Car Over Heating Part 2!

[bjtheman1]

Since replacing the thermostat still having overheating issues, and it is a fan problem I can't figure out?

1)When I start the car and turn on the a/c to max and then to Hi the fan comes on.

2)When idling once the car hits 198 degrees (coolant temp) the fan kicks on. The Low-Speed Fan is set at 198 degrees and the Hi-Speed is set to 204 degrees.

3)Then with the A/C on for a bit the fan then stops thus overheating begins. The Lo-Speed fan will come back on only after the a/c has been turned off for a bit.

Also, I'm not sure if the Hi-Speed fan is coming on at all?

[JC316]

I'm going with the cooling fan relay.

[bjtheman1]

I'm going with the cooling fan relay.

I checked both hi-speed & Lo-speed relays in the fuse box and they seem to be working fine. Both click when power is supplied and showed continuity.

I do though have quite a bit of water in multiple areas under my car from the a/c.

[JC316]

I checked both hi-speed & Lo-speed relays in the fuse box and they seem to be working fine. Both click when power is supplied and showed continuity.

I do though have quite a bit of water in multiple areas under my car from the a/c.

I was having intermittent fuel pump issues with a nissan altima I had checked the relay and it tested good, so I changed the pump. The new one was having the same problem. Turned out that the relay would get hot, but stay engaged as long as the engine was running, after I killed it, it wouldn't engage again and my fuel pump got no power.

If it's not the relay, I would start looking for ground wire issues along the fan circuit.

[bjtheman1]

Took it for a drive today while datalogging. With the a/c off my coolant temps stayed under 198 degrees which is what the Lo-speed fan is set for, so I know it's working. Then I turned the a/c on and shortly after it started blowing warm air and my temps started increasing over 200 degrees. Once it hit 205 I checked and the fan was not running, so the Hi-speed fan is not coming on.

Why is it when the a/c is turned on all this happens? Fuk it's hot!

[JC316]

Took it for a drive today while datalogging. With the a/c off my coolant temps stayed under 198 degrees which is what the Lo-speed fan is set for, so I know it's working. Then I turned the a/c on and shortly after it started blowing warm air and my temps started increasing over 200 degrees. Once it hit 205 I checked and the fan was not running, so the Hi-speed fan is not coming on.

Why is it when the a/c is turned on all this happens? Fuk it's hot!

Do you have a custom tune that might be screwed up? When the A/C is commanded on, the low speed fan should be on constantly. If that isn't happening, then it could be a PCM issue.

[bjtheman1]

[QUOTE=JC316;1142832]Do you have a custom tune that might be screwed up? When the A/C is commanded on, the low speed fan should be on constantly. If that isn't happening, then it could be a PCM issue.

Yes, I've had a Custom tune for years now so I don't believe it should be causing this. Also, the fan does come on when I turn the a/c on

[JC316]

[quote=bjtheman1;1142846]

Do you have a custom tune that might be screwed up? When the A/C is commanded on, the low speed fan should be on constantly. If that isn't happening, then it could be a PCM issue.

Yes, I've had a Custom tune for years now so I don't believe it should be causing this. Also, the fan does come on when I turn the a/c on

Ok, when it starts blowing hot air, is the A/C compressor still turning? If not, the pressure combo switch may be going bad and interfering with the fan operation.

[Blackpony]

Sounds like a possible bad relay for the high speed fan

[KBScobravert]

Refresh us, what year is it? If it uses a CCRM it may be bad. The high speed fan should come on with the A/C compressor or temp regulated as you know through the ECU.

[JC316]

Refresh us, what year is it? If it uses a CCRM it may be bad. The high speed fan should come on with the A/C compressor or temp regulated as you know through the ECU.

Pretty sure it's his 07, which doesn't use the CCRM. It does have some type of control box, but I don't know if it can cause those problems.

[bjtheman1]

Well, damnit! Hi-speed fan still doesn't come on. I was datalogging today and some of my parameters was both fans. When each one would come on it'd show on my screen. What is odd the hi-speed fan on my data-log screen showed on but it wasn't running????? The Lo-speed worked fine though.

[JC316]

Well, damnit! Hi-speed fan still doesn't come on. I was datalogging today and some of my parameters was both fans. When each one would come on it'd show on my screen. What is odd the hi-speed fan on my data-log screen showed on but it wasn't running????? The Lo-speed worked fine though.

Have you tried changing the cooling fan itself? Could be something internal thats heating up. This might be a case of occams razor.

[bjtheman1]

Something else I just noticed reviewing my data-logs....when the low-speed fan comes on the a/c compressor does, but when it showed the hi-speed fan on (when it wasn't) the a/c compressor did not come on???

[bjtheman1]

[quote=JC316;1142863]

Ok, when it starts blowing hot air, is the A/C compressor still turning? If not, the pressure combo switch may be going bad and interfering with the fan operation.

I think you might be right, since I now know the a/c compressor doesn't come on with the hi-speed fan.