BarFlyFisherman
NAXJA Forum User
I'm baaaaack...
I'm still overheating... to recap:
Extra weight/gear: I have about 1000 lbs of gear on/in my 1999 XJ 4.0L A/T 4x4 (safari rack, aftermarket bumpers, winch, rock sliders, rear swing tire carrier, 2 gerry cans). The drivetrain is stock, OEM tires/wheel size, w/a 3" lift. Lowered transfer case with SYE & new driveshaft.
I've replaced the following (with NEW parts):
flushed out the system 5-6 times now... clean as can be & no debris/rust (I've even placed an old pantyhose on the flush line to see what debris I could capture - nada)
radiator (3 row), metal tanks, 30% thicker than 2 core
2 ROW:
http://picasaweb.google.com/lh/photo...eat=directlink
3 ROW:
http://picasaweb.google.com/lh/photo...eat=directlink
radiator cap
(3) 10" 1300 cfm electric fans (all three come on together, A/C forces activation regardless of engine temp)
water pump (flowkooler)
upper radiator hose
lower radiator hose (with factory hose & inner wire spring)
thermostat
thermostat housing
serpentine belt
hood air scoop (in reverse to create negative pressure area under hood)
using 40 coolant /60 water
power steering & A/C coolers still in OEM locations.
completely new exhaust - (except manifold: new pipes, cat, & muffler)
New head gasket (mag'd the head, no cracks, everything looked great, heat was flat, no signs of bridging, tears, breeches to the outside, or cross contamination)
Added an aux transmission cooler (in front of, but not onto radiator)
Dexron VI transmission fluid
Royal purple oil
burped it & burped it
even had a shop install the coolant mix with a pump & recovery system to ensure that there was no trapped air
Finally WENT BACK TO THE OEM FAN & CLUTCH (NEW - $$ OUCH!), electric aux fan and stock fan shroud...
Now, I've been through the aftermarket circle, and back to the OEM set up.
Still getting temperature spikes, I'll run around 210ºF then will suddenly spike to 265º, but only when the A/C is on.:flame:
Is there something that could cause the A/C to go to a crazy high temperature & thereby affecting the radiator temperature (not allowing the radiator to sufficiently cool the engine coolant)?
ANY ROCKET SCIENTISTS (or retired Jeep engineers) OUT THERE SITTING QUIETLY IN THE WINGS???
I'm still overheating... to recap:
Extra weight/gear: I have about 1000 lbs of gear on/in my 1999 XJ 4.0L A/T 4x4 (safari rack, aftermarket bumpers, winch, rock sliders, rear swing tire carrier, 2 gerry cans). The drivetrain is stock, OEM tires/wheel size, w/a 3" lift. Lowered transfer case with SYE & new driveshaft.
I've replaced the following (with NEW parts):
flushed out the system 5-6 times now... clean as can be & no debris/rust (I've even placed an old pantyhose on the flush line to see what debris I could capture - nada)
radiator (3 row), metal tanks, 30% thicker than 2 core
2 ROW:
3 ROW:
http://picasaweb.google.com/lh/photo...eat=directlink
radiator cap
(3) 10" 1300 cfm electric fans (all three come on together, A/C forces activation regardless of engine temp)
water pump (flowkooler)
upper radiator hose
lower radiator hose (with factory hose & inner wire spring)
thermostat
thermostat housing
serpentine belt
hood air scoop (in reverse to create negative pressure area under hood)
using 40 coolant /60 water
power steering & A/C coolers still in OEM locations.
completely new exhaust - (except manifold: new pipes, cat, & muffler)
New head gasket (mag'd the head, no cracks, everything looked great, heat was flat, no signs of bridging, tears, breeches to the outside, or cross contamination)
Added an aux transmission cooler (in front of, but not onto radiator)
Dexron VI transmission fluid
Royal purple oil
burped it & burped it
even had a shop install the coolant mix with a pump & recovery system to ensure that there was no trapped air
Finally WENT BACK TO THE OEM FAN & CLUTCH (NEW - $$ OUCH!), electric aux fan and stock fan shroud...
Now, I've been through the aftermarket circle, and back to the OEM set up.
Still getting temperature spikes, I'll run around 210ºF then will suddenly spike to 265º, but only when the A/C is on.:flame:
Is there something that could cause the A/C to go to a crazy high temperature & thereby affecting the radiator temperature (not allowing the radiator to sufficiently cool the engine coolant)?
ANY ROCKET SCIENTISTS (or retired Jeep engineers) OUT THERE SITTING QUIETLY IN THE WINGS???