opps hit the button while I was editing the title. It's NOT REACHING the 195 temp.


My '99 1500 4x4, 5.9l auto. 86k miles. I installed a Hughes FI AirGap intake last fall and it runs like a raped ape.

BUT the truck has been running cooler and cooler and MPG falling all summer like the thermostat is stuck open, so I changed the thermostat with the 195 deg and the temp sensors, BUT its still running cold maxes out at 180, I am driving up to my cabin tomorrow see if it gets any warmer.

Would a bad clutch fan (stuck on) keep the engine from getting to the 195 deg.? Or is there some secret I never heard of.


And now that winter is here I gotta get the heat working before the deep freeze hits. My heat has been minimal, but today after messing with the heat ****, I got the heat to start coming up. Went from its 95 deg to 140+ deg after messing around with it. I think the Heater control panel needs to be replaced.

Best place to get a new one?

 

For parts either a junk yard or LMC truck.

 

Even if the fan was running solid, (seized up.) The thermostat should still get the engine to its rated temp. Sounds like a bad 'stat.

 

What are you using to determine engine temp?

 

OBD II reading the live engine data. Also visibly lower on the extremely accurate factory gauge.

this is the 3rd stat since installing the Hughes, I cant believe that I would have gotten 3 bad thermostats. New one is a Saint SuperStat.

Testing the one I replaced opens at 195 deg.

 

Change the temp sensor.

 

I picked up a BWD (have a Duralast now) yesterday on my way back from up north, this will be #3 also but different brand.


Maybe I should use the old one out of the old kegger.

 

I was thinking temp sensor also. What part did you get that's #3? Also if you can get an IR temp gun or something to try and check the engine temp to see if it seems accurate.

 

Well replaced the Sensor, But I had it backwards last two sensors were BWD.

So I changed it up and went with the duralast. Showing a little warmer 187deg at idle.

Definitely up on the factory gauge.

After messing with the heater lines had some sludge in the system. Time for a full system flush.

Renting so don't have access to a decent water source.

 

One would think finding someplace to do an true coolant flush & clean wouldn't be such a task.

All the local joints just drain the radiator fill with distilled water run it, drain and fill with antifreeze. They call it a flush & clean, just a crappy flush if you ask me.

The only place I can find to do a real clean and flush is about 40 minuets north of me through a bunch of road construction (that by the way NEVER ends here in Milwaukee)