have u checked the radiator? make sure its not all gunked up slowing down flow.

 

the radiator is fine

 

Check your coolant level, and the fan clutch also.

 

coolant levels are good and has new fan clutch..do you know which way the fan clutch is suppose to spin

 

Your 87 came with serpentine belt system. Water pump and fan turn counter clockwise, with you looking at it from the front of the vehicle. When you replaced the water pump are you sure you got one for the correct rotation.

Bonestock

 

yeah that sounds right and i got this water pump http://www.autozone.com/autozone/parts/_/N-93xmn?CJPID=3430108&cmpid=cj&itemIdentifier=483453_0_0_

 

Maybe you possibly got the wrong thermostat, put it in upside down, or got a defective one? Should open at 195 I believe.

 

bought a brand new one and its in right

 

Are you 100% sure the system doesnt have air in it?

 

what do you mean by that?

 

i have tried burping it but no bubbles would come up

 

Maybe we should question the mechanical condition of the motor?

 

motor has 230,xxx but feels strong

 

Does the overflow bottle fill up when it runs hot? In other words, does the system blow out coolant?
Are you going by the temp gauge or is there actually evidence of over heating? Like hot smelling engine, heat expansion noise (sounds like cracking parts) unable to touch a valve cover...
With the radiator cap off, stick your nose there and see if it smells like exhaust gas.
Does the radiator get hot? Like you can't touch it?
Air will always find it's way out of a system. Check the radiator after sitting over night.
I know people say you have to 'burp' the cooling system, i have never had to do this. I fill the rad, run the enigne untill the tstat opens, then add coolant until full. Let the rig cool down, and recheck.
As JK ^^ said, there are only so many variables that can cause over heating.

Oh, I don't think it is possible to install this backwards, but do you have the snake belt properly installed?

 

no the system does not blow out coolant and we have put 3 different temp sensors and they all mark hot and the motor does feel really hot..the tube going to the thermostat gets really swollen

 

I've noticed that too with my 2.8 I've absolutely never had to burp it. I just top it off and go. Every morning I just pop the cap and keep topping it off till it won't take anymore.

 

Have you had the engine apart recently?

Does the rad feel too hot to touch? I'm trying to narrow the possibilities. If the rad becomes way hot, you have circulation. This would mean that you don't have enough air flow through the rad.
If the rad stays cold = little or no circulation. Bad water pump, (although it's new) bad tstat (although it's new). You may also have poor or slow circulation due to a restriction in the system.

Suggestion: from cold, start the engine with the rad cap off. Run the truck and watch for the tstat to open. The coolant in the rad will start moving pretty quickly indicating the tstat opened. The coolant should move pretty well. If this happens, the tstat and pump are working.

Does the fan pull good air? Feel behind the fan (make sure you put your hand in it ) to see if there is plenty of moving air. You don't really have to feel with your hand, the air should be cruising around really fast.

Only other thing I can think of... I have pulled rads and found grass, twigs, dirt, leaves and other stuff (including dead birds) that have partially blocked air flow. Especially if you have A/C. Crap gets stuck between the rad and condenser.

Also, do you have a rad shroud installed?

There has to be a sollution... all it takes is figuring it out. (duh)

 

I'd take the radiator and have it cleaned. It's not going to hurt anything by doing it, and that's just good preventative maintenance. But hell, it may be better to just buy a new one because they are so cheap now, and a cleaning/rodding sometimes runs $100...my last radiator was $129. Brand new.