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?

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.

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.

Quote:

---

Originally Posted by 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.

---

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.

I also have the 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.

Quote:

---

Originally Posted by 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.

---

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?

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?

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.

Quote:

---

Originally Posted by 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?

---

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?

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

https://www.askmehelpdesk.com/cars-t...tml#post235973

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

Quote:

---

Originally Posted by TxGreaseMonkey

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

https://www.askmehelpdesk.com/cars-t...tml#post235973

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

---

Replacing the radiator is my next attempt to fix the problem. Since you mentioned it, I will try to flush the heater core (I've never done it before but I will give it a shot). Thanks for the quick response.

Quote:

---

Originally Posted by Wallyb

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?

---

Just thought I would tell you what I found with mine. My 02 Ram was overheating for no reason. I checked everything. Went to all the sites. It stated two things that could be wrong cause I checked everything else. Heater core or Head Gaskets.

To check the heater core you have to see if there is any moisture in the truck by the windows - I didn't have that problem.

Head Gaskets well pretty simple check to see if there is oil in the anitfreeze or antifreeze in the oil. The best was is to drain the coolant. - I didn't have that problem.

Well as it turns out I couldn't fix it I refused to believe it was the head gaskets or heater core so I took it to the mechanic and well they did a pressure test and it turns out there was a little crack in the rad jug ( the thing that holds the coolant) well they replaced that and now well my bill went from $700-$2000 to a misley $150 bucks. Boy was I freakin happy about that.

Ok so I am a girl so if I said something wrong try and figure out how a girl thinks you might get it.

Quote:

---

Originally Posted by Chrometruck

Just thought I would tell you what I found with mine. My 02 Ram was overheating for no reason. I checked everything. Went to all the sites. It stated two things that could be wrong cause I checked everything else. Heater core or Head Gaskets.

To check the heater core you have to see if there is any moisture in the truck by the windows - I didn't have that problem.

Head Gaskets well pretty simple check to see if there is oil in the anitfreeze or antifreeze in the oil. The best was is to drain the coolant. - I didn't have that problem.

Well as it turns out I couldn't fix it I refused to believe it was the head gaskets or heater core so I took it to the mechanic and well they did a pressure test and it turns out there was a little crack in the rad jug ( the thing that holds the coolant) well they replaced that and now well my bill went from $700-$2000 to a misley $150 bucks. Boy was I freakin happy about that.

Ok so I am a girl so if I said something wrong try and figure out how a girl thinks you might get it.

---

OK, I'll check that. Thank you.

2002 dodge ram 1500 4.7 SAME PROBLEM
Replaced - Thermostat, engine temp sensor, radiator cap, water pump
Purged and flushed out many times used distilled water and antifreeze,, nothing working.no head gasket leaks... new plugs, regular oil changes..
Next step is fan clutch and heater core flushing, fairly new heater core in it already.
Will keep updated if something fixes the problem

Turned out to be my heater core, had I tiny tiny leak or block somewhere, wasn't losing enough coolant to notice but had a puddle in my vents

I have the same problem with my 2002 with 4.7. new t-stat, hoses, cap, radiator was flushed, water pump OK, pressure test OK, takes about 30-40 minutes to redline on the gauge. Idles fine though.

The 3.7/4.7 is notorious for trapping air in the cooling system and causing the problem you're describing. Try this - remove the bleeder plug on the water outlet for the upper hose and the radiator cap. Pinch off the upper hose with a pair of vise grips or something similar. Put a small funnel in the bleeder hole and fill with coolant until the system is full and then remove the pinch off and reinstall the plug. Finish topping off the system at the radiator, start it up and see what happens. This method isn't 100% guaranteed but it works most of the time. If you still have air trapped in the system you'll need to find someone with a vacuum venturi tool that can pull the air out of the system. One more thing, are you sure the poppet valve in the stat is pointing up?

Try replacing the heater control valve if the car has one, sometimes and engine temp control sensor or switch will cause this to happen as well.

Sorry I meant engine coolant temp sensor or switch.

What can cause a 2002 dodge truck to over heat?