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jwilky73
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| Posted: Aug 26 2013 at 1:02pm | IP Logged
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I have had my truck back for a couple of weeks now. I am overheating and it is very sporadic. Everything has been changed. Timing Belt, Water Pump, Thermostat and new belts. I have a feeling that the system was not bled properly. Any ideas? If so, please let me know what I need to do. Thanks again and you guys are great!
2001 Nissan Frontier Crew Cab SE
V6
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Murfreesboro, TN
2001 Nissan Frontier Crew Cab SE
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lakota
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| Posted: Aug 26 2013 at 2:39pm | IP Logged
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..
First check for water in the engine oil and oil in the
coolant.
I’ve never had to bleed a coolant system. Park the truck
on a hill with the nose up so any air can come to the
top. Let it cool so you can safely pull the cap and see
if the radiator is full and the over flow still has
coolant in it.
It sounds to me like you may have had air in the system
or in incorrectly installed thermostat stat causing the
temperature fluctuations. Also there is a bleed hole on
some thermostats itself that has to be at the top to
allow air to get out of the engine.
When the coolant heats up it expands and the excess
coolant transfers to the overflow tank. When the engine
is turned off , it cools, and the coolant contracts and
is sucked back into the radiator from the overflow tank.
The cooling system may be pushing the coolant out and
drawing air in, and having air displace the coolant.
Check the coolant levels in both the overflow tank and in
the radiator when the system is cool. Fill the radiator
and fill the overflow coolant to the minimum or cold
level. Drive the truck to warm it up then stop and check
the level in the overflow tank. It should have more
coolant in it than you had just put in it.
Let the system cool completely but check the both hoses
every half-hour while it’s cooling down to see if ether
hose sucks itself flat. That would indicate either a weak
upper hose, a bad radiator cap or a problem with the
overflow hose.
After it cools, check the overflow tank level. Did it
drop back to normal? (Carefully) remove the radiator cap.
Is it still full to the top? If the overflow tank stayed
higher and/or the radiator is not FULL TO THE TOP, the
system is sucking in air somewhere. That could be caused
by a leak up high in the system, such as the upper hose.
It could be a bad cap.
Good luck.. Don S..
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'99 4x4 3.3 Frontier Se KC Auto, 48,000 miles
'76 4x4 401 Wagoneer QT
'04 FWD 1.8 Sentra '08 FWD 2.4 Camry LE
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frontierguy
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| Posted: Aug 26 2013 at 7:15pm | IP Logged
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There is a bleed screw on top of the intake plenum. May
want to check rad and see how much debris has accumulated
on the front of it(I automatically do this w/ every T/B
job.)
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Traded 08 Frontier for 16 Frontier SV CC Long box, quite an upgrade. I do miss the 6 speed and Dynomax ex.
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2011 John Deere X720SE
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thedave360
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| Posted: Aug 28 2013 at 8:36pm | IP Logged
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Definitely check the bleeder valve, but I usually just
keep topping off the radiator before every cold start
until the level in the overflow starts. Eventually the
bubbles should cycle out. Works fine in my jeep (that
doesn't have a return)
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2.4L 5speed
***MODS***
Flowmaster 40 Series Exhaust
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Nissan Frontier Forums : Problems / Technical
Topic: Overheating Issues
