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97 hardbody air conditioner blows cold then warm air Forums > > 97 hardbody air conditioner blows cold then warm air 97 hardbody air conditioner blows cold then warm air
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Frontier Nissan Frontier/HB/Truck Discussion Forum

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  #1  
Old 05-23-2019, 01:46 PM
1997pickup 1997pickup is offline
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Default 97 hardbody air conditioner blows cold then warm air

97 hardbody air conditioner blows cold then warm air or takes several minutes to cycle cold air after starting - 4 cyl 2wd
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  #2  
Old 05-28-2019, 05:10 AM
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Check fan clutch. Clean off AC condenser. Make sure all fan/radiator shrouds are in place.

Have a shop check for leaks and recover/weigh the R134a amount, only real way to determine if there has been a leak.
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Old 05-29-2019, 01:19 PM
1997pickup 1997pickup is offline
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thanks for the info - will have it checked - ALSO I have noticed it blowing warm then getting cold (after several minutes) and sometimes it doesn't seem to kick on (a/c)
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Old 05-29-2019, 04:33 PM
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Quote:
Originally Posted by 1997pickup View Post
thanks for the info - will have it checked - ALSO I have noticed it blowing warm then getting cold (after several minutes) and sometimes it doesn't seem to kick on (a/c)
When the cooling is less (I assume that the air volume out the vents is unchanged), pull over, leave engine and AC on, and visually check to see if the AC compressor is engaged or if the AC clutch outer pulley is just spinning freely and the center not turning.
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  #5  
Old 08-03-2019, 11:12 AM
1997pickup 1997pickup is offline
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is there a thermal resistor that regulates or reads temp and opens the circuit to cycle on AC - I know there is one in the altima (early models) that causes problems - thanks for your input
also replaced blue relay under hood
was told you could remove blue relay and bridge to contacts with a paper clip to keep AC on

Last edited by 1997pickup; 08-03-2019 at 11:16 AM.
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  #6  
Old 08-04-2019, 11:14 PM
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Yes, there is a "thermistor"...also, sometimes referred to as a "thermal amp"...on the evaporator core. It's job is to detect the core temperature to prevent it from freezing. If the thermistor gets too cold, it open the power circuit to the A/C compressor clutch. I would use a gauge set to see what the high and low system pressures are before replacing the thermistor. It could be just you are a low on refrigerant (which could indicate a slow leak in the system, as well).
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Old 08-06-2019, 01:48 PM
1997pickup 1997pickup is offline
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Thanks for the response
I was told that all hoses were checked and pressures were normal for the system - no leaks found (I will have them checked again by someone else) - when ac is working it is very cold air ( I don't think there is a change in the cold air temp from 2 weeks ago - it is still very cold air) - thanks everyone for your input
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Old 08-06-2019, 10:05 PM
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Check the compressor clutch air gap with a feeler gauge and compare to the FSM specs.
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  #9  
Old 08-07-2019, 07:11 AM
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Quote:
Originally Posted by Cusser View Post
When the cooling is less (I assume that the air volume out the vents is unchanged), pull over, leave engine and AC on, and visually check to see if the AC compressor is engaged or if the AC clutch outer pulley is just spinning freely and the center not turning.
I just removed an AC clutch shim on my 1998 Frontier to adjust the AC clutch gap, about 6 weeks ago. And it has worked perfectly (Arizona) since then. On mine, I used three 5mm bolts to pull the clutch drive plate off, did all this with compressor and belt installed. See Post #126 here 1998 Nissan Frontier - Page 7
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