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FUEL PUMP RELAY
1987 Nissan/Datsun Truck D21 Truck 2WD 2.4L FI 4cyl
The Fuel Pump Relay is located:
Under hood, passenger side, front engine area, rear of headlight housing, mounted on upper fenderwell
hello,better to check your evaporator sensor (resistance) also your pressure sensor in dryer tank for proper function,,you can try to cover the small vent to check the small motor is working for your in car sensor,or you can test,by put your cigarette lighter near your vent,should be your blower motor speed increase,ty
This is a control problem usually with a vacumn air supply system.
Check under the hood for any small cracked hoses and loose fitting
hoses on thier connectors. The other control hoses are behind the
dashboard and not easily accessable. You go into the dash or find
someone who can.