AC flakes in car line

[camino70]

I don’t normally pick the kids up in car line, but when I do twenty minutes idling, the ac light starts flashing and stops operating.

For some reason i thought maybe flakey relay, which i replaced with new oem.

The ac’s been fine driving for hours at a time, but picked kids up in car line yesterday. Sure enough twenty minutes in = flakey

It wont work again till it all cools down.

Three hours into drive now, everything operational

 

[Import Driver]

I think the a/c shuts off when the engine temp goes above 220° F. My guess is that your engine might be overheating. Check your engine coolant first.

 

[bloc]

Did the relay actually test bad or did you just change it preemptively?

 

[TeCKis300]

Do you have any mods? Armor, underbody armor? Engine covers?

 

[camino70]

Did the relay actually test bad or did you just change it preemptively?

Preemptive.

 

[camino70]

Do you have any mods? Armor, underbody armor? Engine covers?

Negative

 

[camino70]

I think the a/c shuts off when the engine temp goes above 220° F. My guess is that your engine might be overheating. Check your engine coolant first.

I’ll make sure I keep an eye on temp. Thank you

 

[TeCKis300]

Negative

Gotcha. I've idled for hours in the hot desert off-road crawling with friends and the one thing that the 200-series is hugely robust with is cooling robustness. These things were designed to hold up in the harsh Middle East climates. Never had a problem (unlike buddies F150 Raptors).

Get an OBD-II reader that can report the engine coolant temp.

Has the vehicle ever been in an accident? Does it have all the OEM gaskets and shrouding in place?

Might want to check the cooling system. How many miles do you have and has the water pump ever been changed? Could also be things like the cooling fan clutch, pressure cap, A/C condenser and radiator for contaminants/bent fins/mud.

 

[camino70]

No prior accidents, replaced radiator not too long ago (foam in place) coolant replaced somewhat frequently.
No fins look messed up, dirty

Carpool lane today, coolant temp went from 85 ->90. Ac didn’t flake out today.

 

[dubaicruiser]

He, Any update? I have a similar problem

 

[camino70]

He, Any update? I have a similar problem

Sorry dubai, I missed this message. No real updates I think I was lucky through the summer and didn't really idle anywhere. Now that I'm using the ac again this year I have the problem exhibiting much quicker. I removed the condenser fan, it spun, but with no force, I think simply from the suction of the radiator fan. Direct 12v to it and it doesn't spin. I replaced it and went to test after a short drive, again, not much force. I'm not getting 12v to the connector, no blown fuses, good ground and I'm currently troubleshooting.

 

[camino70]

I swapped the CDS relay with the fog lamp relay, the fog lamps work with both relays. From condenser fan connector I reconfirmed ground connectivity successfully. I also successfully tested connectivity from the 12v connector to the top spade of the relay, pin 87. I have two 12V at the relay, pins 30 and 86. I have no ground on pin 85 from ecu. The fan runs great when pin 87 gets jumpered to 12v.
Where am I looking from ecu to pin 85?
Thoughts on short term jumper, run all the time with truck on through 30/87 jumper or possibly from MG CLT so it's on when the AC is on?