Marcouscous
New member
I was hoping someone would be able to give me some guidance on this as I can't figure out what's going on!
I have a 2005 VW Touran 1.9tdi PD105 (pdi) BKC
Last summer the Air Conditioning in it died suddenly. There were no other problems and I couldn't afford to fix it. So I left it. This summer, I have had enough of sweating so decided I would get it fixed. I've only got a basic OBDII code reader, so I borrowed my neighbours fancier one. It said that the AC low pressure sensor was dodgy, so I replaced it with a new one as it was only ~£10. It fixed the AC!
But... I now have a load of other issues.
The symptom is that the radiator fan is running on full blast all the time - including when the engine is cold and only the ignition is on (not the engine). It spins up to full blast for 30 secs, then slows right down before spinning up again. It does not stop so long as the ignition is on. I have done the obvious thing of turning the AC off as I know this would cause the radiator fan to spin up. As a result the engine struggles to get up to temperature on cooler summer days, and the engine temperature does drop down from 90degC on slower roads. The engine does not overheat.
My neighbours code reader had also given some other codes which looked related to this problem (my code reader also gave the same codes but without as much detail). They were:
Then I thought that the new AC pressure sensor must be dodgy, which I thought was proven as when I disconnected the wires into AC pressure sensor, the fan doesn't turn on when on ignition only, and the AC stops working. The new one arrived and I just fitted it but the problems still persist. I ran the codes again, this time on my code reader and it gave the following:
What's going on?!
Thanks, Marcus
tldr: AC pressure sensor is causing radiator fan to spin on full blast and throwing up loads of codes.
I have a 2005 VW Touran 1.9tdi PD105 (pdi) BKC
Last summer the Air Conditioning in it died suddenly. There were no other problems and I couldn't afford to fix it. So I left it. This summer, I have had enough of sweating so decided I would get it fixed. I've only got a basic OBDII code reader, so I borrowed my neighbours fancier one. It said that the AC low pressure sensor was dodgy, so I replaced it with a new one as it was only ~£10. It fixed the AC!
But... I now have a load of other issues.
The symptom is that the radiator fan is running on full blast all the time - including when the engine is cold and only the ignition is on (not the engine). It spins up to full blast for 30 secs, then slows right down before spinning up again. It does not stop so long as the ignition is on. I have done the obvious thing of turning the AC off as I know this would cause the radiator fan to spin up. As a result the engine struggles to get up to temperature on cooler summer days, and the engine temperature does drop down from 90degC on slower roads. The engine does not overheat.
My neighbours code reader had also given some other codes which looked related to this problem (my code reader also gave the same codes but without as much detail). They were:
- 18049 - Please check DTC memory of A/C ECU P1641
- 18617 - Coolant Temp Sensor on Radiator Outlet (G83) problem
- 16502 - Engine Coolant Temp Sensor (G62): Signal too High
- 01314 - Engine Control Module: No Communications
Then I thought that the new AC pressure sensor must be dodgy, which I thought was proven as when I disconnected the wires into AC pressure sensor, the fan doesn't turn on when on ignition only, and the AC stops working. The new one arrived and I just fitted it but the problems still persist. I ran the codes again, this time on my code reader and it gave the following:
- 16502 - Engine Coolant Temp Sensor (G62): Signal too High
- 19558 - Motor for Intake Manifold Flap (V157): No Signal
- 19557 - Motor for Intake Manifold Flap (V157): Open or Short to Ground
What's going on?!
Thanks, Marcus
tldr: AC pressure sensor is causing radiator fan to spin on full blast and throwing up loads of codes.