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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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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1 Answer

On my 2006 ac works good when engine is cool, in stop & go traffic it blows hot air & head pressure gets high in ac, car temp is ok what's wrong


How do you know head pressure is high? Do you have an auxiliary electric cooling fan that is not coming on in this situation? It should be in front of the AC condensing coil. There may be a switch tied to the system that is bad. This switch is sometimes activated by the pressure in the high-pressure line to the condenser coil. If there is not enough freon (134a) the pressure will not be high enough to activate the cooling fan switch. I recently added one can to my system and it made the fan run whereas it did not before adding the freon.

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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,

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1 Answer

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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.

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1 Answer

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2 Answers

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1 Answer

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1 Answer

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1 Answer

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2 Answers

AUXILIARY FAN ALWAYS ACTIVATED


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