wide swings can often be attributed with a coolant volume issue or a thermostat issue. Open the rad cap to check level(dont just assume level is good because the plastic bottle has coolant in it) If that checks out then Id put money on the thermostat .
-
May's Cummins of the Month is now open for VOTING!
Strange engine temp problem.
I noticed something on my 01 dodge 3500, while running down the road at a stedy 68mph on flat ground the factory engine temp gauge is flucuating a lot from hot to cold. I looked on my quadzilla display and it shows it going from 180 all the way to 205. It dosent stop while on the highway. You can leave it ideling for 30+ minutes with out it getting hot or changing at all. When on the highway the clutch fan kicks on and off. I am thinking the waterpump and thermostat need to be replaced, but that dosent explain why it dosent do it on everyday driving and stop and go. Any advice would be great.
1 - 8 of 8 Posts
Exactly. Very rare for a water pump to fail on these truck, not exactly common for fan clutch to fail but thermostats failing are very common for coolant related failures from not flushing the system when required.wide swings can often be attributed with a coolant volume issue or a thermostat issue. Open the rad cap to check level(dont just assume level is good because the plastic bottle has coolant in it) If that checks out then Id put money on the thermostat .
I was leaning towards the thermostat anyways. Thanks guys
Simple way to keep it up to snuff...
1. Flush the cooling system every 30k miles or every 3 years.
2. When flushing the block out change the thermostat.
No problems...
1. Flush the cooling system every 30k miles or every 3 years.
2. When flushing the block out change the thermostat.
No problems...
i would check fluid first, and change the thermostat, might be stuck partially open or closed
The proper way to test coolant.i would check fluid first, and change the thermostat, might be stuck partially open or closed
Fleetguard Coolant Test Strips 4xCC2602B
Thermostat if you got to open it open to just check why not just replace it? :confused013:
Same thing was going on with mine, flushed it an changed the thermostat an filled it back up an it fixed it
1 - 8 of 8 Posts
- This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Cummins Diesel Forum
A forum community dedicated to all things Cummins Diesel! Originally founded for owners and enthusiasts of Cummins powered Dodge pickups, the Cummins Forum has expanded to include ALL Cummins Engine applications! Come join the discussion about reviews, drivetrain swaps, turbos, modifications, classifieds, builds, troubleshooting, maintenance, and more!
Full Forum Listing
Top Contributors this Month
View All
the man in black
397 Replies
Jimmy N.
384 Replies
dieselenthusiast
314 Replies
