Overheating issues

Hello,

This could be a problem with the serpentine belt tensioner allowing the serpentine belt to slip and not adequitely spin the water pump. Another thing you might consider is making sure that there are no air pockets in the cooling system not allowing the coolant to circulate. The best way to do this is fill the system from the highest point in the system with the radiator cap off. When coolant starts to come out of the radiator cap hole, the system should be full of coolant and air pocket free. You might also consider doing a flush and fill. I know basically your whole cooling system is new, but maybe you have scale and deposits in your block, clogging the water jacket ports. The last thing I can think might be your problem would to be to double check to make sure you have the correct temp thermostat. Let us know what you find out.

Thanks,
Alex
2CarPros

Run the same combustion gas test and see if it's still leaking under compression. (A cheat to test this is to put a balloon over the coolant fill, if it inflates really fast you have a leak) Have seen head gaskets leak like a one way valve before on them. Have also seen blocks crack and only leak under pressure.
Whose water pump and gaskets did you use? Some of the aftermarket parts are real junk.

Have you pressure tested the radiator cap? Have seen bad caps cause fluid to over flow and overheat. Also check the coolant temperature sensor. It could be giving a false reading.

Does the cooling fan run when the engine warms up?

Did you replace the water pump the impeller? It could be degraded not circulating the coolant correctly.

If the temp guage goes up and you do not loose fluid then the first thing I think about is the thermastat. If you are looseing fluid then I would have the system pressure checked. A number of things can make it overheat, . Not enough coolant, 2, clogged system, 3, a bad themstat. With the thermastat is usually the problem that I would change first first

Bleed the system, you may have an air pocket thats not allowing the coolant to go into the heater core, also check your engine coolant temperature sensor

Sounds like you need to get the radiator unclogged. Lower hose should warm up with the engine.

It blows cold because there is no coolant in the system to heat the air.

It has to be done at a radiator shop.

Hi DennSubaru and TY for the donation

but at the same time one half of the radiator is hot and the other half is cool to the touch. It shouldn't be-should equally be hot across the radiator. That coolant is not circulating. Take the thermostat out and run it if its still doing it make sure the water pump is doing its job if it is-try bleeding it for airlock and report back

Water pump check:

One way to test for a bad water pump is to squeeze the upper radiator hose when the engine is hot and idling. Careful, because the hose will be HOT! If you do not feel much coolant circulating through the hose when you rev the engine, the pump may be bad. The other cause might be a bad thermostat that is not opening properly (remove and inspect the thermostat), or a clogged radiator.