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2001 gmc yukon 5.3 is overheating. Replace thermostat

Sent to Chevy Experts January 13 2008 at 9:31 AM
   

2001 gmc yukon 5.3 is overheating. Replaced thermostat and still overheating.

 

Optional Information:
2001 GMC Yukon 5.3

Already Tried:
Changed the thermostat

Customer (name blocked for privacy)
Status:  Closed   Value: $15
Answer
January 13 2008 at 9:48 AM (16 minutes and 56 seconds later)
         
ACCEPTEDCheck Mark
Hello,

its somewhat common that the coolant temp sensor goes bad and registers a high temp value to the gauge, But if it is visibly getting hot then lets look at the major causes:

bad water pump, doesn't necessarily leak when its on its way out.

bad stat ( which you replaced)

plugged radiator

Let me know if I can be of further assistance

Thanks,
Josh

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Joshua -- GM Performance Tuner -- 97% Positive Feedback on 129 Chevy Accepts
Extensive Training in GM engine management systems & performance Tuning.
Reply
January 13 2008 at 11:14 AM (1 hour and 25 minutes and 45 seconds later)
         
Reply to Joshua's Post: I just replaced the fill cap and didn't solve the problem. This problem has been going on for a while ,but off and on. But now it just stays hot. Yesterday I rushed home as it was overheating and barely got home. As I was approaching my drive way the engine was wanting to shut down. Today the engine runs fine, but was still getting hot. After I changed the thermostat and added coolant, I noticed that the coolant in the filler tank wasn't going down. So I assumed it was a flow problem. By the way, the water in the filler tank was either bubbling or boiling for a few seconds after I shut the engine off.

Thanks,
Rafael
Customer (name blocked for privacy)
Answer
January 13 2008 at 11:16 AM (2 minutes and 48 seconds later)
         
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Joshua -- GM Performance Tuner -- 97% Positive Feedback on 129 Chevy Accepts
Extensive Training in GM engine management systems & performance Tuning.
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January 13 2008 at 2:45 PM (3 hours and 28 minutes and 54 seconds later)
         
Just replaced the water pump and still overheats.

The radiator flows good. I placed the water hose in one outlet and water flows freely out the other end. One thing I noticed is that with the new water pump the water bubbles a lot continuously in the filler tank. The bubbles come out of the hose that connects to the water pump from the filler tank.

There's no water in the oil to indicate a blown head gasket.
Customer (name blocked for privacy)
Answer
January 13 2008 at 3:28 PM (42 minutes and 23 seconds later)
         
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Joshua -- GM Performance Tuner -- 97% Positive Feedback on 129 Chevy Accepts
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