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Ac condenser fan

azlincoln79 on Sun June 22, 2008 9:09 PM User is offline

Year: 1995
Make: GMC
Model: K2500
Engine Size: 454
Refrigerant Type: 134
Ambient Temp: 110
Pressure Low: 50
Pressure High: 340
Country of Origin: United States

Just replaced the compressor, drier, o tube.hose and fan clutch. Vent temps were at 75. Sprayed water on the condenser and the high side went down to 150. I noticed this truck had a electric condenser fan that was not working. I am trying to find a part number on that. I am also thinking there is a cabin filter on this truck. Rock auto parts list one. Does any one know where it is? I am also thinking the evaporator on this truck may be as dirty as the one on the other truck in another post.

GM Tech on Sun June 22, 2008 10:30 PM User is offline

That auxillary condenser fan is only found on 454 engine applications-- it is activated by a high pressure switch on the condenser inlet (I believe) that switch on around 275 psi or so-- maybe less- I forget- but if you jump that switch the fan shoould engage-- or put 12v staright to fan and see if it runs-- be sure you have condenser plumbed correctly- GM C/K trucks CAN be plumbed backwards!!! They have the same connection on both ends of condenser!! The hose from compressor MUST go to top of condenser....this would yield poor cooling and high pressure like you describe if plumbed backwards-- have seen several body shops screw this up.......

I drive the same truck a 3500 crew cab dually--- have never seen a cabin filter for them

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Edited: Mon June 23, 2008 at 8:55 AM by GM Tech

azlincoln79 on Sun June 22, 2008 10:38 PM User is offline

I hooked up 12 volt power to the fan and it did not come on. I will check and see if the hoses are on right

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