Water temp sending unit

bruceh · 10-03-2011, 01:51 PM

I am trying to locate the sending unit for the water temp gauge. Squirrels have been munching on my wires.

I have a scangauge and it reports water temp but the in dash gauge does not.

This is a 1998 Tioga on the Ford V-10 chassis.

Thanks,

subford · 10-03-2011, 04:07 PM

If this is a 1999 F53.
It dose not have water temp sending unit. The gauge uses the ECT sensor the same as the PCM Computer does.

bruceh · 10-03-2011, 04:38 PM

I don't think that it is an F53. It is a 1998 Tioga Class C built on the E-350 chassis.

If I understand you correctly, the in dash gauge and the scangauge work off of the same sensor.

subford · 10-03-2011, 09:26 PM

Yes the 1998 E-series with the 6.8L (V-10) also uses the same ECT sensor for both the gauge on the dash and the information to the PCM Computer.
It also has another head temp sensor (CHT) that just goes to the PCM Computer.

bruceh · 10-05-2011, 10:46 AM

Quote:

Originally Posted by subford

Yes the 1998 E-series with the 6.8L (V-10) also uses the same ECT sensor for both the gauge on the dash and the information to the PCM Computer.
It also has another head temp sensor (CHT) that just goes to the PCM Computer.

Based on this, how would I go about troubleshooting the non-functional in-dash water temperature gauge?

The scan gauge work just fine.

subford · 10-05-2011, 03:39 PM

Sent you a PM.

wglasson · 12-27-2011, 11:38 AM

My water and transmission guages are in the same cluster on my 1994 HR navigator. Both quit working at the same time. For a while my water guage would flip back and forth between cold and hot. I have replaced both guages and checked the fuses. The guages have power to them.
Does anyone have any suggestions????
Thanks for your help

cannon man · 12-27-2011, 02:53 PM

check your grounds

subford · 12-27-2011, 03:22 PM

Quote:

Originally Posted by wglasson

My water and transmission guages are in the same cluster on my 1994 HR navigator. Both quit working at the same time. For a while my water guage would flip back and forth between cold and hot. I have replaced both guages and checked the fuses. The guages have power to them.
Does anyone have any suggestions????
Thanks for your help

I am guessing this is a F53 class A motorhome.
I have not seen one with a "transmission guages".
Is this something you have added?

wglasson · 12-28-2011, 11:55 AM

It's a class A 300 Cummins on a Freightliner chassis. Water Temp, Tran. Temp and Light switch are in the same cluster.

subford · 12-28-2011, 12:56 PM

Then you are posting in the wrong forum.
You need too post in the Freightliner Motorhome Chassis Forum
Freightliner Motorhome Chassis Forum - iRV2 Forums

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wglasson · 12-30-2011, 08:48 AM

I am attaching a picture of my water temp and trans. temp. gauges along with the harness that connects both gauges and headlight switch. I have installed all new gauges and headlight switch. I attached my volt meter to the red wire and ground to the chassis and I get power. I then attached the meter to the red wire and grounded to the other 7 wires on the plug and got the same voltage reading by touching each of the wires except the purple wire in the very middle of the plug and I didn't get any reading.
Can someone with electrical knowledge tell me if the purple wire could be the problem or any other advise.
All advise will be greatly appreciated.