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164k miles is periodically overheating..back down..idling…

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My 99 STD with 164k...
My 99 STD with 164k miles is periodically overheating. It will go from 205 to 230, went to 246 today and fall back down as fast as it went up. This happens idling or driving. Outside temp is about 85. I have checked for exhaust gasses in coolant twice both times fluid blue. I have replaced thermostat twice boiled second one to make sure it opened. Currently running car for 3 hours in driveway with flush cleaner in it. Replaced upper rad hose as it was starting to degrade. Any info would be greatly appreciated. Thanks.
Submitted: 8 years ago.Category: Cadillac
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Answered in 2 hours by:
6/10/2010
Cadillac Mechanic: John, ASE Certified Technician replied 8 years ago
John
John, ASE Certified Technician
Category: Cadillac
Satisfied Customers: 9,176
Experience: ASE CERTIFICATIONS A1-A8 & L1 / 40 YEARS AUTOMOTIVE EXPERIENCE
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Hello & Welcome to JA,

 

Go to your local parts supplier & get a "block test kit" which comes with instructions for about 30.00 & test your vehicle.This will tell you if there is exhaust gases in the cooling system.If there is ,you have a blown head gasket,cracked block,cracked cylinder head.

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Customer reply replied 8 years ago
I have al ready done that as I posted that in my question. Thanks
Cadillac Mechanic: John, ASE Certified Technician replied 8 years ago

Since the temperature change happens so quick ,I would next need to see a scan tool data to verify & compare computer data to instrument cluster gage.

if the radiator is plugged up,a flush will not repair it.Replace the radiator .if needed ,after temperature has been verified for a true reading.

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Customer reply replied 8 years ago
I have checked with scan tool that's how I'm getting exact numbers. I did replace radiator a little more than a year ago so it's not original. Also should coolant come out of purge line when cold?
Cadillac Mechanic: John, ASE Certified Technician replied 8 years ago
Coolant will come out IF the pressure is more than the radiator cap is rated.Usually a 15-17 lb cap is used .when the engine is warming up pressure builds before the thermostat opens.you may have a weak or faulty cap.
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