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Opel Astra G 1999: Radiator Fan Relay Location - Is it the Green One?

Mateusz03041994 30552 12
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  • #1 16692272
    Mateusz03041994
    Level 7  
    Posts: 34
    Rate: 3
    I warmly welcome.

    Gentlemen, I need help with relays. Where is the radiator fan relay?
    Is this the green one?
    Opel Astra G 1999: Radiator Fan Relay Location - Is it the Green One?
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  • #2 16692277
    milejow

    Level 43  
    Posts: 13047
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    Rate: 5105
    What engine is the climate?
    Company Account:
    Działalność własna
    Mętów 99, Lublin, 20-388
  • #3 16692295
    Pedros050
    Level 43  
    Posts: 17906
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    Hello. So green Is responsible for the operation of the radiator fan.

    Moderated By ociz:

    Not true.

    3.1.11. Do not send messages that add nothing to the discussion. They are misleading, dangerous or do not solve the user's problem.

  • #4 16692627
    Anonymous
    Level 1  
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  • #5 16693085
    Pedros050
    Level 43  
    Posts: 17906
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    Hello. If this is Astra G II then the relays are like that. Opel Astra G 1999: Radiator Fan Relay Location - Is it the Green One?
  • #6 16693336
    pusty20
    Level 26  
    Posts: 682
    Help: 66
    Rate: 212
    PITERRR wrote:
    Hello. And I'm already correcting the error rightly noticed by the Moderator review The relay to the radiator fan on the Opel Astra G is located here.
    link

    Even there is no question about the RADIATOR FAN RELAY. There is a fuse in the fuse box in the engine compartment. The author asks for the relay.
    The only answer that can be given here was already in post # 4. At least in this model and year.
  • #7 16693729
    milejow

    Level 43  
    Posts: 13047
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    pusty20 wrote:
    The only answer that can be given here was already in post # 4. At least in this model and year.

    It seems to me that in this year and model there was also a version without a cooling module, it was a version without AC.
    Company Account:
    Działalność własna
    Mętów 99, Lublin, 20-388
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  • #8 16693804
    Mateusz03041994
    Level 7  
    Posts: 34
    Rate: 3
    Autodata shows that it is.
  • #9 16693809
    Strumien swiadomosci swia
    Level 43  
    Posts: 27411
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    What is your problem?
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  • #10 16693867
    Anonymous
    Level 1  
  • #11 16694193
    Mateusz03041994
    Level 7  
    Posts: 34
    Rate: 3
    The fan turns off when the key is pulled out, overheats at higher speeds and the temperature light comes on.

    Added after 1 [minutes]:

    The controller controls the fans. After disconnecting the temp sensor, the fan switches on.
  • #12 16694253
    Strumien swiadomosci swia
    Level 43  
    Posts: 27411
    Help: 1403
    Rate: 6379
    Buddy, first check the fluid temperature and radiator temperature.
    Perhaps it is killed by soil and insects.

    Just not on the counter ... only with a thermometer.

    Secondly, do you have air conditioning and do you have 1 or 2 fans.

    Added after 8 [minutes]:

    Mateusz03041994 wrote:
    The controller controls the fans. After disconnecting the temp sensor, the fan switches on.

    This only proves that you don't understand anything about Opel electrical engineering.
  • #13 16694438
    ociz
    VIP Meritorious for electroda.pl  
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    Mateusz03041994 wrote:
    overheats at higher speeds
    And where is the connection with the fans here? Above 60km / h there is not even the slightest sense that the fan will turn on, because the air rush itself will work much more effectively.
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Topic summary

✨ The discussion centers on the location and identification of the radiator fan relay in the 1999 Opel Astra G. Users confirm that the green relay is responsible for the radiator fan's operation. Additional insights reveal that the fan module is located under the left bumper, and there may be variations in models, particularly those without air conditioning. Some users emphasize the importance of checking the fluid and radiator temperatures, as well as the functionality of the fan system, which may include a two-speed fan setup. The conversation also touches on the electrical engineering aspects of the vehicle's cooling system.
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FAQ

TL;DR: On a 1999 Astra G, the radiator fan is controlled by a front-mounted module, and above 60 km/h airflow outperforms the fan. "Above 60 km/h the fan makes little sense." [Elektroda, ociz, post #16694438]

Why it matters: Helps Astra G owners quickly locate the right component and fix overheating without chasing the wrong green relay.

