Air pockets in Block - Pirate4x4.Com : 4x4 and Off-Road Forum

bigbeast · 02-25-2005, 12:07 PM

I have a 350 in my FJ-40. I just replace the radiator, thermostat, hoses and water pump. I think I have air pockets in the block. What is the best way to make sure there are no air pockets in the block. I was getting wild temperature fluctuations on my temp gauge, when I ran it down the street.

Thanks in advance
Ken

Rredfj40 · 02-25-2005, 12:12 PM

Park it on an incline so that the rad fill is the highest point in the system and let it run up to temp for a while to "burp" the system. Leave your heaters on full blast as well to run coolant through them.

Rredfj40 · 02-25-2005, 12:13 PM

with the rad cap off, of course

peesalot · 02-25-2005, 12:50 PM

sometimes loosening a heater hose and letting it burp there works , yes you loose some water but it may help . you may have a stuck or sticky thermo , that has always caused wild temp flux in my exp. ( which aint much )

bigbeast · 02-26-2005, 02:56 PM

I changed the thermostat (I guess the new one
was bad

), and it is working great.

Thanks

02-25-2005, 12:07 PM	#1 (permalink)
bigbeast Registered User Join Date: May 2003 Member # 19889 Location: Phoenix Posts: 75	Air pockets in Block I have a 350 in my FJ-40. I just replace the radiator, thermostat, hoses and water pump. I think I have air pockets in the block. What is the best way to make sure there are no air pockets in the block. I was getting wild temperature fluctuations on my temp gauge, when I ran it down the street. Thanks in advance Ken

02-25-2005, 12:12 PM	#2 (permalink)
Rredfj40 Registered User Join Date: Oct 2003 Member # 23803 Location: KFalls, OR Posts: 117	Park it on an incline so that the rad fill is the highest point in the system and let it run up to temp for a while to "burp" the system. Leave your heaters on full blast as well to run coolant through them. __________________ Joel 82 FJ60 88 FJ62

02-25-2005, 12:13 PM	#3 (permalink)
Rredfj40 Registered User Join Date: Oct 2003 Member # 23803 Location: KFalls, OR Posts: 117	with the rad cap off, of course __________________ Joel 82 FJ60 88 FJ62

02-25-2005, 12:50 PM	#4 (permalink)
peesalot Registered User Join Date: Dec 2003 Member # 24859 Location: Where ever my wife says Posts: 4,566	sometimes loosening a heater hose and letting it burp there works , yes you loose some water but it may help . you may have a stuck or sticky thermo , that has always caused wild temp flux in my exp. ( which aint much ) __________________ Mellonhead

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02-26-2005, 02:56 PM	#5 (permalink)
bigbeast Registered User Join Date: May 2003 Member # 19889 Location: Phoenix Posts: 75	I changed the thermostat (I guess the new one was bad ), and it is working great. Thanks