help overheating 2000 jimny

[devsingh]

No cat , and barrel seemed good to the muffler people.
i am just totally clueless!

[devsingh]

Just had an electronic distrubutor installed and timing checked.
jimny working a hundred times better, more power, generally better
but still overheating
by the process of elimination, we know:

head gasket changed though good
water pump changed though good
radiator flushed , system burped, radiator replaced with new
thermostat removed
new fan and shroud installed and working correctly
fan on with ignition on a relay
engine timing and distributor good
not loosing water or burning oil
engine starts with one turn of ignition
replaced original sensor
after market gauge and sensor combo installed

Observations:
Jimny overheats when driving with ac on.
vehicle is normal when idling
overheating only occurs in daytime whilst driving (motion)

[devsingh]

only thing i can think of is the radiator fan is half inch away from engine . maybe the rad is too small
rad specs:
19" in lenght
17" height
2" thick
locally built brass and copper materials
double core

replaced with
same dimensions as above
single core aluminum and plastic march (new model) radiator

anything bigger can't fit so i'm thinking two smaller radiators or original and a smaller
thoughts anyone ?

[devsingh]

installed a hood today, still no change

[devsingh]

can this 75 degree bend on the exhaust be the problem ?
it would explain the overheating with AC on whilst driving and the keeping cool whilst idling in traffic

[Big Z]

That bend should be a non issue. Do the vacuum gauge test to verify.
Given the age of the engine... try a bottle of redline si1.
It may be remotely possible that pre ignition may be occuring leading to overheating

[gt4tified]

can this 75 degree bend on the exhaust be the problem ?
it would explain the overheating with AC on whilst driving and the keeping cool whilst idling in traffic

I would worry more about that welding (for want of a more appropriate word) than the angle of the bend. In any event, that would never cause such a problem.

[devsingh]

changed the bend with smooth 60 degree bend, still overheating, no change

[devsingh]

had this installed thinking the engine compartment was too cramped, still no change, overheating

[Big Z]

Looks good though.
Give the headlights a polish.

[DatManiac]

Can a overheating transmission cause it? That is if you are using the tranny oil cooler on the radiator. Just another guess, cuz it seems like you covered everything else.

[devsingh]

seems to be worth a try , what do you recommend, put a separate tran cooler ?

[Hyper V Racing]

This is just too crazy!!!!

I remember my old 120y had a radiator with a 13" x 19" core. It was a newly built 3 core radiator.
The fans were only on while idling.... most of the times. While running(eg.highway) the electric fans would be off (had this tested with a bulb in cabin). My car had more tendencies to heat as i was running a t28 turbo at 6 psi on the 1500 engine.

What i can tell you is that the original radiator which was almost half the size as the original did exactly the same thing as what your vehicle is doing....
On changing the engine from the 1200 to 1500 I remember we saying of how the crappy the engine is re: overheating, and it needed a large radiator with the engine overheating this much more with a cc increase of only 300.

So this is the question-are you 100% sure the radiator is not blocked in some of the cores?.

Rodney

[devsingh]

absolutely sure, had it opened and cleaned and also bought a radiator from new model march dimensions 19"x17" same problem.
just installed an external transmission fluid cooler and went on a test run, same thing.]
OVERHEATING
i know the radiator id good cause i even tried changing and same results

[SweeP]

When yuh take out the radiator yuh ever run ah hose from the pipe to the engine(make sure yuh have good pressure) an flush dat out as well before connecting back the radiator?? Ah had ah prob like dis once an it actually had blockage in the engine cuz bits of rust came out(apparently at idle water would circulate but when driving an water didn't used to circulate as fast as enough an dis use to cause overheating.I don't knw if dat cud be de same prob as yours buh it aint go hurt to give it ah try.

[devsingh]

did alot, latest was yesterday but i'll do it again today

[devsingh]

tranny cooler

[devsingh]

one thing i noticed, when the car first starts in the morning, it takes quite some time for the oil light to switch off approx five minutes, the oil level if good everytime i check ( always)

is it possible that the oil is too thick (50 body)
today i'll put in 20W 50
hope for the best

[Big Z]

Yeah.. that ent right.
Drop the oil pan and check for a partially blocked oil pick.
Check/replace your oil filter.
20W50 is fine in that engine.

[Hyper V Racing]

Yeah.. that ent right.
Drop the oil pan and check for a partially blocked oil pick.
Check/replace your oil filter.
20W50 is fine in that engine.

Second that..

[SweeP]

devsingh, so when yuh start the vehicle fuh dat 5mins of the oil light being on does the engine idle normal or sound like old noise???

[gt4tified]

devsingh, so when yuh start the vehicle fuh dat 5mins of the oil light being on does the engine idle normal or sound like old noise???

bearing knock?

[devsingh]

normal, no noises or anything but if you give it a little gas, the light come off for a while comes back on then stays off. i'll definitely be changing oil soon. the engine currently has 50 body oil ( mechanic not me)
i also installed a clutch fan and going for a test run.

[devsingh]

clutch fan is a lot more powerful than the electric fan (new model march 2 speed)
there's a lot more space between the condenser and radiator

[devsingh]

Cost so far:
new fan and radiator 1000
serviced existing radiator 300
changed water pump 350
changed head gasket 900
installed transmission cooler 300
installed hood scoop 400
replaced condenser fan 350
replaced sensor 200
installed sensor/gauge combo 300
replaced fluids 550
coolant like crazy 250

Total thus far $ 4,900

[devsingh]

Great news people,
PROBLEM SOLVED
clutch fan $250

no overheating whilst driving with ac or on the highway

overheating when idling , but that's just a shoud to be installed

thanks all for the advice and thoughts

[SweeP]

ohhh okk dats good news,buh dat does hutttt yuh when yuh knw yuh spend all dat money an is something simple!!look on the bright side yuh jeep go be working better dan before.

[devsingh]

yup lot of upgrades

[Big Z]

Well thats great news.
On a side note... it shows that the 120y engine is not the best of designs.
It needs too much to keep it cool.... your original cooling was good for a modern engine with twice that power.

[devsingh]

seeing that it was designed over thirty years ago, it was okay. but seriously, thanks for all the advice