"Lo" still the only reading

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May 9, 2007 | 11:21 PM

#21

milsurpman

Instructor

Joined: Apr 2007

Posts: 225

Likes: 1

From: Highland Village texas

info

Quote:

Originally Posted by MorpheusGPR

Its got the same spade connector on it like the one I took out.

The unit I had in there was wrong and it went to the drivers side head. So that has been corrected I just need to re-wire what the previous owner did.

Its a brand new sensor I just put in.

I do not really have any experience using resistors.

Morpheus I have a 89 also. The sensor in the drivers head is supposed to be for the aux cooling fan if equipped and is a dark green white trace wire. The coolant temp sensor for the guage in dash per fsm is in the passenger head above starter solenoid. As per 1989 shop manual "disconnect the coolant temp sender and ground "dk grn wire" at the coolant temp sender connector. turn the ignition switch to run and observe the coolant temp display. If the coolant temp display indicates 330 f replace the coolant temp sender. if the coolant temp display does not indicate 330 f check "dark green wire" for open if the dark green wire is ok repair the instrument cluster.

May 10, 2007 | 07:30 AM

#22

MorpheusGPR

Thread Starter

Burning Brakes

Joined: Dec 2005

Posts: 998

Likes: 0

From: Indianapolis IN

Quote:

Originally Posted by jfb

470k is too high, you would have to parallel a bunch of them to get the temp gauge to change temperature reading. Why didn't you get a variable resistor? thats what you should have bought. Look at the gauge with the ign in run and start paralleling every 470 k resistor you bought and see if the dash temp gauge changes temperature.

Never bought them before, thought 470k was between 10,000 and 100,000 or 10k and 100k did not know the k was not for 1000. If I knew what I needed to buy I would have done it.

May 10, 2007 | 08:19 AM

#23

jfb

Team Owner

Joined: Mar 2001

Posts: 54,124

Likes: 30

From: Cincinnati, Oh USA

Read my post, ten posts up!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!

May 10, 2007 | 09:55 AM

#24

CE_Vetteboy

Racer

Joined: Mar 2005

Posts: 379

Likes: 95

From: Ingersoll Ontario

10k=10,000
100k=100,000
470k=470,000=way too big

If you parallel 16 of them together you could get 29k.

May 10, 2007 | 10:46 AM

#25

CFI-EFI

Race Director

Joined: Sep 2000

Posts: 17,298

Likes: 33

From: The Top of Utah

Quote:

Originally Posted by MorpheusGPR

Just for curiosity I had my wife sit in the car and I took some pliers, pulled the connector off the sensor and found some metal to touch it to. She told me it was varying around on the temp reading going up and then down etc. I had touched the metal portion of the connector to the manifold.

Thats the only time I have been able to get any reading other then "Lo" or the max (when I grounded it).

All of these fun and games with resisters is quite entertaining, but unnecessary. The above quote proves the the gauge and the wiring to it are working. There seems to be a problem with the sending unit or the installation, thereof. Of course, MorpheusGPR, you DO realize that the coolant has to be at at least 100° for that reading to come off of "Low".

RACE ON!!!

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