changed my upper and lower rad hoses today. filled the rad up 50/50 with H2O and antifreeze...has not bubbled out air, nor pressurized lines. drova around the block a few times with no change. the hoses are hot, the rad cap is hot., and the over flow is still flow. the rad did drop maybe an inch in that time.

could it be a faulty thermostat or H2O pump???

maybe even a bad rad cap not holding its own?????

what yall think???

btw..its a 93 ctd 1st gen 12v 346k miles and a loose nut behind the wheel...

 

Hey Bajafun,
When your thermostat opens, you can look in the radiator & see the coolant flowing with the cap off. If the coolant isn't flowing, the thermostat is still closed. Did you get it up to operating temperature?
Scott

 

did you burp it as you added coolant??? on my jeep when I changed the coolant I just filled up thea rad and started it up. it ended up overheating as I let it idle up to temp and I was like wtf. turned out what you have to do is grab the upper rad hose and squeeze it. this burps out the air through the opening in radiator. cap ahs to be off as well. becauseif you hget an air pocket aroudn the water pump then the pump just cavitates I think the proper word is so possibly that's ur problem I dunno tho.

 

ran it to operating temp with cap off. exercised upper and lower rad hoses to get the air out. no change in water level. drove it this mornin. temp guage stays about where it should be, even with the a/c on.

guessin ill just replace the t-stat.

you know where it is??? behind the alternator mounting bracket [:@]

have to drop the alt, then remove the bracke, along with the stat housing....

 

yea soudns to me like thermostat is stuck closed.

 

Wait a minute, is it getting up to temp? If it is and doesn't take an hour to do so, the tstat is working. If you get it up to temp and pull the cap off and there is no pressure, then you need a new cap.

 

the rad cap has the pressure release valve. when I arrived home erlier with it, I hit the release and pressure steamed out.

 

So is everything working fine? cause you got me confused

 

well, so am I.

I am just gonne change the t stat sunday and be done with the guessin.

I did see the temp guage move up and down a smidgen sat wheile drivin. maybe the air was bleedin out. i dont know. not gonna chance it while we are still in the 100's durin the day.

all i need to do is over heat the diesel 25 miles from home in the desert...

 

update..



the truck has sat all day sat from 1pm till 2115 hrs sat night.

checked it before I ran 4 miles to the store. very warm ...

temp guage was all over the place in the 8 mile round trip.

[sm=headbang.gif][sm=headbang.gif]

hopin its just the stat and not the pump....we will find out tomorrow..