C15 - water temp erratic - what could it be?

Good point oscar, if they left the one at the rear off going to the cab, it might cause this as well. I think there are more than one going to the frame also, check it out, my motto is "always check the free easy stuff first".

 

mine has three sensors two on top of thermo housing and one in the front that is very hard to reach. it is usally the one in front that gives me trouble with the plug.

 

if all else fails. go to dealer and buy new sensor. then find a matching one on the engine.

i replace sensor twice before mine started working correctly. the original was just flat out lazy and read whatever it wanted. but not untill the engine was warm. the first replacement was slow in reaction.

still waiting to get my refund bvack after 90 days from that first replacement.

 

Let us know if you resolved the guage issue. I think you pin pointed the problem. Good luck Buddy.

 

Where is the sending unit for the temp sensor? Anyone?

 

E-model is in front of front valve cover on passenger side on top of thermostat housing. You will see two sending units beside each other. One is for gauge other is for ecm. One wire per unit.

 

Thank you

 

How about on a NXS model acert ?