engine hotter when air conditioner on at idle

The blower speed has no bearing on temperature but the air conditioner compressor adds load to the engine which can increase the temperature. This could mean that the radiator has marginal cooling capacity or even that the water pump is not circulating sufficiently but that would be rare. What is even more likely though is that the cooling fan has lost high speed as this is a two speed fan system.

yes i never heard the fan goes to the high speed . there is only one speed. when i turn the air conditioner on and the engine is cold the speed is the same when the radiator fan goes on. is the first speed works with twelve volts and the second speed works with twenty four?

what I want to know is; does the PCM send a twelve volt supply to the low side brushes for low speed and twelve vol to the low and high side brushes for high speed?
Or, does it send twelve volts to the low side brushes for low speed and twelve volts to the high side brushes for high speed?

The fan itself has two different internal circuits. One of them has a resister built into it so you have to test the fan at both inputs.

so if a jump one of the relay it should run low or high and if i jump the other relay it should also runs low or high. is it correct?

No, you cannot jump the relays. They are internal to the fuse box and not accessible or serviceable. If they are bad you have to change the whole fuse box which is called the TIPM (Totally integrated Power Module) You can apply power to the individual wire inputs at the fan. The diagram gives you the wire colors.

the relays are at the front of the engine on the cooling fan. there are no visible relays in the tipm. they did that for 2006 and up. i did jump them before because i had problem with one of them .when the ac was on the fan did not engage and i had to replace the relay.

this is a link from a youtube video
https://www.youtube.com/watch?v=MNW7cjlEObE

According to the factory wiring diagram for your vehicle, they are in the TIPM. That is what I go by, not a youtube video for a different year car that some guy made. As I stated, they wouldn't be visible anyway.

If the diagram is wrong and the relays are external, that's fine but you can't rely on the fuses to them being good so jumping the relay won't work unless you have verified that.

yes i have verified there are two relays for the fan on the fan itself. i bypassed the relay in the past i jumped the two thick red wires and the fan came on

You need to be very careful doing that. If you happen to jump the wrong 2 wires, you will trash your PCM in a heartbeat.

yes sir thank you
.so if i jump one of them the fan should run on low speed and when i jump the other it should run on high speed right?

Assuming the relay still has power supply, yes.

when I jumped both relays the fan turned on with the same speed . i did not notice difference between both of them .when the engine was cold i turned on the ac the fan turned on .when i removed the relay it stopped turning. i put back the ac relay and turned off the ac after i let the car idle with ac off the fan came on. so i guess both relays are good and both circuit fan1 and fan 2 works. the question is why the fan has only one speed?

I went to a 2005 to see a system with 2 external relays. The speeds are built into the motor with a resister on one of the feeds inside the motor. The yellow wire is high speed and the dark green is low speed.

I have another question. the p0882 code came back yesterday. i thought i fixed i was a loose wire in the tipm the one coming from the computer to the tipm i checked it today ( i wiggled it )it was good. however when i wiggled the pcm harness everything went crazy the antitheft light was flashing . the PRND letters had squares arround them. and my scantool was not unable to communicate with the computer.


my question is was is safe to wiggle the computer connector. and why everything went crazy?

You found the source of a problem somewhere in that harness. I would unplug it at the computer and see if there is any corrosion at the plug

so was is safe that i wiggle the computer connector?

( i do not want to damage the computer). i unplugged the negative battery and the connector and plug it back and the crazy things went away

so i need to look for green staff on the harness connector right?

Look real close. It won't be real obvious. Just unplugging it and plugging it back in may resolve it.

do i need to disconnect the battery before i unplug the computer connector ?

No, but it wouldn't hurt. Make sure the key is off though.

i checked the connector its not corroded.
when i wiggle and had crazy thing going on the key was in run position. do i need to redo the test or i would damage the pcm?

today the car was idling with the ac on when it starts to shake and the check engine light came on
i checked the codes it was i think 9 of them . the one i remember are U0001 U0014 p700. the car ran fine since august 7 until today. Today i wiggled pcm connector #4 the car did not starts and the security light was flashing, the battery light came on too. i had to disconnect the negative battery after that the car stated