Long story short, my xj overheats when the AC is on only. Whe the ac is of temp hardly reaches 210 normaly 200. Outside temperature goes above 100 normaly and having the ac off is not an option. I have checked if electric fan runs while the ac is on and it does, actually the e fan is always on since it is conected direcly to the battery. I have put a new zj fan clutch and that is working great so Im not really sure if the e fan is blowing as strong as it should or if the condenser is making the rad hotter, already tried cleaning it but same problem.

 

Sounds like a radiator issue to me. ever replace the cap?

 

Radiator is brand new 2 row. Water pump is brand new as well same as the thermostat and tstat housing. The rad cap says 1.3 bar which is ahout 18psi. The cap came with the rad but I have not changed it.

 

test the new cap.

 

Do you suggest a 18psi or should i go a little bit highter

 

NOT higher!! I think 13 is stock, but some folks use 16.

 

Have you checked that efan is blowing air into the engine compartment and not the other way around, as you mentioned it is connected directly to the battery and not the OEM wiring it could be incorrectly wired (happened to my brother once)

 

Excellent thought!!!!!

 

Yes it is blowing to the engine compartment. Id have to try changing the rad cap since it is a 18psi cap, some say it has to be lower

 

 

It is brand new

 

An 18lb cap is too high. The higher the pressure, the hotter it will run. Switch to a 16lb radiator cap. Use a standard cap, not the ones with the lever on it. The only brands i trust are OEM or Stant (this includes thermostats). The only other things i can think of is the a/c seizing up a bit once engaged making the engine work harder, or the block needs a flush, or the gauge is off for whatever reason. Check the temp with a IR gun pointed at the thermostat housing to be sure its reading properly.

 

So I have replaced the rad cap for a 16psi one, also replaced the efan and tsta housing and now im using a 195f tstat, put on some silicone hoses as well as replaced the water pump. Im running a 3row rad also put a transmission cooler and temp is still going up to 230f. I bought an IR gun and pointed it at the tsta housing and says temp is 211f so maybe my gauge is not giving good readings, besides that how high can the temp go before the engine goes off by itself?? Im thinking i should not go as high as 230.

Thoughts?