Mi truck is overheating I change thermostat, fans clutch, radiator is 6 month old, water pump is ok but is a lot o pressure when engine is hot and my cage mark 1/4 pass the middle mark of the cage, what is the possible problem?

Stratmando

Timing?, tune up?, brakes or wheels dragging?
Not saying compression test or blown head gasket yet. Ckeck Oil and water? Contaminated?
If tune up has been a while, plugs may reveal trouble.

hvacservicetech_07

Have you checked the radiator cap? try removeing it and let the truck run for awhile, if it doesn't overheat I'd replace it.

Vandy-1

I agree start with the easy inexpensive troubleshooting.
A worn cap not letting the system build up pressure can lead to boil off and
your symptoms.

GADawg

I also have the exact same problem with my 2002 RAM. Mine only overheats when I get up to 70mph for more than 5 or 10 minutes. Runs normally around town. I've flushed the radiator, replaced the thermostat, and replaced the clutch fan. But nothing has helped yet.

Rareautoparts

I have the same problem. Around town and short drives the temperature is normal except the heater only blows warm air, not hot. I have changed the water pump and thermostat. A mechanic said he thought I had a steam pocket in the engine. Sometimes an air pocket gets in the aluminum head and causes a hot spot and water does not circulate properly. He did a carbon monoxide test to see it has a cracked head and it doesn't. I've tried unsuccessfully to get the air pocket out. Can anyone tell me how to do this? I've tried keeping the cap off and fill it with anti-freeze and run the engine a long time. I've opened the bleed screw on top to let air escape. It still overheats after I've ran it on the highway for about an hour. Can anyone tell me an easy way to get air out of the cooling system?

Rareautoparts

I have the same problem. Around town and short drives the temperature is normal except the heater only blows warm air, not hot. I have changed the water pump and thermostat. A mechanic said he thought I had a steam pocket in the engine. Sometimes an air pocket gets in the aluminum head and causes a hot spot and water does not circulate properly. He did a carbon monoxide test to see it has a cracked head and it doesn't. I've tried unsuccessfully to get the air pocket out. Can anyone tell me how to do this? I've tried keeping the cap off and fill it with anti-freeze and run the engine a long time. I've opened the bleed screw on top to let air escape. It still overheats after I've ran it on the highway for about an hour. Can anyone tell me an easy way to get air out of the cooling system?

TxGreaseMonkey

Open the bleeder screw and fill the radiator, until coolant starts to run out. Close the bleeder screw, finish topping off the radiator, fill the reservoir to the "MAX" line, warm the engine to normal operating temperature, and squeeze the top radiator hose several times to purge any air.

firecop_22

I'm another one, I just replaced my thermostat and it still overheats. Also, it only blows warm air, not hot. Have you found out what the problem is yet?

TxGreaseMonkey

firecop_22, I would flush the heater core and replace the radiator, due to phosphate scale or corrosion. This link may help:

http://www.askmehelpdesk.com/cars-tr...tml#post235973

Refill with a 50/50 mixture of G-05 antifreeze and distilled water.