Question about 1992 GMC Sierra K1500

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I have a 1991 GMC K3500 with a 7.4 engine. The truck is equiped with a factory auxiliary cooling fan in front of the condensor coil. It will not come on now and the engine temp wants to creap up over 210 when idling with a/c on. I have replaced the thermal switch in the right head as well as the fan motor,radiator,water pump,clutch fan,and a relay on the left fender. I proved out the ground wire on the thermal switch. The relay has a diagram on it but i'm unsure how it works! I don't know if there is another relay of some sort that I haven't located. Can you help? I went to parts store this AM and purchased a "Hayes" repair manuel to get a wiring diagram of the vehicle but an auxiliary fan motor doesn't show up on any of the schematics.!

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6ya6ya
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Posted on Jan 02, 2017

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ourhowse
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Change mass air flow sensor.

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if u taped up the wiring so its weather tight and the abs light reset [went out] then u corrected ur problem and should last

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replace electric part of ignition (everything goes threw it)

Posted on Mar 01, 2011

Ironfist109
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SOURCE: I have a1998 GMC Z71

  • Sounds to me like the Blend Door Actuator might have broke and will not switch to allow the AC flow out into the cabin. What happens is when you switch from AC to Heat there is an arm that moves a door to switch the air inlet. If it broke or stuck in transition the air will not flow freely into the cab. It will still blow some (maybe) and at the set temperature but it will not blow much into the cabin.
  • I will post a pic of yours. It's located above the gas pedal by the blower motor. As you can see at the top of the picture I provided There are two arms. at the end ar some black pieces. Make sure the are did not fall off and make sure there is power to the Actuator connector as well.

ironfist109_134.jpg


  • Hope this helps and thank you for using FixYa.


Regards, Tony

Posted on Jun 13, 2011

  • 79 Answers

SOURCE: My 02 gmc truck will

I would run a cylinder leak tester. It sounds to be a cylinder head gasket leak. I assume there is no oil in the anti freeze, or anti freeze in the oil? They sell these "combustion leak tester" on ebay for around $30. easy to use. If this is not problem then you will almost certainly need a new radiator

Posted on Jul 03, 2011

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When i start my 2008 Cadillac sts i get a notification that engine hot A./C off. Even though it is the first time i stated it today


ENGINE HOT - AC OFF
Cooling System Description and Operation

you must have a cooling system problem of some sort !

Do the cooling fans come on when A/C is switched on ? Fan's should come on ! Does your vehicle have two or three cooling fan's ?
Cooling Fan Control - Two Fan System
The engine cooling fan system consists of 2 puller type electrical cooling fans and 3 fan relays. The relays are arranged in a series parallel (S/P) configuration that allows the engine control module (ECM) to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block. The ground path is provided at G104.
During low speed operation, the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from the low fan fuse through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the cooling fan S/P relay and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. After a 3 second delay, the ECM supplies a ground path for the high speed fan relay and the cooling fan S/P relay through the high speed cooling fan relay control circuit. This energizes the cooling fan S/P relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time, the high speed fan relay coil is energized closing the relay contacts, and provides battery positive voltage from the high fan fuse on the cooling fan motor supply voltage circuit, to the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans running at high speed.
The ECM commands the low speed cooling fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 94.5°C (202°F).
• A/C refrigerant pressure exceeds 1447 kPa (210 psi).
• After the vehicle is shut OFF, if the engine coolant temperature at key-off is greater than 101°C (214°F), the low speed fans will run for a minimum of 60 seconds. After 60 seconds, if the coolant temperature drops below 101°C (214°F), the fans will shut OFF. The fans will automatically shut OFF after 3 minutes, regardless of coolant temperature.
The ECM commands the high speed fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 104.25°C (220°F).
• A/C refrigerant pressure exceeds approximately 1824 kPa (265 psi).
• When certain DTCs set
At idle and very low vehicle speeds the cooling fans are only allowed to increase in speed, if required. This ensures idle stability by preventing the fans from cycling between high and low speed.
Cooling

Having a qualified professional technician check it out would be your best bet ! Hooking up a factory or professional type scanner an check data input's an DTC'S - diagnostic trouble codes .

Diagnostic Starting Point - Engine Cooling
Begin the system diagnosis with the diagnostic system check. Refer to Diagnostic System Check - Vehicle . The Diagnostic System Check - Vehicle will provide the following information:
• The identification of the control modules which command the system
• The ability of the control modules to communicate through the serial data circuits
• The identification of any stored DTCs and their status
The use of the Diagnostic System Check - Vehicle will identify the correct procedure for diagnosing the system and where the procedure is located.

