weird overheating
July 19th, 2018, 8:27 PM
#1
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weird overheating
we have an 05 uplander with 267,000 kms appx
the vehicle overheats at idle and at anything under 2000 rpm as soon as we bring it up to about 2500-3000 rpm it starts to cool the fan seems to be operating normally the waterpump and tstat have been replaced have not done a rad flush ...the heater core was leaking so it has been bypassed for now I should note the issue started before the waterpump,tstat replacement and heatercore bypass any insights will be greatly appreciated
the vehicle overheats at idle and at anything under 2000 rpm as soon as we bring it up to about 2500-3000 rpm it starts to cool the fan seems to be operating normally the waterpump and tstat have been replaced have not done a rad flush ...the heater core was leaking so it has been bypassed for now I should note the issue started before the waterpump,tstat replacement and heatercore bypass any insights will be greatly appreciated
July 20th, 2018, 12:48 AM
#2
have the system vacuum filled....manual filling leaves air trapped in the cooling system. the higher engine rpm moves a greater volume of coolant thru the system.
make sure the rad fins are not obstructed creating poor airflow thru the rad. all fan shrouds should be in place.
make sure the system can pressurize. a leaking surge tank cap will lower the boiling point of the coolant causing it to overheat a normal operating temperatures.
make sure the rad fins are not obstructed creating poor airflow thru the rad. all fan shrouds should be in place.
make sure the system can pressurize. a leaking surge tank cap will lower the boiling point of the coolant causing it to overheat a normal operating temperatures.
September 15th, 2018, 8:37 AM
#3
we have an 05 uplander with 267,000 kms appx
the vehicle overheats at idle and at anything under 2000 rpm as soon as we bring it up to about 2500-3000 rpm it starts to cool the fan seems to be operating normally the waterpump and tstat have been replaced have not done a rad flush ...the heater core was leaking so it has been bypassed for now I should note the issue started before the waterpump,tstat replacement and heatercore bypass any insights will be greatly appreciated
the vehicle overheats at idle and at anything under 2000 rpm as soon as we bring it up to about 2500-3000 rpm it starts to cool the fan seems to be operating normally the waterpump and tstat have been replaced have not done a rad flush ...the heater core was leaking so it has been bypassed for now I should note the issue started before the waterpump,tstat replacement and heatercore bypass any insights will be greatly appreciated
on a 2007 the fan circuits are in series on low and in parallel on high. i assume your 05 is the same. if so, both fans should turn simultaneously on low and high. one bad fan will disable both fans on low due to the series circuit... unless you rewire it, as i did on mine. my 07 clicks the fans onto low speed when the temp gauge hits the first hash right of the center on the temp gauge.
September 15th, 2018, 8:45 AM
#4
have the system vacuum filled....manual filling leaves air trapped in the cooling system. the higher engine rpm moves a greater volume of coolant thru the system.
make sure the rad fins are not obstructed creating poor airflow thru the rad. all fan shrouds should be in place.
make sure the system can pressurize. a leaking surge tank cap will lower the boiling point of the coolant causing it to overheat a normal operating temperatures.
make sure the rad fins are not obstructed creating poor airflow thru the rad. all fan shrouds should be in place.
make sure the system can pressurize. a leaking surge tank cap will lower the boiling point of the coolant causing it to overheat a normal operating temperatures.