Coolant Temp Warning - pegged to red. Holy crap. - Page 10

Overboost · #91 06-07-2019, 10:46 AM

Quote:

Originally Posted by Meestahbig

I did not notice the electric fan turning on at any time when looking at the fans in the overheat state. I will take a look. Does that fan do anything when the AC is on? thanks again for your help specifically.

Glad you got it sorted. Hit the tunnel again for total validation.

The electric fan should run whenever the A/C is on.

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andrewwynn · #92 06-07-2019, 10:52 AM

Doesn't "always run" only when needed:

Code:

 The auxiliary or a/c condenser fan in mounted to the front of the radiator. The auxiliary fan for this vehicle is controlled by the ECM and does not use relays. The auxiliary fan request comes from the IHKA control module via the K-Bus. The fan speed request is based on the refrigerant pressure sensor input to the IHKA. Additional factors monitored by the ECM that influence fan operation are: Radiator outlet temperature sensor (exceeds the preset temperature), Vehicle speed, Battery voltage level. The auxiliary fan motor incorporates an output final stage that activates the fan motor at variable speeds. The output stage receives an output signal (pulse width modulated 10-100Hz) from the ECM, which activates the motor.

When it's hot out it might always run. When it's 75F it might never run. Like I mentioned above I had the AC running it was maybe 75F outside, I stopped the mechanical fan with some cardboard and within seconds the electric fan kicked on. When I let the mechanical fan free the electric fan stopped within seconds.

Overboost · #93 06-07-2019, 11:03 AM

Correct Andrew. Only when needed and will assist the A/C condenser cooling when hot.

andrewwynn · #94 06-07-2019, 11:32 AM

I just wanted to make sure people don't think their fan is broken because it doesn't immediately turn on with the AC.

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Overboost · #95 06-07-2019, 12:13 PM

If OP wants to check his fan operation he can disconnect the high pressure switch and the fan should go full song

Meestahbig · #96 06-07-2019, 01:06 PM

overboost, I recall doing that once before... but which "fan" are you talking about? the electric fan, right? too many fans, LOL

Meestahbig · #97 06-07-2019, 01:08 PM

$500+ for the Aux fan, dang... if mine is broken, not sure I would replace it knowing it wont cause my car to break down.

andrewwynn · #98 06-07-2019, 01:16 PM

There are decent third party fans available. Yes he's talking about the electric fan but I'm not sure which connector needs to be pulled to force it to run. He said high pressure switch maybe means coolant output sensor. If the DME can't read the temp it may assume it's max and kick on the fan.

Meestahbig · #99 06-07-2019, 01:26 PM

Maybe that is what I did last time, pull off the coolant temp switch to see if the engine fan would blow like mad... ill check out the electric fan.

later today I will be in the Brooklyn Battery tunnel, it is about twice as long as the Lincoln Tunnel. I don't think the temp will rise, I am pretty sure it is fixed now.

I think the AC has been weak, thought it just needed a little recharge, but maybe the fan is shot. hmmm.

Overboost · #**100** 06-07-2019, 01:35 PM

Open the hood, look straight down on the passenger side next to the A/C compressor. The hard line going to the compressor running along side the frame rail has a high pressure switch in it. Start the engine and disconnect the plug on the sensor and the fan will start and within 10 seconds it is wide open.

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