99 4.0 XJ
When Idle the gauges read 30 and 280-290.
when revved up a little the high gauge hits 300.
What would cause this high side to go so high is my question and what can be done to remedy it.I have a new accumulator and the hose with the schrader valve in it once I am sure on what to fix.I dont want to blow the compressor which I am sure will happen sooner than later.
I also get a (guessing) frozen evaporator inside because the AC gets warm after about 30 -45 minutes on the HWY..then cools back down when off for a while.
need some AC experts please
Thanks for any and all the help I have been given and reading on here.
Great forum and tons of helpful posts.
I have not posted in a while but did and learned a ton from you all.
Basically rebuilding and fixing everything on the XJ.
Thanks!

 

Mine does the same thing. I would love to know why.

 

I would check to makesure your auxiliary fan. Is working on that note and my understanding the faster. U. Rev ur engine also
makes. The Compressor work faster just my 2 cents. Check to see if your condensor coil gets hot my Dodge does it and wen I flip that fan it cools and works fine good luck tho man

 

I tested the fan and when it kicks on the high side goes down pretty quick but the fan turns on and off ONLY for the maintaining of the engine temperature. Is there a way to make the e fan kick on when you run your AC and stay on?

 

cooling part is fine, engine temp is fine, aux fan is fine and goes on when it needs to.

 

Your fan should. Come-on anytime. The AC is turned on u have some sort of problem. There

 

Your AC should turn that fan on to cool the condensor coil on your rig u have something. Going on there u. May want to run a wire to it from your acc so it comes on when ur rigs on. If the coil ain't cooling it wont cool on the evap side as far as I know which will do the exact same things you are stating blowing. Sticky air out etc

 

Has nothing. To do with your engine. Temp till it gets at boiling. Then it will warm up a bit

 

Try first bleeding. Both valves. Allthe way empty recharge. One can at a time could have junk in the system. To. I had to do it on a wrangler. Ended up blowing. Cold as %$#@ even at 115 degrees. Outside

 

was this post for me?
Saunders hijacked my thread and now I am confused with who is supposed to be reading what post.
hijackers..gets me confused.
thanks for the help so far.

 

the aux electric fan is actually there for two reasons;

1. when the coolant rises above 218*
2. when the a/c is on.

if your aux fan does not turn on when the a/c compressor is on (when the clutch on the compressor engages), you have a problem. it sounds to me that you have a wiring issue.

and i say again "but the fan turns on and off ONLY for the maintaining of the engine temperature" is 100% false. the mechanical fan is the primary cooling fan for the motor. the auxiliary electric fan is for the a/c and emergency overheating. dont believe me? look at an xj that had no a/c from the factory. it has no aux electrical fan.

 

Exactly. My point

 

2 separate circuits involved.
when you turn on the AC switch, the PCM raises the idle slightly and closes the AUX fan relay. I think the wire from PCM is blue. Check your FSM.

The other circuit is the temp sensor in the t-stat housing. It turns the fan on by signalling the PCM the engine is getting hot - the PCM then closes the relay - fan turns on.

if you want the fan to come on sooner - put a 1k resistor in parallel with the sensor - 1000 Ohm will turn it on at about 208 degrees. Stock is about 218 degrees.

Sounds like the "getting warm after a few minutes problem" is the placement of the AC expansion valve probe. The copper tube end MUST BE shoved all the way inside the cold coils of the evaporator - else it will ice up.

 

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