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You guys were a BIG help with the last problem i had. Hope you can do it again.

Engine tends to run warm even during cold weather. Takes it a while but the temps edge up until it ingages the fan. Cools off good and then repeats. Sometime is even shoots down like it got a burst of water from somewhere. Almost like a thermostat opened. Had the thermostats replace when i had the last problem fixed that you helped with (oil comsumption). Need to get this thing repaird before HOT weather gets here. I have also power washed the radiator to make sure nothing was trapped in the cooling fins.

:sad:

It could be a head gasket starting to go bad, check the outside of the engine block for dried coolant leaking from the sides of the head drying up on the engine block.

What make of engine do you have and what is the mileage , etc. ?

Cat 3126 with 150,000 miles.

It sounds perfectly normal to me. Temp climbs, fan comes on, temp drops. Could just be your new thermostats are working and your old ones weren't.

Did the same thing with the old thermostats also. The problem is it can be 40 degrees outside and the fan comes on. I agree that the fan cyclying on and off is perfectly normal. The part that bothers me is, it has never did this before and i do not think the fan should be cyclying on as often as it does when it is cold outside. It cycles on and off in less than a mile and does this continously during the trip. The temps continue to climb slowly during the trip but once they reach the max temp (205) the fan will cycle on and cintinue cycling from that point on. I had the upper hose replaced and the thermostats. I have never changed the radiator cap. Does this sound like it could be a potential problem. Would prefer to eliminate the small/cheap things first.

I believe your fan clutch is bad, a fan clutch shouldn't cycle that much. In normal driving the ram effect of the air going through your grill is enough to keep the engine cool.

The clutch fan should only engage when the engine is working harder, like climbing hills, etc.

The fan only comes on when the temp gauge reaches 205 degrees. The temps rise and lower as the fan comes off and on.

Come on guys. As many miles as you have logged and as many drivers as you know, you guys have seen or heard it all. Give me things it could be. Summer is coming and i am going to be in real trouble if i do not get it fixed soon.

Ronm I don't know if this will relate to your problem because when I had this problem it was on a S60.

Fan off and on constantly. Turned out being a small diaphram switch on the air conditioning compressor. Even if the air conditioning was off when this switch failed the fan would still cycle on and off, even at 180*. Check around your air conditoning compressor for any wiring that might be plugged in wrong or not all the way.

What gets me is why is your truck getting to 205 anyway. I know the newer motors run a little hotter. But isn't 205 a little warmer than normal?

I drive older stuff and I stay at 185 unless I am pulling hard. Fan comes on at 210. Stays on tell about 190 and then I go back to 185 if I am back on flat ground.

Did this start right after the last repair for the oil consumptsion?

If so is it possible they put the thermstats in up side down. I don't even know if that is possible but you never know.

If your charge air cooler is leaking bad the motor can run warm.

I guess if it was me I would think back to see if this started after the last repair and then figure out what was taken apart and possible not put back together properly that might cause the engine to get hot.

Check for foamy oil --- Head gasket


Check for compression bubbles in coolant ---Head gasket

Your fan clutch needs air pressure to disingage and to stay disingaged.
Do you have a leak in the air line going to the solinoid that ingages and disingages you fan clutch.

I don't think it is the fan clutch itself, something is telling it to ingage and then disingage.

When your truck was worked on the mechanics have a hard time climbing around to get to some parts of the motor and they step in allot of places that probably shouldn't be stepped on. Maybe a wire in a harnes got stepped on or a plug is partially unplugged.

What was the normal operating temp of your truck before all this started?

I know you are pulling your hair out. Do you haul real heavy? My fan hasn't come on since last August!! With 49,000 on the deck.

Hope something here helps

Mike