I replaced my waterpump,therm., hose,but my truck still keeps over heating, 94 chevy truck v8?

Answer 1

You have to determine if the motor has a flow problem or the radiator has not enough capability to cool the coolant as it passes through it. One of the easiest repairs and one that is often overlooked is simple cleaning of the rad fins. These trucks had a tendency to accumulate a greasy film which dirt sticks to in between the rad and the AC condenser. Remove the upper rad shroud being careful not to break anything. Look down in between the two and check to see if it is full of crap. If so, spray it down with a high pressure washer until you are satisfied. If this is the solution, you are done by re-installing the shroud. Remember to spray this area when washing your truck as it will continue. If it is a flow problem within the motor, you will first have to remove the thermostat again to enable flow while inspecting without the motor running. Remove hoses to simulate flow with a garden hose used a the water pump. Flow should whip through all areas withoout much resistance. Normal problems would be a internal pluggage inside the radiator, shifted gaskets by the water pump or the intake manifold. You'll have to eliminate things before you can be sure which is causing the problem.

Answer 2

first the cheapest....
check the thermostat..(8-12 bucks)
If there is a restriction in the system like a kinked radiator hose, a restricted radiator, or a stuck thermostat, it will produce the same affect as the sock in the mouth scenario. Rust and water calcification can accumulate in the radiator and drastically reduce the flow of coolant at high speeds. Removing the radiator from the vehicle for disassembly and cleaning or radiator replacement are the only two real cures for a clogged radiator.

Using a can of "radiator flush" additive might help as preventive maintenance, but will probably just be a waste of time and money trying to correct a restricted radiator. You can read the article about radiator flushing in the archive link below.



and i agree with "DODGE MAN" check the t-stat in a pot of water first....

Answer 3

Sounds like you need to get the radiator "Roded out". What they do is take the radiator apart and push rods through it to clean out all the crap that builds up. After the shove the rods through the dip it in an acid bath then put the upper and lower tanks back on and paint it for you. It's like getting a new one. Very rarely will you need to replace the whole radiator but that can happen if it's in really really bad shape. You might want to just try a good radiator flush as recommended above however I would recommend taking it to a radiator repair shop and make sure it's done right the first time.

Good luck

Answer 4

The only thing that will make it overheat is the thermostat, radiator, and fan clutch. If you already replaced the thermostat, then the next thing to check would be the fan clutch. Spin it and see if it keeps spinning when you let go of it. Also check to see if it has any movement in it from front to back. It should feel like it is dragging some. If it is good then you need to get your radiator cleaned out.

Answer 5

just maybe you put your thermostat in upside down the coper thingy should be towards the engine block side wich is the side that gets hot then opens up to circulate hot into your rad. if its upside down it wont open .also you might want to check if its circulating, open your rad cap then start it keep en eye on your temperature. but look into your rad with a light. when your thermostat opens it will circulate and if your rev your engine a lil you will see it circulating really good. could also be an airlock in your engine. to get airlocks out sometimes can be a B,,,ch but start your truck back it in a ditch or something to bring your front higher then your rear end then leav it run with rad cap off. that way your rad is a lil higher then the motor and have a better chance of getting air lock out. if you know of a nice rough hill leave your rad cap loose and go up that hall and back back down a few times sometimes that works better . worked for me but my camaro didnt like the rough gravel pit hehehe. good luck hope this helps a bit.also dodge man is right sometimes takes more then one thermostat before getting a good one. i never buy no canadian tire thermostat . took me 3 one time to get a good one. then realise the ACdelco one at GM was only 10$ and the canadian tire one was 4 $ so i rather pay double and get something good.if that doesnt work bring it to get it flushed on the machine costs about 75$ canadian but that way its impossible to get an airlock and works wonders for cleanning your inside of your ports.

Answer 6

Other ideas:1.Rubber air dam below front of truck missing.2.EGR valve non-operational(causes over heating And bad gas mileage.)3.Timing to far advanced(causes excessive heat ,pinging and knock.)4.Bad radiator cap seal.(need 16 lb pressure cap).5. 02 sensor could be contaminated causing computor to deliver lean fuel mixture(causing over heating).6.Radiator could have flow restiction.7. Lower radiator hose may be collapsing when engine is running.8.Vacuum leak(check all vacuum lines for no crack conditions(if cracked repair).

Answer 7

I would check your cooling fan relay and your coolant temperature sensor. It measures the coolant temperature in the block or the head and tells the fan to kick on at a certain temp. This is designed to keep your engine running at just about 187 degrees. Much hotter and you don't get the desired performance for various reasons. My money is on the sensor.

Answer 8

i mechanic for a living,,and you may need to flush the engine out real good ,replace the thermostat,and also check the radiator,,i bought 3 thermostats in one day before i ever got a good one,,that's usually what makes people have over heating problems,,they say they put a new thermostat in,,but they didn't check it before they put it in,real easy to do,put it in a pot of water,and bring the pot to a boil,,it should open before the water boils,,if not its no good,,hope this help,s good luck with it..

Answer 9

ok well my sister has a 03 pontiac grand am gt and it was over heating and the relay fans wasint working check fans on truck allso the termustate my be stiking

Answer 10

You may have a plugged radiator or a blown head gasket.
Is the radiator getting hot.