LeviMXUSMC

Well Gentleman

It was just a matter of time till I came to the reliable DTR people for advice.
The last couple days I have been noticing my eng. Temp fluctuating about 5 to 10 degree's. It will get a little warmer when I get on it then let it off. No loss of coolent no leaks No white smoke that I can see at start up. It is heard to tell if the pump is flowing. is the KDP a problum with 05 2500????? I have never seen the temp move like that un less pulling a load up hill.

She is a daily driver to and from work. I am having a head gaskit fear.

Any help or direction will be greatly appreciated.

Sur5er

Try changing the thermostat. The spring may be binding.

madhat

No KDP on third gens.

I would inspect the weep holes on the water pump, make sure you're not leaking coolant. This could be a water pump going south.

Check your coolant level.

Could be a T stat, I don't often hear of them going bad.

Do a pressure check on the system. Inspect the rad cap, replace if necessary.

Look at the fins, make sure you don't have something blocking the air flow.

Let us know what's up.

Start with the cheap stuff first

Scotty

Is your fan clutch cycling...engaging and disengaging?
I would lean towards the t-stat first.

madhat

Yeah, forgot about that... thanks, scotty.

The fan wires have been known to get jacked up... lay under the truck and look up at the back of the fan, you'll see some wires and a connector down there that control the fan. Make sure they are not jacked up. If you need a diagram to trouble shoot, let me know, I think I have one.

LeviMXUSMC

Yes sir I called countryboy in NM and he told me to start with the t/s. If you do have those diagrams that would be grate.
Thanks Madhat and Simper Fi

madhat

You got it, buddy. If you don't see it this evening, Shoot me a PM.

madhat

Disconnect the fan clutch harness connector.
Check connectors - Clean/repair as necessary.
Measure the resistance between the fan clutch (Y1) driver circuit and the fan speed
(K4) sensor return circuit on the fan clutch assembly.
Is the resistance less than 10 Ohms?
All
Yes ! Replace the fan clutch.

Disconnect the Fan Clutch harness connectors.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between the fan clutch (Y1) driver circuit and the fan clutch
battery supply circuit on the fan clutch assembly.
Is the resistance less than 6 Ohms or greater than 10 Ohms?
All
Yes ! Replace the fan clutch

LeviMXUSMC

Thanks Gunns.

madhat

No sweat at all. Actually, a little... I was hard pressed to come up with that...