Quick Facts

Where is the radiator fan relay on a 1999 Opel Astra G?

There isn’t a conventional fan relay in the engine-bay box to swap. Cooling is handled by a fan control module mounted under the left side of the front bumper. Access it from the wheel-arch or undertray area. [Elektroda, Anonymous, post #16692627]

Is the green relay in the engine bay the radiator fan relay?

No. A user suggested the green relay, but a moderator corrected the claim as not true. The fan is managed by the external module, not that green relay. [Elektroda, Pedros050, post #16692295]

Does an Astra G without A/C still use a cooling module?

Community experience indicates Astra G models used a two-speed fan with a control module, even on lower-output engines. “They all had a two-speed fan” is the prevailing view. Verify by checking under the left bumper for the module. [Elektroda, Anonymous, post #16693867]

Why does my Astra G overheat at higher speeds if the fan works?

At speed, ram air should cool better than the fan. Overheating suggests restricted airflow or heat transfer. Check radiator fins for dirt and insects, and compare coolant vs radiator temperatures with a thermometer, not just the dash gauge. [Elektroda, Strumien swiadomosci swia, post #16694253]

How can I quickly test if the fan failsafe works?

Unplug the coolant temperature sensor with the ignition on. The ECU should trigger the fan as a safety measure. If it does, wiring and fan power likely exist; investigate sensor data or the module next. [Elektroda, Mateusz03041994, post #16694193]

Where is the fuse for the radiator fan on Astra G?

The relevant fuse is in the engine-compartment fuse box. However, the fan’s switching is handled by the bumper-mounted module, not a simple relay inside that box. [Elektroda, pusty20, post #16693336]

What should I check first when diagnosing fan-related overheating?

How do I access the fan control module under the bumper? (3-step)

  1. Turn the steering left and remove left wheel-arch liner clips.
  2. Peel back the liner; look near the radiator’s left lower area.
  3. Inspect the module connector for corrosion, damage, or loose pins. [Elektroda, Anonymous, post #16692627]

My fan stops when I remove the key—normal?

Yes. On Astra G, the fan typically loses power with the ignition off. If overheating persists, focus on airflow restrictions, thermostat operation, or the control module’s performance while driving. [Elektroda, Mateusz03041994, post #16694193]

Does highway speed reduce the need for the radiator fan?

Yes. Above about 60 km/h, airflow through the radiator generally exceeds what the fan can provide, so the fan may not engage. This is normal behavior. [Elektroda, ociz, post #16694438]

What’s the typical fan speed setup on Astra G?

Astra G commonly uses a two-speed radiator fan controlled by the external module. Low and high speeds let the ECU match cooling to load, reducing noise and electrical draw. [Elektroda, Anonymous, post #16693867]

Autodata shows a module—should I trust it here?

Owners have confirmed that Autodata indicates a fan control module on Astra G, matching the bumper-left location reported by users. Use it to cross-check wiring colors and pinouts before testing. [Elektroda, Mateusz03041994, post #16693804]

I see a dashboard light linked with the fan—what does that suggest?

Some owners report a canister/fan-related lamp appearing with intermittent fan behavior. Treat it as a prompt to inspect the module, wiring, and connectors for faults or moisture ingress. [Elektroda, Anonymous, post #16693867]

What information should I provide when asking for help?

State engine code, whether you have A/C, and the number of fans. This determines wiring, control strategy, and component locations, speeding up accurate diagnosis. [Elektroda, milejow, post #16692277]
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