Question about 1995 Chevrolet Corvette

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1995 chevy corvette

My electric cooling fan only works when the a/c is on

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  • greyhnds29 May 03, 2009

    I have a 95 Corvette and am looking for a solution for the coolant system. My car runs at a normal temp range only when the A/C is on. Reading the GM repair manuals it notes three coolant relays one for each fan assy and a third which appears to control low and high temp ranges. I've also read where the ECM can get reprogrammed at a GM dealership so that it kicks in automatically at lower temps. If I don't keep the A/C engaged the temp climbs to est. 230f before both fans kick in which can't be normal. Is it time to simple replace all three relays and move on..........

  • yadayada
    yadayada May 11, 2010

    I have a 96 Corvette, and the cooling fan does not come on until 235 degrees F (this is normal), just wanted to check and see that you are aware of this? do you have a wscanner thqat can read live data so you can watch the ECT readings?

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The electric fan will not come on until the gauge is around 225-230. When the air is on the fan works constantly. That is why your car runs cooler with the air on. I have found that in stop and go traffic it is best to run the air. Mid America corvette sells a unit that will kick your fan on at a lower temp if you desire. I hope this helps.

Posted on Feb 13, 2009

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ourhowse
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SOURCE: 1976 chevy corvette stingray cooling fan vibrates

Better check to see if the nuts are still tight on your fan.

Posted on May 31, 2009

6ya6ya
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The primary radiator fan does not come on.


Check Maxi fuse #3 60 amp in the under hood electrical center #1 .This is power for the #1 cooling fan . Also check the #1 fan control relay in the same under hood electrical center .
These vehicles use 2 360 mm (14.2 in) cooling fans to aid air flow through the radiator. Electric motors drive the cooling fans. These motors are attached to the radiator. Motor size varies with each engine option.
A coolant temperature switch activates the fan motors. This switch regulates voltage to the cooling fan relay. This switch operates the fan whenever the engine coolant temperature exceeds 110°C (230°F). For location and diagnosis, refer to Electrical Diagnosis. A transducer can also activate the circuit, depending on the A/C compressor head pressure going to the condenser.
The engine cooling fan relays provide the high current required for the cooling fan motors using a low current signal coming from the Powertrain Control Module (PCM). This signal is a function of various inputs.
Refer to Electrical Diagnosis for further information and diagnosis of the cooling fan relay.
Electrical Center #1, Underhood (U/H)
RH side of the engine compartment, forward of the strut tower

Jun 08, 2016 | 1996 Pontiac Grand Prix

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Where can I get pictures of the fans in the engine compartment?


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Dec 21, 2015 | 1996 Chevrolet Cavalier

1 Answer

I have a 94 plymouth sundance 6 cylinder the fan that cools he radiator is not working what is he problem


3liter 6cyl? (5 or 6 engines used, 2.2L up to 3.8)
in all cases (engine rad cooling fan) (seems not)
clutch fan failure? (if old mech. type fan) replace it.
if electric fan?
  1. bad control sensor.
  2. bad controller
  3. bad fan relay
  4. bad fan
  5. bad wire/ connections between them.

what we do is get it hot and see if fan works at the FSM stated trip temperature. (225F is a guess, ) alldata.com has this number too.
if the fan is dead, we check voltage the fan, 12v ? fan is dead.
0 volts? yes, then control is bad.
the work backwards from here, finding true cause. easy huh?
any cheap voltmeter made works .

the ECT is for the engine. EFI system. TBI?
but the Fsm states.
All models equipped with electric cooling fans use this sensor to control the cooling (radiator) fan operation.

i dont have the wiring set for this car.
try alldata.com and use that for fan wiring ,etc.

Mar 12, 2014 | 2003 Suzuki Aerio

1 Answer

Passat code P0480


P0480 VOLKSWAGEN - Cooling Fan 1 Control Circuit Malfunction

Possible causes- Fan control relay harness is open or shorted
- Fan control relay circuit poor electrical connection
- Fan cooling fan harness is open or shorted
- Fan cooling fan circuit poor electrical connection
- Faulty fan control relay
- Faulty cooling fan 1
- Faulty ECM (very unlikely)

Apr 11, 2012 | 2007 Volkswagen Passat Sedan

2 Answers

Which cooling fan is the primary on a 99 jeep grand cherokee ???


The main cooling fan on this 1999 jeep cherokee, the main fan all depends.

These jeeps come with diffrent fan set ups. Here are a few, the first may be a fan driven off the motor by a fan belt and a another fan which is electric. the primary fan used for cooling is the fan that runs off the engine with a belt. the other electric fan is more the air conditioning system, this fan is used for cooling the condensor mainly. the engine driven fan is for the cooling system.


Another system fan set-up on these jeeps would be the motor driven fan by belt with another electric fan in front off it, the diffrence between the first and this one is that the first fan system is side by side and this one is set-up one in front of the other but the concept is the same, the fan driven by the engine is mainly for the cooling of the engine coolant and the electric fan is for air conditioning cooling.

In both set-ups the electric fans also help the cooling system but are mainly used for the help in cooling when the a/c is turnned on, the a/c condensor builds up heat the same as the radiator does, one fan is unable to cool both the radiator and the condensor, this is why some cars have two fans.

Good day, hope this is helpful,

Mar 18, 2012 | Cars & Trucks

1 Answer

Electric cooling fans not working at any time while vehicle is running causing temp gauge to read high.while vehicle is moving temp gauge will go to normal.as soon as you stop temp gauge begins to...


