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2007 silverado 4.8 over heating on idle

Peterramirez7475

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Peterramirez7475 New Member

Peterramirez7475

Posted
Posted

Hello All,

Im new to the site and was wondering if i can get some info on my problem. I recently had the heater hose leak and I replace it never did my temperature ever go over 210 but now it does just past the zero on the 210 but then the fans come on and goes back to normal, i bled the system over and over then flushed the radiotor replaced the thermostat twice and the coolant sensor once and still the same problem, but what I notice if I keep the AC on my truck never over heats stay right at 210. Now Im going to replace the both serpetine belt and tensioner see if that will fix the issue but does anyone know what it may be causing it????

Raptordude Enthusiast

Raptordude

Posted
Posted

It's probably a solenoid or something that actuates your fan is intermittently failing (these fans have clutches, they aren't electronic so there may not be any solenoids) if that's the case, your fan clutch may be going out. I'm not terribly familiar with the fans on silverados

 

In the Jetta I have, it has electric fans that always run when the AC is on, and are actuated by a sensor and solenoid to turn on when they need to. Just something to think about

 

 

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Raptordude Enthusiast

Raptordude

Posted
Posted

Correct. In my Jetta, the fans come on low speed with the AC on, and high speed when the motor needs cooled. You have a wiring issue. Find the thermoswitch and jump the connections with a paper clip to see if you can get high speed to run

 

 

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Silverado4x4 Senior Enthusiast

Silverado4x4

Posted
Posted

Sounds like you still have air in the system it can be tough to get out sometimes or flushing the radiator you could have plugged some of the radiator veins , you did put the right degree thermostat in?

Dnt Senior Enthusiast

Dnt

Posted
Posted

Unless you have recently flushed the system when you exposed the OLD Decool to the atmosphere you have MUDDED it and the only fix is to have the system thoroughly flushed and refilled with fresh coolant. At the same time I would debug the condenser and radiator fins.

Peterramirez7475 New Member

Peterramirez7475

Posted
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Posted

Hello All,

 

Thank you all for your input, yesterday i replace both belts and the tensioner and same thing happens over heats just pass the 210 mark and fans come on and it will go back to normal at 210, but it was hot here in socal yesterday so i had the AC on all the time driving and not once did it over heat stay at exactly 210 today I'm going to bleed the system and hopefully I will get all the air out. I did flush the radiator with a water hose last weekend but not the whole system if bleeding doesnt repair the problem Im going to take my truck to get a flush.

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