temp gauge testing

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temp gauge testing

Postby Jl0696 » Sat Nov 01, 2014 7:40 am

92 w250 temp gauge not operating just sits all the way to the left. how would i test the sensor and wiring before i spend 70 on a new sensor?
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Re: temp gauge testing

Postby ellis93 » Sat Nov 01, 2014 1:48 pm

I don't remember what mine was like but if it's one wire that goes to it,ground it against the head and have someone eyeball the gauge. It should set on the H when the wire is grounded.
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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Re: temp gauge testing

Postby CumminsPower59 » Mon Nov 03, 2014 1:53 pm

ellis93 wrote:I don't remember what mine was like but if it's one wire that goes to it,ground it against the head and have someone eyeball the gauge. It should set on the H when the wire is grounded.


Correct. It is just a one wire connection. The coolant temp sending unit is on the rear of the cylinder head, drivers side, darn near up against the firewall. Make sure to get a good ground when testing, as the head, sending unit and the wire can get pretty crummy being back there.
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Re: temp gauge testing

Postby Jl0696 » Sun Nov 09, 2014 11:29 am

yep grounded out the wire and it reads H so my temp sensor must be bad guess ill order a new one today
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