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Do I Need To Bleed My Cooling System?

Tage

By Tage
in Ask A GM Technician

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Tage

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Posted

I have a 2003 GMC Yukon XL Denali with the 6.0L engine.

 

Several months ago I replaced the AC compressor. In order to get it off I have to remove some coolant lines going into the block which obviously released a bunch of the coolant. I replaced everything the way it was and filled it back up with GM "approved" coolant and I didn't run into any issues. The problem I am having is the truck will occasionally run very hot (like 240-260 vs 190-210 normal). Here are the conditions:

 

1. If I let it idle sitting still for a REALLY long time in a hot Arizona summer (yes the fan is working too)

2. If I am towing my enclosed trailer under a heavy load (i.e. uphill with more than 50% throttle)

 

For condition #1, granted the desert is hot, but this didn't happen before and I can't imagine any vehicle that doesn't have a fan strong enough to keep a vehicle cool at idle.

 

For condition #2, yes obviously I am asking a lot out of the engine and cooling system but friends with the same SUV and even heavier trailers floor it up hills and the cooling system never sees the temps I do. I have to run the heater full blast and totally baby the throttle to keep the engine from melting itself going up some of the big hills when I'm towing.

 

I am pretty sure something is wrong with my cooling system and I am thinking I may have missed something when I refilled the coolant. Is there a technique to bleed the system? I'm thinking I may have an air bubble trapped in there causing my issues. Any help is appreciated.

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