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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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. |
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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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 |
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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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 |
Check the compressor clutch air gap with a feeler gauge and compare to the FSM specs.
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Check the compressor clutch air gap with a feeler gauge and compare to the FSM specs.
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