What happens when the AC is turned off on a Volvo 850?
If A/C is switched off using the AC OFF switch, ECC control module will cut supply voltage to relay, turning off compressor. However, this does not apply when air distribution control is in defrost setting, since A/C is always on in this case.
How does the heater work on a Volvo 850?
The ventilation damper is operated by damper motor through 2 gear segments; one fitted to damper motor shaft and the other on ventilation damper shaft. Heater (blower motor) fan speed is variably controlled by ECC output (power) stage in response to signals from ECC control module.
When to turn on the ECC in a Volvo 850?
The ECC control module normally supplies voltage to A/C relay, except when heater (blower motor) fan is off and vehicle speed is less than 20 MPH, when heater fan is off and recirculation is on, or momentarily when under full acceleration.
What kind of climate control does a Volvo 850 have?
The temperature control damper motors, recirculation damper motor, floor/defroster damper motor, and ventilation damper motor are all identical, but their control range varies according to the damper being controlled.
What’s the low pressure switch on a Volvo 850?
The high- pressure and safety switch cut power to the A/C compressor if pressure in the A/C high-pressure circuit becomes excessive, supplying a signal to ECM to start cooling fan. The low-pressure switch (pressostat) turns A/C compressor on and off to maintain pressure within limits. floor/defroster damper motor.
Why is my air conditioner not working on my Volvo?
Read below for instructions on recharging your Volvo’s AC. When the AC clutch doesn’t meet the belt correctly you’ll have similar symptoms to low refrigerant charge… warm air, revs dropping every 10 or 20 seconds, etc.. Here’s how to shim the AC clutch on an S60.
How to Shim the AC clutch on a Volvo S60?
Here’s how to shim the AC clutch on an S60. Here’s how to shim the AC clutch on an 850, V70/XC70 up to 2000, S70, or C70. Do not use the high pressure port that is right up front above the radiator. That’s the high side for shops with pro AC refill equipment. Instead, move a couple items out of the way and use the AC low port.
How can I Fix my air conditioner in my Volvo?
If you have a question about your Volvo’s air conditioning, please become an MVS member (free!) and post it to the correct area of the Volvo Forum. If you want to contribute your AC-related fix or experience, please go to the relevant forum and click the NEW TOPIC button and write what you know.
How to Shim the clutch on a Volvo 850?
Here’s how to shim the AC clutch on an 850, V70/XC70 up to 2000, S70, or C70. Do not use the high pressure port that is right up front above the radiator. That’s the high side for shops with pro AC refill equipment. Instead, move a couple items out of the way and use the AC low port.
Is it OK to leave the cooling fan on when the engine is turned off?
Car Fan Still On When Engine is Turned Off You park your car, turn off the ignition and start walking away. Then you notice the engine cooling fan is still running even though the car is turned off. It is ok for the engine cooling fan to keep running for a few minutes after turning off the car.
What are the signs of a bad cooling fan?
Common signs include the engine running hot and cooling fans either not functioning or running all the time. 1. Engine running hot 2. Cooling fans do not function 3. Cooling fans stay on at all times Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool.
When to turn on the cooling fan relay?
The relay will usually be activated once it is detected that the vehicle’s temperature approaches excessively high temperatures. Usually a faulty cooling fan relay will produce a few symptoms that can alert the driver that service may be required.
How does DTC work on a Volvo 850?
If a transaxle problem exists, DTC (s) can be retrieved to determine transaxle problem area. Courtesy of Volvo Cars of North America. Throttle position sensor, mounted on throttle body, determines throttle position and delivers an input signal to TCM. TCM uses input signal for controlling transaxle upshifts and torque converter lock-up.
How to identify a 1995 Volvo 850 transaxle?
For 1995 850, see the AIR BAG RESTRAINT SYSTEM article in the ACCESSORIES/SAFETY EQUIP section. Transaxle can be identified by identification plate attached to top of transaxle case. See Fig. 1.
How big is a Haynes 850 AC compressor?
[ Intermittent AC compressor] Warning: please be very careful. Recharging AC isn’t for the inexperienced. From Haynes 850 manual: Coolant Capacity: turbo: 7.6 quarts non-turbo: 6.4 quarts type: r-134a Refridgerant Capacity: cold climates: 20 ounces hot climates: 26 ounce. 850 High Side AC discharge hose is 1/2 inch in diameter.
What is the instrument panel on a Volvo 850?
1995 Volvo 850 1995-96 ACCESSORIES & EQUIPMENT Volvo Instrument Panels 850 WARNING: When working around steering column and before performing repairs, disconnect and shield battery ground terminal.