Okay, new problem, the engine is overheating

[Rummel6]

I have a 2011 Tahoe LS with 195k miles on it and it has a new water pump, thermostat, expansion tank, and replaced hoses at firewall. The issue I’m having is that when I pass someone at high rpms, the engine starts to overheat. I have to pull over, shut the engine off, and wait a few minutes. Also, when this happens, I have no heat. Please help because I can’t figure out this problem.

 

[Tonyv__]

If you have no heat. Also assuming your heater core isn’t clogged. You may be low on antifreeze. After replacing all those parts. You have to continuously check your tank to make sure all the air pockets have been filled and that it’s topped off

 

[drakon543]

you may have a pocket of trapped air. at low rpms the flow is low enough to get around the trapped air. at higher flow it will compress the air and cause a blockage. you can either keep driving it at lower rpms and hope it works it way out and top the system off as needed as suggested above. your other choice is to drain the system back down atleast halfway approximately water pump level. then start the truck and as the truck is running slowly refill the coolant system until its topped off.

 

[Rummel6]

I have done both I’m thinking honestly I may be over spinning the water pump and causing the belt to slip since I have replaced everything on the front of the motor

 

[Rummel6]

My brother seems to think it may be running lean also but not sure on that because figured it would kick a lean code

 

[bill1013]

Check the tension on the serpentine belt as it may be slipping. Also, old belts get hardened and slick, so they work okay a lower RPM but lose it when you get on it. You may just need to change out the belt.

 

[OR VietVet]

How clogged up is the air flow thru your radiator? I agree though that sounds like low on coolant from air pocket(s). Does the thermostat have the little weep hole in it?

 

[Rummel6]

Tensioner is tight and I’ve topped it off a couple times and the radiator I would think is clogged I kee this thing clean

 

[wsteele]

Did the symptoms start after you replaced all the water pump, hoses, etc., or was that why you replaced all that stuff?

 

[Rummel6]

No it just started happening I replaced all those parts because the engine was squeaking but ended up being the cam needed replaced from that stupid afm so I did the full delete everything g has been fine for the last 8 months