SOURCE: diagnostic codes on '94 caddy deville
powertrain control module, controls engine and trans, by getting signals from info.sensors,
SOURCE: 1999 Caddy Deville A/C problem
A/C systems are hard to diagnose without having access to the vehicle. One of the most common problems is undercharge (Not enough freon in the system) indicating a leak somewhere in the system. Other causes could be a burnt A/C compressor clutch fuse, defective compressor clutch, defective compressor/belt, defective High/Low pressure switches in the system, defective evaporator icing switch, defective wiring... Basically, you're better off getting the system diagnosed by a good A/C knowledgeable mechanic...
SOURCE: heater on ford 2003 ford pick up blows cold air
on the evap box there is a control mtr that switches the hot cold door. these mtrs are prone to failure. the other problem that i have seen is that the door breakes in side the evap box and that means removing the box to replace the door . if i remeber correctly you may have to slide the dash back to gain assces to the control mtr to test it good luck
SOURCE: My 91 cadillac devile has no heat , just cool air blows even when
The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.
if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.
SOURCE: 91 chevy 4.3 v-6 runs extremely rich when engine
DTC - 13
Oxygen sensor circuit open or no activity
DTC - 33
MAP sensor circuit error (signal high indicating low vacuum)
DTC - 54
Fuel pump circuit low voltage
Start with checking the wire leads to the O2 sensors and MAP sensor. Look for any damages to the wire harness and replace any parts damaged or faulty.
The O2 and MAP sensor take reading and sends it to the ECM to recalibrate the fuel injector pulse to adjust the amount of fuel entering the cylinders. When there is an issue to the O2 sensor or MAP sensor and even both, the ECM will be set a a factory default to run rich to keep the engine running and at times the engine may not even run. Normal fuel to air ratio is 14.7:1 - 14.7 air to 1 parts fuel and at default it could be as high as 12.5:1. Good luck and keep me posted, be glad to help you get your truck running 100% again soon and please rate. replacing the thermostat and temperature sensor would also be a good thing since the 4.3 runs best at 190".
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