engine temp switch

[74chev4x4]

So put the new wp on filled it with coolant through the intake, put tstat back on filled the rad started it and nothing.  It doesn't even act like its trying to flow anything.  I don't know what else to check its so frustrating.  Truck has been sitting for 5 months and I just want to drive it now and I can't.  Well if anyone has any ideas I'm open to them, thanks guys!

[beastie_3]

Any thoughts on it being or needing a reverse flow pump?

[74chev4x4]

thats a good point! Does anyone know what kind of application a reverse pump is needed.  Mine possibly.

[TexasRed]

Usually on a serpentine belt system. What's the part # of the water pump? I doubt that's the problem, but it could be!

[beastie_3]

I think they are only needed when the belt reverses the direction, like in a serpentine setup, which makes it CCW. The block wouldnt matter.

[74chev4x4]

yea just looked that up and saw that, shoot

[74chev4x4]

It must be blocked somewhere than right?  If I put the wp back on and filled the coolant throught the intake Tstat hole then the wp should be full of coolant and shoot just start shooting it down the rad hose and into the rad?  I dunno.

[74chev4x4]

not sure about the part # on the wp, just asked for one for a small block and told them what truck I have.  It must be something simple?

[beastie_3]

Im pretty sure you would have known if your engine got hot, might have had steam and coolant everywhere, but might not have.

It doesnt matter which hose goes to which end on the heater core, except I think they are two different sizes, so technically it does matter.

Do you still have the box for the water pump to get the PN? Shouldnt matter, but its something to rule out.

[beastie_3]

I just R and R my radiator, and to make sure everything was tip top, I filled the radiator with fluid and ran the truck with the cap off. The water level dropped because it was replacing the air inside the engine. I kept topping it off until it was good. I knew my WP was good because I could see the heater hose line shooting water back into the radiator. After a few days of driving it, i topped the radiator off again.

[74chev4x4]

yea right where the cap is the heater line should be shooting coolant back in i remember doing the same thing with my 454 but I had flow then. 511584 is the part number its a carquest wp.

[TexasRed]

that's std rotation then.

[74chev4x4]

might try filling up the heater lines just to rule that out as an air bubble in the system because nothing has really gone into the heater core or lines yet.

[74chev4x4]

ran water through the heater hoses then hooked it back up and ran it with the cap off and still nothing, God is it the motor or the truck.  If its the motor I will just rip it the heck out of there and put another one in its just money and this truck sure eats that!

[jaredts]

Are you sure you're not installing the thermostat upside down?