I have read many posts on this subject but have not found one similar to mine. Few weeks back I was getting misfire from my #3 and #6 cylinder and Truck was running rough. Tested all the spark plugs, wires, coils seems ok except I had doubts about the plugs are getting weaker may be. Decided to do a tune up and replace spark plugs and filters, Oil etc. The truck is running great now.

New problem Engine is getting overheated on my way back from Work everyday. Keep in mind Austin, TX around 100 degrees in the afternoon. Engine is fine in the morning with AC on. Checked the Auxiliary fan this morning and it was on after driving about 30 min.

I am not loosing any coolant - that was my 1st concern.

Suspect #1 Thermostat
Suspect # 2 may be clogging in the system
Suspect # 3 using all vehicle Preston coolant (I have been using for almost 5 years now without any problem)

Any help and suggestions will be appreciated.

Thanks

 

What temperature are you calling overheating? What are you seeing?

Did you also replace coolant in your 'tune up'? Potentially got air trapped?

 

One more observation. My main fan looks wet with Oil. not sure where that came from. wonder if the water pump is giving up.

 

That's ominous. Are you sure it is some kind of oil a not antifreeze? I've never heard of it but could it be from your viscous fan coupling? If so your fan may not be doing its job and that could explain heating issues when the ambient temp rises. But what temps are you calling overheating or are you going by the gauge. The gauge doesn't budge until about 230 degrees, which is very hot indeed. If you are using a scan tool of some sort I wonder how high it is in degrees. I was in Austin an San Antonio about a month ago... it was really, really, hot... and I was in the upper 190's.

I've had a water pump leak and fail but it got the front cover wet, not the fan.

 

I think charlie may be on the right track with the fan clutch going out. After the truck gets warm turn it off and try and spin the fan by hand. If it spins with little resistance then it probably a bad clutch.

As far as the oil on the fan goes. If you are certain its oil and not coolant then the fan clutch does contain some oil so that may be the cause but the other likely source is the front cover is leaking. You will just have to try and track down the source to be certain.

 

I think I found the problem. Water Pump is leaking. Saw coolant coming out of there small amount. That's probably why I am loosing coolant (glad it's not Head). What kind of water pump have you [all used. I see URO brand all over also OE one from British Rover. My Point is if they were made so well then why would they give up?

Thanks

 

You may have had a problem with the gasket or the seal. Not sure which since I'm not quite sure where it is coming from based on the description.

The best is a pump with a brass impeller. Other than that I think any metal impeller water pump will work. Be sure to get the gasket. Probably takes 45 minutes to swap and you'll be good to go.

 

It looks to be coming from the gasket, and not the weep hole. The drivers side, where it comes out through the front cover into the water pump. I was there with him and we could see it dripping from there. He is going to go ahead and purchase a new pump since he is going to remove his fan clutch anyway to see if it is the culprit of the oil on his fan blades.

 

Joemamma1954 is an amazing man! He figured out my problem in 15 min. Next weekend would be working LR to fix this issue, my question is why would the truck over heat if the leak is so minor?

 

I had the same issue you did. The coolant level gets low, making room for air. Air can prevent your coolant from circulating properly. That's why people go to such lengths to be sure all of the air is bled from the cooling system. If you have air pockets, you get hot. If it gets hot enough, the water in the coolant will eventually make steam and that steam creates pressure, which can blow out hoses and head gaskets.

That's my theory anyway

So good thing you and Joe figured it out!