DTC P0480: Cooling Fan Relay 1 Control Circuit
DTC P0481: Cooling Fan Relay 2 Control Circuit
DTC P0480: Cooling Fan Relay 1 Control Circuit
DTC P0481: Cooling Fan Relay 2 Control Circuit
DTC P0691: Cooling Fan Relay 1 Control Circuit Low Voltage
DTC P0692: Cooling Fan Relay 1 Control Circuit High Voltage
DTC P0693: Cooling Fan Relay 2 Control Circuit Low Voltage
DTC P0694: Cooling Fan Relay 2 Control Circuit High Voltage
DTC P1258: Engine Coolant Overtemperature - Protection Mode Active
DTC P2600: Auxiliary Coolant Pump Relay Control Circuit
DTC P2601: Auxiliary Coolant Pump Performance
DTC P2602: Auxiliary Coolant Pump Relay Control Circuit Low Voltage
DTC P2603: Auxiliary Coolant Pump Relay Control Circuit High Voltage

Dec 10, 2017 | Cadillac Cars & Trucks

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

99 tiburon over heating


condensor sit in front of radiator if condensor damaged to badly it will block air flow through cooling fins which will block off air from radiator cooling fins when vechicle moving it will overheat if condensor or radiator damaged.your cooling fan need to be working because it will turn on when engine get to certain temperature if not engine will over heat.

Feb 12, 2012 | Cars & Trucks

1 Answer

Need to know where is the location of switch to turn on the radiator fan


1995 Isuzu Rodeo is equipped with a belt driven fan with a viscous fan clutch for engine cooling. The electric fan is for A/C condensor cooling only. The condensor fan is switched on and off by the A/C fan relay, which is operated by the triple pressure switch located in the A/C line on the left side of the engine compartment.


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DO NOT
attempt to replace the triple pressure switch without first using the proper equipment to evacuate and recover the freon in the A/C system. The A/C system is under high pressure and attempts to replace parts without discharging the system can result in serious injury.

Dec 04, 2011 | 1995 Isuzu Rodeo

1 Answer

My 91 Chevy pickup overheats when the AC is running. It normally runs 150 degree, but when the AC runs, it climbs to 220-240. All fluids and belts are OK. Thermostat is OK


is there a grill insert if so remove
is condensor clean (front a/c rad) clean with garden hose pressure
are fins of condensor folded over (they can be comb back to shape)
is engine cooling fan working when engine hot rev engine and look at fan
to see if fan responds to engine rpm properly
if fans electric check to see if power is there when a/c is switch on
should go on immidiatley with a/c switch on

Jul 20, 2011 | 1991 Chevrolet K1500

2 Answers

2004 audi a4 temperature is going on high when driving and then temperature goes to normal when i stop


SOUND LIKE FAULTY CLUTCH FAN OR THE AUXILIARY ELECTRIC COOLANT FAN NOT RUNNING. CHECK AUXILIARY FAN FUSE AND RELAY. IF LOOK GOOD HOT WIRE TO SEE IF FAN TURNS ON IF NOT FAN FAULTY. IF FAN RUNS YOU HAVE FAULTY THERMO SWITCH. WHICH LOCATED AT THE BOTTOM OF RADIATOR ON THE LEFT HAND SIDE OR ON THE LOWER RADIATOR HOSE ON THE RIGHT HAND SIDE OF THE ENGINE COMPARTMENT.IF FANS OKAY COOLANT LEVEL CORRECT.REPLACE THERMOSTAT.HAVE RADIATOR AND ENGINE FLUSHED.CHECK IN FRONT OF GRILLE MAKE SURE NO DEBRIS BLOCKING OFF AIR FLOW THROUGH RADIATOR CORES AND AC CONDENSOR CORES.

Dec 26, 2010 | 2004 Audi A4

1 Answer

Auxiliary fan of my kia rio 2003 does not work. brought it in a shop and they took the fan and tested it it works. when i checked it it again the other day it stop working.what's wrong?


there are 2 fans. one in front and one behind radiator.the front one is for a/c equipped cars only and only runs when a/c or defroster is on. the engine cooling fan comes on only when temp reaches around 210 degrees faren.you didnt say anything about overheating so i assume you may not understand how they work

Jun 20, 2010 | 2001 Kia Rio

1 Answer

My Jimmy 1995 Overheat whith A/C On


Is it idicating an actual overheat or is it just running warmer than usual? Do you have a guage or a light? Most vehicles WILLrun hotter with the AC on because the AC condensor is directly infront of the radiator. Some have an auxiliary fan for this. If you do make sure it is running. Start and get the engine up to running temp. With the hood open peek in to see if you have one or two cooling fans. Watch with the AC on that Both are running in cycles.

Jul 24, 2009 | 1995 GMC Jimmy

1 Answer

GMC Sierra A/C Stops Cooling After Driving a Few Minutes


It sounds like you either have an condensor fan problem or low freon. The condensor fan is near the radiator. In some cases the radiator fan doubles as the condensor fan. So look there too.

May 09, 2009 | 1991 GMC Sierra

2 Answers

AUXILIARY FAN ALWAYS ACTIVATED


if you have your a/c or defrost on the fan will come on as the a/c cuts it on to cool condensor.
if they are not on then you have a relay sticking or someone has rewired the fan

Sep 29, 2008 | 2000 Honda Civic

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