If you mean that the blower stops blowing for a while and then starts blowing again, you might want to replace the blower resistors. Sometimes they break and will make a connection then break the connection as they cool and heat up.
Have you noticed that the AC quits blowing cold air when you are heavy on the throttle, or climbing a hill? Does it return to blowing cold air when you let back off the throttle and relieve the load from the engine?
If you answered YES to those questions, your AC is operating normally. AC compressors take quite a bit of power from the engine to operate. In vehicles with smaller engines, the AC compressor will disengage when there is a heavy demand for power placed on the engine, and you will not get cold air. When that demand is gone, it re-engages power to the AC compressor.
SOURCE: My AC suddenly stop working,
Your A/C system may
have lost its charge of refrigerant, or the compressor may not be
engaging when you turn on the A/C, or the blend air door inside the HVAC
unit may be stuck in the HEAT position so no air goes through the A/C
evaporator.
Start with the compressor. Does it
engage when you turn on the A/C?
If so, the compressor is working and the
A/C system probably contains enough refrigerant to make cold air, so the
problem is inside the HVAC unit. Replace the motor that controls the
blend air door (this is a difficult job and best left to a professional
since it involves tearing apart the HVAC unit -- about an 8 to 10 hour
job!).
If the compressor does not engage when
you turn on the A/C, see if it will run by jumping the compressor clutch
wire directly to the battery (use a fused jumper wire). If the
compressor works when you jump it, and the A/C blows cold air, the
system contains refrigerant and the fault is likely a bad A/C compressor
clutch relay or a bad clutch cycling switch or pressure switch
.
If the compressor does not engage when
you jump it, the problem is a bad compressor clutch.
If the clutch engages but the compressor
does not turn (the belt will start to slip and squeal), the compressor
is loced up and you need a new compressor.
If the compressor clutch engages and
turns the compressor, but the A/C still does not blow cold air, the
system is probably low on refrigerant and needs to be recharged. If you
Have an A/C gauge set, hook it up and see if the system has any
pressure.
If it is out of refrigerant or is low,
check for leaks, then have the A/C system vacuum purged to remove air.
After the air is out, it can be recharged with the specified amount of
refrigerant. It is important to get any air out as this will reduce
cooling efficiency and may make the compressor noisy.
My advice to you if you know nothing
about A/C service is to find a repair shop that specializes in A/C
repairs and let them fix your cooling problem for you. Today's A/C
systems with automatic climate control are very complex and reuire
special tools and know-how to diagnose and repair.
SOURCE: AC not blowing cold air at times
poss causes are, sticking low pressure switch, defective Ac compressor clutch closing coil or incorrect clutch driven plate air gap, spec is 0.26 thousands.
SOURCE: our focus has stopped blowing air. Neither the
Quick and easy - Check for blown fuse. All problems you mentioned are linked to same fuse.
SOURCE: 2001 Chevy Tahoe AC stopped working
There is a possibility that the A/C compressor clutch burned up or got disconnected. Try investigating the wiring for the clutch.
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