge (or maybe you can borrow one) take a reading and see what you get. GL
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