'93 GC Coolant Temp Gauge problem
 

My '93 GC 4.0L 6cyl dashboard temp gauge has started going crazy. It
is bouncing between full cold and the correct center scale temperature.
It seems to be motor load dependant such that if I step on the gas the
gauge works, coasting the gauge drops. I wacked the dashboard and that
does not make the gauge work. I figure it is a bad connector or the
wiring is going bad at the sensor but my real question is where is the
dashboard gauge sender located on the engine?

I see one temp sensor at the front of the engine right near the
thermostat with two wires going to it but I think that one is for the
fuel injection. In my case the engine runs fine when the gauge is at
mininum temp, gas mileage is about the same as ever, and I am not
getting any check engine lights or codes so it seems as though there is
probably separate sensors. Can anyone give me a hint where the sender
is?

Walt B.

Re: '93 GC Coolant Temp Gauge problem
 

On the drivers side top rear of the head. Could be a purple wire if it
is like the old ones.

I would be checking the connection and if it's ok but looks pulled on
then I would be checking the engine and tranny mounts for a blown one.
A bad mount can let the engine move enough to pull on that wire.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

wb wrote:
>
> My '93 GC 4.0L 6cyl dashboard temp gauge has started going crazy. It
> is bouncing between full cold and the correct center scale temperature.
> It seems to be motor load dependant such that if I step on the gas the
> gauge works, coasting the gauge drops. I wacked the dashboard and that
> does not make the gauge work. I figure it is a bad connector or the
> wiring is going bad at the sensor but my real question is where is the
> dashboard gauge sender located on the engine?
>
> I see one temp sensor at the front of the engine right near the
> thermostat with two wires going to it but I think that one is for the
> fuel injection. In my case the engine runs fine when the gauge is at
> mininum temp, gas mileage is about the same as ever, and I am not
> getting any check engine lights or codes so it seems as though there is
> probably separate sensors. Can anyone give me a hint where the sender
> is?
>
> Walt B.

Re: '93 GC Coolant Temp Gauge problem
 

On the drivers side top rear of the head. Could be a purple wire if it
is like the old ones.

I would be checking the connection and if it's ok but looks pulled on
then I would be checking the engine and tranny mounts for a blown one.
A bad mount can let the engine move enough to pull on that wire.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

wb wrote:
>
> My '93 GC 4.0L 6cyl dashboard temp gauge has started going crazy. It
> is bouncing between full cold and the correct center scale temperature.
> It seems to be motor load dependant such that if I step on the gas the
> gauge works, coasting the gauge drops. I wacked the dashboard and that
> does not make the gauge work. I figure it is a bad connector or the
> wiring is going bad at the sensor but my real question is where is the
> dashboard gauge sender located on the engine?
>
> I see one temp sensor at the front of the engine right near the
> thermostat with two wires going to it but I think that one is for the
> fuel injection. In my case the engine runs fine when the gauge is at
> mininum temp, gas mileage is about the same as ever, and I am not
> getting any check engine lights or codes so it seems as though there is
> probably separate sensors. Can anyone give me a hint where the sender
> is?
>
> Walt B.

Re: '93 GC Coolant Temp Gauge problem
 

On the drivers side top rear of the head. Could be a purple wire if it
is like the old ones.

I would be checking the connection and if it's ok but looks pulled on
then I would be checking the engine and tranny mounts for a blown one.
A bad mount can let the engine move enough to pull on that wire.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

wb wrote:
>
> My '93 GC 4.0L 6cyl dashboard temp gauge has started going crazy. It
> is bouncing between full cold and the correct center scale temperature.
> It seems to be motor load dependant such that if I step on the gas the
> gauge works, coasting the gauge drops. I wacked the dashboard and that
> does not make the gauge work. I figure it is a bad connector or the
> wiring is going bad at the sensor but my real question is where is the
> dashboard gauge sender located on the engine?
>
> I see one temp sensor at the front of the engine right near the
> thermostat with two wires going to it but I think that one is for the
> fuel injection. In my case the engine runs fine when the gauge is at
> mininum temp, gas mileage is about the same as ever, and I am not
> getting any check engine lights or codes so it seems as though there is
> probably separate sensors. Can anyone give me a hint where the sender
> is?
>
> Walt B.

Re: '93 GC Coolant Temp Gauge problem
 

Thanks for the info. I'll take a look tonight after work. One
clarifying question. Is the sensor on the backside of the head facing
the firewall or on the drivers side of the head near the firewall end
(i.e. somewhere under the intake manifold)?

Walt B.

Re: '93 GC Coolant Temp Gauge problem
 

Thanks for the info. I'll take a look tonight after work. One
clarifying question. Is the sensor on the backside of the head facing
the firewall or on the drivers side of the head near the firewall end
(i.e. somewhere under the intake manifold)?

Walt B.

Re: '93 GC Coolant Temp Gauge problem
 

Thanks for the info. I'll take a look tonight after work. One
clarifying question. Is the sensor on the backside of the head facing
the firewall or on the drivers side of the head near the firewall end
(i.e. somewhere under the intake manifold)?

Walt B.

Re: '93 GC Coolant Temp Gauge problem
 

Right on the top corner pointing up.

Mike

wb wrote:
>
> Thanks for the info. I'll take a look tonight after work. One
> clarifying question. Is the sensor on the backside of the head facing
> the firewall or on the drivers side of the head near the firewall end
> (i.e. somewhere under the intake manifold)?
>
> Walt B.

Re: '93 GC Coolant Temp Gauge problem
 

Right on the top corner pointing up.

Mike

wb wrote:
>
> Thanks for the info. I'll take a look tonight after work. One
> clarifying question. Is the sensor on the backside of the head facing
> the firewall or on the drivers side of the head near the firewall end
> (i.e. somewhere under the intake manifold)?
>
> Walt B.

Re: '93 GC Coolant Temp Gauge problem
 

Right on the top corner pointing up.

Mike

wb wrote:
>
> Thanks for the info. I'll take a look tonight after work. One
> clarifying question. Is the sensor on the backside of the head facing
> the firewall or on the drivers side of the head near the firewall end
> (i.e. somewhere under the intake manifold)?
>
> Walt B.