{: ) You didn't mention the model of your vehicle. Anyway, I admire your way of observation, and I'm sure you got the analogy by now. When the car is running, the engine rpm is higher, and so with the water pump, plus the wind velocity passing thru the radiator fins, can give sufficient engine cooling without the electric cooling fans. But when your vehicle stops, like sitting on a traffic, the engine rpm is lower, and so with the water pump, and there ain't enough wind to help.
This is why the electric cooling fans are very important in maintaining engine temperature at normal levels in any driving conditions.
Basically, the cooling fans are controlled by the engine control module (ECM). The ECM monitors input from various engine sensors and then will give an output signal based on its programmed instructions. The output signals will energize the corresponding fan relays, be it high or low speed.
You can start by checking first the easy ones like the fuses and relays. Cooling fans usually have square top transparent windows. Check the the underhood fuseblock label to locate. Might as well check all fuses to be sure.
Check the cooling fan relays for signs of overheating, and also for loose terminal seating.
Check the cooling fan if stuck, and also check the connectors if burned or melted. To rule out a defective cooling fan motor, you can check for continuity, or you may apply direct voltage to the two wires on each fan.
The mostv frequent cause of cooling fan malfunction is on the fuses, relays, and connectors.

Jul 22, 2011 | Chevrolet SSR Cars & Trucks

1 Answer

2005 grandcherokee 4.0 Overheats when idleing in traffic. WILL IMMEDIATELY COOL DOWN WHEN RPMS ARE INCREASED TO 3500 FOR 1-2 MINUTES. nO WATER PUMP NOISE, NO LEAKAGE, COOLANT LEVEL IS oK, ELEC FAN OPERATES...


Hello and welcome, it sounds like you need to replace your fan clutch. Your Jeep has 2 cooling fans 1 runs off the engine the other is electric. Before replacing the fan clutch you need to make sure the electric cooling fan is working just turn on your a/c and it should kick on. If it does then the problem is your fan clutch is it doesn't then your electric fan is most likely bad.

Jun 23, 2011 | 2005 Jeep Grand Cherokee

1 Answer

Cooling fan burned up


Get a new fan motor and blade from GM or from an aftermarket supplier.

GM parts are usually better than the aftermarket ones, though for fit and functioin.

May also look into checking the relays and harness. If the terminals of the fan show they are getting current, then the motor will have to be replaced if not turning or obviously burnt.

Good luck on this repair.
---

Inspect/Replace

CAUTION
The fan that draws cool air across the radiator can be driven by either a belt or electricity. Rotating fans can be dangerous. Some are controlled by an automatic switch and can start unexpectedly. When working on electric fans, keep in mind that electric cooling fans should be disconnected when working around them.
When replacing a radiator fan motor, always refer to the vehicle's service manual. The following is a general guide for cooling fan replacement.

  • Disconnect the negative battery terminal at the battery. This is necessary on vehicles using electric fans, but some vehicles may require the relocation of the charging system components.
  • Drain the cooling system.
  • Loosen or remove the hose clamps, then remove the upper and lower hoses from the radiator.
  • Disconnect the transmission cooling lines and plug them off, if equipped.
  • Disconnect the electric fan motor connector, if equipped.
  • Remove the fasteners attaching the fan module to the radiator.
  • On some vehicles equipped with air conditioning systems, it may be necessary to discharge the system. This is the case if the radiator and condenser can not be separated in the vehicle.
  • Remove the upper radiator cross member or mounts.
  • Disconnect and plug the air conditioning lines at the condenser, if needed.
  • Remove the radiator and fan module as one unit if possible.
  • Separate the fan module from the radiator.
  • If required, separate the radiator from the condenser.
  • Remove the old fan module.
  • Install the new fan module onto the radiator.
  • Reattach the fasteners attaching the fan module to the radiator.
  • If equipped, connect the electric fan motor connector.
  • Reinstall the radiator.
  • Refill the cooling system.

Oct 29, 2010 | 1997 Chevrolet Cavalier

1 Answer

How to change the radiator fan?


Electric Engine Fan - Fan Switch

Removal & Installation
2.7L Engine
  1. Disconnect negative battery cable.
  2. Partially drain cooling system.
  3. Disconnect the electrical connector .
  4. Remove engine coolant sensor from coolant outlet tube .
To install:
  1. Apply thread sealant to sensor threads.
  2. Install engine coolant temperature sensor into coolant outlet tube.
  3. Tighten sensor to 20 ft. lbs.(28 Nm) torque.
  4. Connect electrical connector to engine coolant temperature sensor .

3.2L And 3.5L Engines
  1. Disconnect negative battery cable.
  2. Partially drain cooling system.
  3. With the engine cold, disconnect coolant sensor electrical connector.
  4. Remove sensor.
To install:
  1. Install engine coolant temperature sensor.
  2. Tighten sensor to 20 ft. lbs.(28 Nm) torque.
  3. Attach electrical connector to sensor.
  4. Connect negative battery cable.
Removal & Installation
  1. Disconnect negative battery cable.
  2. Partially drain cooling system.
  3. Remove upper radiator hose.
  4. Disconnect cooling fan electrical connector.
  5. Remove cooling fan mounting bolts.
  6. Remove radiator cooling fan assembly from vehicle.

    f9d971c.jpg
    Fig. Removal and installation of the radiator fan-2.7L Engine shown
To install:
  1. Position radiator cooling fan assembly in vehicle.
  2. Install cooling fan mounting bolts. Tighten to 50 inch lbs. (6 Nm)
  3. Connect cooling fan electrical connector.
  4. Install upper radiator hose .
  5. Fill cooling system.
  6. Operate engine until it reaches normal operating temperature.
  7. Check cooling system and automatic transmission for correct fluid levels.

Hope helps (remember comment and rated this).

Jul 13, 2010 | 2001 Dodge Intrepid

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