Temperature Gauge Problem

[Callan]

Now when i'm driving normaly the temp gauge will sit at the line just below half, slowly climb to the line above half then in 2 seconds fall down to the line below half again and repeat. I'm starting to think its either a bad ground somewhere or the sender unit? Any ideas? i'm thinking of saying screw it and get some autometer mechanical gauges that i can trust.. lol

thanks

Andrew

[GO OVRIT]

A bad ground will cause the temp and oil pressure gauges to read high. I've had to fix the ground on th raiator support by the battery on a couple trucks.

[Ace]

Mine did that for a couple days until it purged the air out of the system after I replaced the heater hoses.

How's the antifreeze level look? I'd suspect water level and thermostat-related issues.

[Callan]

I flushed the rad after I got the truck and all the levels see good. What is the best way to purge the air out?

Its been wagile since I flushed it. Would the air not work itself out over time?

Thanks


Andrew

[1991cummins]

yah it should work it self out... no problem... sounds like a thermostat problem, for sure, its gettin too hot, and then letting in a bunch and cooling and then starting over...

had the same problem on mine towing one time... i didnt like it lol

[Callan]

Yeah I don't like it either. Maybe I'll change that thermostat see if that works

[dpuckett]

THe swinging of the temp gauge needle is not unusual. Not right, but I've had some do that in the past.

Daniel

[rbrettctd]

Dont worry too much over it. I changed the thermostat 3 times, new hoses, radiator flush.....finally wised up and put a aftermarket water temp gauge on it....wouldnt you know it stays right around 180 while the stocker bounces off my doors.

[Callan]

well i do feel better that i am not the only one with this problem! aftermarket gauges are definitely on their way that is for sure. Then i can have some peace of mind and actually know what the temp is! not just the line just over half or something.. lol