Can a truck run good with a blown head gasket? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 12-28-2007
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Can a truck run good with a blown head gasket?

Hey guys im trying to figure out my overheating/underheating issue with my truck. I replaced the radiator cap and thermostat twice. What happens is the engine temp will stay cold for too long, then all the sudden it will skyrocket and overheat and blow coolant out the resevior. It will do this every 1 out of 3 times that i drive the truck. It almost acts as if there is an air pocket that keeps getting in or something. Then again it really seems like a thermostat issue but i have replaced it twice already. Yes i put it in the right way.
The weird thing is if it was a bad headgasket or cracked head, wouldnt it run rough? My truck runs smooth.
Any ideas!!?!?
I need help im getting sick of this crap, i though the 3.0L were supposed to be good motors.
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Old 12-28-2007
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It could, might be a small leak? Plus it will only blow out of the reservoir when the T-Stat opens.

You could have your truck pressure tested.
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Old 12-28-2007
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I'd recommend taking it to a reputable shop and having them check the cooling system for leaks or exhaust getting into the cooling system.
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Old 12-28-2007
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take it to a shop that can test for leaks, pressure, etc..
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  #5  
Old 12-28-2007
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That don't sound like a blown head gasket. A blown head gasket is usually the same all the time.

That is kind of a puzzle. Maybe you need to take it to a radiator shop and have them test it and see what they think.
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Old 12-28-2007
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okay sounds like a plan to me. It must be a small leak because it doesnt leak anything, and the oil does not have antifreeze in it. Also, when i take the thermostat out of it, it never has those problems. One more thing, after i get done driving the truck and shut it off, there are bubbles coming up and bubbling in the resevior.
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Old 12-28-2007
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I bet the water pumps on it's last leg!
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Old 12-28-2007
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I think you have a very small compression leak into the cooling system. I had something similar happen in my race car. It would leak very little coolant into the cylinder but the compression and firing in the cylinder would slowly pump gasses in to the cooling system until the pressure got high enough to blow out the radiator cap. Then it would begin overheating. The problem was a very small crack in the cylinder wall.

I had a similar thing happen to my 428 CJ engine and it would have bubbles coming out of the coolant reservoir after shutting it off. The problem with it was a very small compression leak around a cylinder sleeve. I was able to seal it with an expensive block seal.

It doesn't seem likely that a bad head gasket would have this kind of symtom but it is possble. It is more likely a metal crack.

Both of those vehicles ran very well while it had these symptoms. The compression leak was small enough that the compression was not reduced much.
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Old 12-28-2007
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yea it is very puzzling to me! I doesnt run like it has a blown head gasket. Could one of the cylinder heads be warped or cracked just a little bit?
The only thing we could come up with is somehow there is exhaust being pumped into the cooling system.
4LO 4.0- Why do you say the water pump is on its way out?
The truck never overheats or anything else with the thermostat out of it.

I also have tried some headgasket repair stuff that you pour into the radiator with water and it is supposed to seal up everything, and that didnt work either.
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Old 12-29-2007
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Quote:
Originally Posted by UnderdogGN
4LO 4.0- Why do you say the water pump is on its way out?
The truck never overheats or anything else with the thermostat out of it.
I had the same problems, would run fine then all of the sudden it would over heat and when you shut it off it would gurgle.
Replaced the t-stat, hoses,clutch fan, even the rad only to still have it happen agian, replaced the water pump and it has never happened again.
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  #11  
Old 12-29-2007
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mine did the same thing. Ended up being 2 cracked heads. It'll get worse before it gets better.
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  #12  
Old 12-29-2007
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Thanks for all of the help guys. Im going to be betting on a cracked head or two. Im dropping it off at a buddies shop today because i dont have any time right now to try and fix it. So when the word comes through, ill let you guys know what it is that causes the weird overheating isssues.
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  #13  
Old 1 Week Ago
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After head gasket changed massive amount of white smoke coming out the exhaust

Blown head gasket after changing it truck as a massive amount of white smoke and still runs hot what do I do I replaced the radiator,thermostat,head gasket ran motor flush through it changed oil and filter 2 times its a 99 ranger 2.5liter engine 5speed manual trans rwd has 211,656 on the dash what do I do or what am I doing wrong

Last edited by Shawnbates; 1 Week Ago at 02:24 AM. Reason: Forgot info
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