Whats up guys, just like the title says, the outside temp is over 100°f so i have to turn the a/c on but as as soon as i do the temp starts to rise and when i turn it off it goes back to normal temp, the fans turn on and my radiator is full of coolant, what could it be i dont think is the thermostat or water pump, car runs perfect as long as i dont touch the a/c any help is appreciated. Thanks

 

The grounds man. Check you grounds!

The one nearest the battery on the head is the culprit! Run a 4awg wire direct to it.

 

Don't turn the A/C on full.

 

When you say the temp is rising, how far are they going?

 

^^^I dont let the needle go pass 3/4 i turn it the a/c of right away.

 

Is this only when at idle ? Does it do it at 45-60mph ? The condenser is in front of the radiator thus being really hot and transfering all that to the radiator. Also the fan is not pulling enough air.

 

Shroud on the radiator fan? Aftermarket Fan on the AC condensor?

 

classic sign of sticking thermostat on any car also check if all fan kick in when you have ac on, temp should not affect a bit regardless of low or full blast AC

 

When the car is parked it does not overheat only when the car is in motion, specially when on the freeway.

 

what position you consider "overheat"..since on park position you do not overheat it tells your fans are kicking no problem, check your thermostat

 

I dont think its the thermostat because it overheat regarless.

 

your thermostat could be getting stuck closed.. Worth checking

 

Yea, I'm still thinking thermostat too, don't assume the thermostat is good, its simple to check it. I would just pull it out and check it. For how cheap the part is you might as well rule it out and replace it. Unless you're not mechanically inclined at all, then I would recommend just taking it somewhere.

 

I was having the same issue (kinda). My temp would start rising randomly if I was at a still or moving. I checked the engine bay and saw a ground was no longer connected. I replaced the ground and now it doesn't overheat anymore. It's worth a check.

 

Interesting...