Re: Blower motor update (archive)

WELL THIS IS MY WEEK FOR A/C TROUBLESHOOTING. HERE'S WHAT I CAME UP WITH. IF HEATER BLOWER MOTOR (SEPARATE ITEM) HAS PROPER SPEED CONTROL FORM THE INSIDE DASH CONTROL. THEN SPEED CONTRO SWITCH IS OK AND RESISTOR PACK INSIDE OF A/C AIR BOX IS OK.

YOU PRESS SWITCH FOR A/C, RELAY TRIPS (FLIPS CIRCUIT TO ENERGIZE A/C FAN CIRCUIT, ENERGIZES TEMP CONTROL TO ENGAGE AND DISENGAGE A/C COMPRESSOR CLUTCH, ENERGIZES A/C EVAPORATIVE TEMP SENSOR (WHICH SAYS HOW MUCH COOL BEFORE I TRIP OUT THE A/C COMPRESS CLUTCH).

YOU COULD HAVE SOME TRICKLE VOLTAGE GETTIN TO THE A/C BLOWER CONNECTOR (AND AT 12V). THE TRICK HERE IS CURRENT (WAY MORE AT SPEED 3 THAN AT SPEED1). GOT TO TEST FOR CURRENT (CAREFUL HERE I DON'T KNOW HOW MUCH).

SUMMARY: I BROKE MY A/C EVAPORATIVE TEMP SENSOR ON THE WAY TO REASSEMBLY (REPLACING A/C BLOWER). GUESS WHAT? NO BLOWER SPEED, NO A/C CLUTCH TRIP, AND DEFINETLY NO COOL AIR. FIND THIS SENSOR AND GENTLY DISCONNECT IT AT THE CONNECTOR, INSERT A JUMPER IN THE WIRED END OF THE CONNECTOR, THEN PRESS BUTTON FOR A/C. MAKE SURE TEMP CONTROL IS WAY DOWN TO COOL SIDE (CAN BE DONE WITH IGNITION SWITCH ON). KEEP THE TEST TIME DOWN IN THIS MODE (ENGINE NOT RUNNING: IDLE CONTROL VALVE IS RUNNING).

MIGHT TO POP OUT RADIO AND LOOK UNDER INSULATION FOR THE A/C TEMP SENSOR!!

IF NONE OF THIS OR SOME OF THIS DOESN'T MAKE SENSE "E-MAIL" AND I'LL STRETCH IT OUT FOR YAH. GOOD LUCK!!!!!!

BILLA
Hello all here is a up date please help i'm getting voltage to the plug for the ac blower motor but when i turn on motor i get nothing. i hooked 12 volts directly to the motor and the motor spins what else should i look for? Thanks in advance ~JOHN BANNER~ in florida where its hot and ac is broke :(

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