Suspect water pump

Z_ealot

Ok so did a direct test of the radiator fans, will have a video up shortly....

Z_ealot

fan test...

Z_ealot

No more input?

Jhill

Can't really tell with my little phone speaker. I'll have to check later when home but not sure this is one that will be able to diag over net.

Dreadnaught

Any update on this?

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Z_ealot

yes there is...I drained the coolant system this last weekend took of the thermostat and did a back flush on the entire system, put everything back together and it seems to have helped, turned on the AC last week during a 90 degree day and it didn't overheat....coolant temps stayed around the low 190's with ac on so I guess we'll see how it goes and i'll chime in if anything else comes up

Jhill

That is truly weird considering your input and out temps before. I really wonder if you just had an air pocket that wouldn't come out before. That's what it sounds like to me, we once had a vette that the dealer released 3 times and 3 times it overheated with the customer (embarrassing that it left without being verified 3 times and our dealer was one of the best but when the wrong people get assigned to the car then only so much can be done). Anyway it was trapped air in the upper crossover pipes. Do a vacuum fill and done no more issues, sometimes it really is the simplest thing.

Spooler

Yeap, it was an air pocket. Sometimes they can be a challenge to get out.

Z_ealot

Update: finally had another over 80 degree day and tried out the ac once more.....engine started overheating again. Went ahead and have ordered a brand new water pump and will update once i find the time to install it

Spooler

Sounds like you have a blown head gasket. This is the only thing that I know will cause this type of issue except for an electric fan issue where the fans will not kick up to high speed.

Z_ealot

Radiator pressure test passes, block test passes and no pressure left in system when car is run hard and left to cool down overnight, all of which would have indicated a blown head gasket. Only thing left to provide a definitive answer on that would be a compression test which i will most likely do after swapping out the water pump, but i have my doubts that the head gasket has anything to do with it as i have been talking to several other mechanics including those at corner 3 garage and with all the information I've given them they doubt it's the head gasket as well and have come to one of two conclusions....either the water jackets around the cylinders are clogged or the water pump impellers have corroded away. Being that their is no record of the coolant system ever being flushed or serviced and with all the troubleshooting that I've done along with the mechanics it leaves me with the only component i havent addressed in the system, which is the water pump. I know it's hard for some to believe that our water pumps could fail due to how they are constructed, but with how acidic coolant can become after so many years of not being changed you kinda have to entertain the possibility of that acidity eating away at the impeller on the pump. I will update this thread when i get the time to change out the pump and will let everyone know the results along with pics if i can get them.

Rusty

When you swap out water pumps. I would like to see pictures of the impeller. Be best if you can show both new and old.

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Z_ealot

May have finally gotten the water pump to give up the ghost and caught it in the act. Started car from cold start today with no load on engine and low and behold i can hear the faint sound of.....squeak, squeak, squeak, squeak. Bend down in the engine bay to try and locate it and nearest i can tell it's coming from where the water pump sits. Definitely not belt squeak or pulleys as i have already dealt with that in the past and know what it sounds like so i think we have a winner here.

Rusty

That could be the bearings going bad now.

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Z_ealot

So after a long process of gathering up parts i have conclusive evidence the water pump was bad, so without further ado here is your so called indestructable water pump on our cars.....



All that white crusty stuff and some clear water you cant see is from the weep hole....somebody has taken this engine apart before and had sealed the outer weep hole so there was never going to be a trace of coolant leaking from the water pump....on top of that the primary timing chain was put on in a haphazard way so it was on correct timing, but the colored keys on the chain werent lined up with the timing marks on the crank and camshaft sprockets....needless to say all of this is in the process of being corrected


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