So I been having cooling issues now for about a month and the truck has been to the dealer twice now it all started with puking coolant out of the degas bottle and the coolant needle peging in the red and the engine fan running loud. The first trip to the dealer they did head gaskets and put in ARP studs for me...everything seemed good till I hooked up my 26' toyhauler for a trip and the engine fan ran would run about 75% time but the temp guage never moved but it has stopped puking coolant...so I took the truck back to the dealer and this time they did an oil cooler...I just got home from a camping trip towing my trailer and again the fan was on about 75% of the trip and while towing up even the slighest grade it is on the whole time up the hill, I had one long grade to climb and once I got to the top it was my exit and when I got off the highway I looked at my tach and it was at 0 rpm but the engine was still running...I only had to go about a mile off the hwy so I went slow till I got there, once I stopped I let it idle for a few minutes then shut it down, I let it sit for about ten minutes then started it back up and now the tach is reading normal...really confused! I also noticed that now when turn the key to start the truck the ticking I would normally hear sounds muffled and the ticking sound that I usually hear for about 15 sec after shuting down I don't hear anymore...
What's going on with my poor truck? Why is my fan on so much while towing? Are all these problems related to a part the dealer is not checking? I am taking the truck back to the dealer in the morning, any suggestions I should give them? I have a feeling the Egr cooler needs replacing just because all the posts I have read suggest if you have head gaskets replaced the oil and egr coolers soon next...

Help!!

 

yep...egr cooler and valve need to be replaced..the egr cooler is leaking internally back into the exhaust and down the cylinders and out the exhaust.

 

I haven't lost any coolant since getting the head gaskets replaced though...could the egr cooler be clogged?

And why was my tach acting funny at the top of the grade? It kinda felt low on power but that was probably because the fan was on...would the egr have anything to do with that?

 

I think you have some electrical issues. I would be interested to see what your coolant temp actually was when the fan came on or shut off.

You don't have the symptoms of a failed EGR cooler. You would be blowing coolant and/or burning coolant and would have excessive white smoke from what your describing. They should have replaced the EGR cooler when they did the Oil cooler though. I might have this backwards but I believe coolant flows through the EGR cooler in to the oil cooler so in order for the oil cooler to fail the EGR cooler would have to fail. This is why they are replaced in pairs.

 

I'd be curious to know if all the harnesses got plugged in "all the way" when they removed your cab....when I had my headgaskets done they left a mess of problems.

 

I would like to know what the temp was too but all I have is the factory dash guage and it didn't move, the tech told me it is mostly controlled by the oil temp which made sense by them replacing the oil cooler...I wonder why they only did the oil cooler and not the egr cooler too since from my understanding from reading other posts that like you said how the egr makes the oil cooler fail.

 

Outside possibility - my fan runs most of the time when the outside temp is 85 deg's +. I read here along time ago when I posted about this (because I thought I had a problem) that this is part of the later engine strategies. I never bothered to find out, I just put up with it because I cannot stand the thought of having to take it in. Maybe you have been re-flashed or upgraded or something similiar. Just an outside possibility, but the fan running a lot sounds very similiar.

Good Luck with it.

 

Do you have a CEL? Thermostat comes to mind for me.

 

I believe it is oil cooler 1st and then EGR cooler. Thus a plugged oil cooler overheats the EGR cooler and blows the solder seams in the EGR cooler.

 

No CEL and they replaced the thermostat when they did the head gaskets.

I don't think they reflashed it...if they did it didn't show up on the bill, but I will ask when I go in if they did.

 

I never get it right I could read it five million times and still forget.

Well good luck with it and let us know what they find. Like joe blow said maybe they left something unplugged. It definitely sounds like a electrical issue is at least one of your problems.

 

Well I took the truck in today and talked to the tech and he wants to road test it with me and have it hooked up monitoring as I drive to see what is making the fan come on...I am going to go back tomorrow and take him for a ride...

They did a reflash that is why I don't hear the ticking on start up and shut down...but he had no idea why my tach went crazy...