My AC on my 95 cadillac seville sls only blows on low, I have climate control what could be wrong?

Question

The ac blower started to be intermittent... now only blows on low. The fans and clutch are activated.

Answer 1

Sounds like a bad fan switch to me. If it was your blower motor, it wouldn't work on any setting.

Answer 2

Welcome! do you have the 4.6 or 4.9 Liter engine?

And is the check engine light on. Sometimes there is a DTC set for this condition.(DTC) is Diagnostic Trouble Code. I have the blower speed diagnostic chart to help you diagnose the improper fan speed situation. I can not send through Yahoo. See me at AutoHelpRepair.Com.

See the (ACP) Air conditioning Programmer is responsible for this condition and we need to check this out. You will need to have a volt and ohm meter before we can begin. I wish there was a way to send you an attachment.



CIRCUIT DESCRIPTION

The air flow is controlled by modulating the commanded blower

voltage which varies the blower speed- The blower is a function

of the program number when it is under automatic control with

adjustments being made based on vehicle speed, coolant

temperature, and solar load. There are special cases which may

override the normal operation of the blower such as to limit

snow ingestion, purge air ducts, cool the instrument panel

cluster, or enhance heater warm-up performance.

TEST DESCRIPTION

Using on-board diagnostics allows us to override the climate

control panel request. If the blower is inoperative in normal

operating procedures, but operates properly in override, the

Instrument Panel Cluster (LPC) or data line between the WC and

Air Conditioning Programmer (ACP) Air Conditioning

Programmer (ACP) would be suspect.

1. This branch looks at the blower control output to

determine if the ACP is sending voltage to the blower or if

problem could be in the circuitry.

2. This branch looks at the programmer to determine if output

is correct and looks at the input to the blower motor to

check for opens in the circuit. If input and output are

similar, it indicates a problem with the speed control within

the blower assembly.

3. Since the automatic control operation of the blower

undergoes adjustments based on vehicle speed, coolant

temperature, and solar load, a properly operating blower

may be controlling improperly. chart 4 includes sensor

tests which may identify a problem with the sensor inputs.

4. This vehicle uses an WC cooling mode to protect the WC

electronics from overheating under high in-car temperature

conditions. if the temperature inside the vehicle exceeds

l25F even if off has been selected, the blower will be

enabled and will run until in-car temperature drops below

l21 degree F.

NOTES ON INTERMITTENT CONNECTION

if an intermittent DTC is being set, select Air Conditioning

Programmer (ACP) Snapshot Data for DTC and note value of

AC? data parameter. Manipulate the related wiring while

observing AC? data parameter. If a failure is induced, the

displayed data parameter value will be outside the sensors

normal operating range.



Regards, Master Tech Lee

www.autohelprepair.com

Answer 3

May be a bad variable resistor for the blower motor

Answer 4

Sorry BRENT!!!! it is new college HVAC platforms, they not use vacuum operated actuators. Its all electric powered!!!! want to work out which code is saved interior the HVAC module, likely the mode door actuator is undesirable. common problem on those. by the way, make positive you get someone who's frequent with what they're doing. Your assume to get rid of the sprint to change that mode door actuator. there's a cheat to change the module without doing all that nonsense besides the undeniable fact that the guy needs to understand what they're doing though Forgot to point, you ought to listen a clicking noise once you attempt to change different positions. in case you listen the clicking noise, it is the actuator