Over heats only on long runs, rad is cold some times but hot other times, water pump looks ok themosat looks ok and both work ok . pipes hot at top of engin but cold at bottom but some times norm.heaters dont work. just does not seem to pump water around. is it a block, where or wot can i look for next plz help me
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IT COULD BE LOTS OF THINGS WRONG. RAD COULD BE STOP UP, BAD RAD. CAP..
A LEAK IN THE RAD. SYSTEM. LOOK FOR WATER LEAKS. RUN YOUR CAR UNTILL IT IS HOT THEN FEEL THE RADATOR ON THE INSIDE AT THE BOTTOM IF IT IS COLD THE RAD. IS STOP UP... CHECK THE FAN CLUTCH MAKE SURE IT IS WORKING .......
CHECK FOR WATER PUMP LEAK TOO.......
Just fill it up until the water reaches to the highest rads. With the system running, try venting out the vacuum on the rads starting from the lowest to the highest until the warm water will be felt from each rad. Just send your e-mail comments and God bless you.
Run engine from cool, with rad cap off & heater on heat (not AC) and watch for circulation through rad when engine reaches normal operating temperature. Rev engine slightly from time to time for a couple of seconds, to increase flow & help bleed air out of system. Let it run for a while, and watch for increased flow in rad 2 or 3 times. Probably see air bubbles at same time.Hot coolant from engine comes in top, and back out bottom to engine after cooling in rad. The increased flow in rad ,indicates thermostat is opening & circulating cooler liquid back into engine. After 2 or 3 times put cap back on & fill return bottle only to line specified as warm/hot engine level.
Did you run the engine with rad cap off & heater (not defrost) on while topping up the coolant. If not, do it & let it run that way until your rad fan comes on & off about 3 times, then top rad up to a inch or 2 from top, and put cap back on, & check level in return bottle.