muddyjeep96
NAXJA Forum User
- Location
- New Bruanfels, Texas
I have a 96 cherokee with 4.0L that I am having problems with it running hot (215-225) at high speeds (75-80mph) on the freeway and will over heat into the red line at idle in the drivethru or trail. Intown driving or slower freeway speeds are ok (temp will 190-200)I have never let it get into the red (shut it off when it reaches the last white line). I have replaced in the past 2 years (10,000miles) due to failure: robertshaw 180 stat, hesco highflow housing, new water pump from orielly (factory replacement), hoses, heater valve, belt, fan clutch (xj standard replacemant), fan shroud, temp sensor and sender, radiator gdi 3-row (4 years back). I have a 9 blade (no idea what year, half the jeep has 97 electrical parts on it) aux fan that will come on with a/c but without it waits till the temp is about 220. I run a tranny cooler in addition to the plumbing in the rad. Coolant is 50/50 with distilled water and i have tried redline additive with little results. I keep the jeep maintained better than a NASA project so there is little to nothing in need of replacing (even straightened all the fins on the condensor & rad and clean passageways). I can't find the sourse of the problem, if the part is new i assumed it is working but now I am not so sure.
My thoughts is this a issue with being able to cool off the fluid in the rad or a fluid flow issue since I get a lack of cooling at idle and high freeway speeds? I wonder if the aux fan motor or fan clutch weak? (how to check without replacing again?) Is the high flow water pumps able to produce additional cooling capacity since the rad is slightly larger and restricted areas such as the t-stat housing and t-stat have been improved? In my head I compare it to exhaust systems, larger pipes are better until they are no longer matched with the dispacement of the engine. I have looked at the Hesco and FlowKooler and am leaning towards the Hesco since is if a completely redesigned casting instead of a few add-on paddles but I can't find any commparible tests just one sided "oh i put on on and its great" or "they cost too much they're a waste of money"
My thoughts is this a issue with being able to cool off the fluid in the rad or a fluid flow issue since I get a lack of cooling at idle and high freeway speeds? I wonder if the aux fan motor or fan clutch weak? (how to check without replacing again?) Is the high flow water pumps able to produce additional cooling capacity since the rad is slightly larger and restricted areas such as the t-stat housing and t-stat have been improved? In my head I compare it to exhaust systems, larger pipes are better until they are no longer matched with the dispacement of the engine. I have looked at the Hesco and FlowKooler and am leaning towards the Hesco since is if a completely redesigned casting instead of a few add-on paddles but I can't find any commparible tests just one sided "oh i put on on and its great" or "they cost too much they're a waste of money"