Re: [FWDLK] help again

180* sounds normal, I suspect the problem is in the sending unit or gauge.

The ‘57 temp sending unit might be a clue as ‘55 is 6v and ‘57 is 12v. But I’m not sure if the ‘57 uses a voltage reducer for the temp gauge.

Are you sure you didn’t get a ‘56 temp gauge? ‘55 is part # 1622135 and ‘56 is # 1627497. They look the same.

You might have a bad gauge that’s grounding out to the dash which would pull the magnet to the hot side of the gauge.

There’s a way to use a multi-meter to vary the current from the gauge to ground and measure the amount of resistance it takes to get different readings. Beyond my pay grade though I’ve watched it done. Works well.

The factory service manual has some basic testing procedures. One is to remove the sending unit, ground it, and put the bulb in hot water with a thermometer. 180* should be centered on the gauge, 145* = low normal, 225* = high normal.

If you still have the original gauge I’d hook it up to the sending unit and a jumper wire to the battery and see what you get.

--Roger van Hoy

From: Jesus Jimenez

Sent: Wednesday, March 21, 2012 5:50 PM

To: L-FORWARDLOOK@xxxxxxxxxxxxx

Subject: [FWDLK] help again

Hello,

I am completely dumbfounded and I have hit a dead end on my cooling problem with my '55 Ply 6 cyl. Essentially, the motor overheats as indicated by the meter. The meter hits the highest temperature even before the thermostat opens. Consequently, I have worked as systematically as I was able to try to eliminate possible problems but still, the meter indicates overheating before the thermostat opens:

These are things I have done or observed:

1. changed the thermostat three times from 180 to 160 (tested both thermostats separately in hot water and both open)

2. checked the timing

3. replaced the radiator with another one

4. replaced the water distribution tube with a brass type

5. replaced the water pump with a NAPA brand

6. replaced the temp gauge

7. replaced the temp sensor twice-the current one is brand new from a '57 Chrysler

8. replaced the wire sending unit twice with wires of different gauges (#14 and #16)

9. checked oil pressure --normal

11. done reverse flushing

12. checked the water temperature with a glass and metallic thermometers and both indicate 180 degrees as the water circulates when the thermostat opens.

As the motors runs, water circulates and both hoses are hot but by this time the meter indicator is out of range and have to turn the engine off.

Hope someone has some other ideas or maybe knows what's going on.

Thanks

Jesus '55 Ply 6 cyl Belv

No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1424 / Virus Database: 2113/4880 - Release Date: 03/19/12

*************************************************************

To unsubscribe or set your subscription options, please go to
http://lists.psu.edu/cgi-bin/wa?SUBED1=l-forwardlook&A=1