Question about 1999 Plymouth Voyager

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Compressor is working, high pressure side is hot and the rest is normal (average air temp.) temperature

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You have a bad a/c compressor the pressure side is getting hot cause its not flowing as the low is normal temp cause its not cooling

Posted on Jun 27, 2009

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2007 ford KA blowing hot air


see this causes and fix it. God bless you
Compressor Checks
checkmark.gif Start with the compressor. Does it engage when you turn on the A/C?
If so, the compressor is working and the A/C system probably contains enough refrigerant to make cold air, so the problem is inside the HVAC unit. Replace the motor that controls the blend air door (this is a difficult job and best left to a professional since it involves tearing apart the HVAC unit -- about an 8 to 10 hour job!).
If the compressor does not engage when you turn on the A/C, see if it will run by jumping the compressor clutch wire directly to the battery (use a fused jumper wire). If the compressor works when you jump it, and the A/C blows cold air, the system contains refrigerant and the fault is likely a bad A/C compressor clutch relay or a bad clutch cycling switch or pressure switch.
If the compressor does not engage when you jump it, the problem is a bad compressor clutch.
If the clutch engages but the compressor does not turn (the belt will start to slip and squeal), the compressor is locked up and you need a new compressor.
If the compressor clutch engages and turns the compressor, but the A/C still does not blow cold air, the system is probably low on refrigerant and needs to be recharged.
Refrigerant Checks
checkmark.gif Connect an A/C pressure gauge to the HIGH SIDE service port (located in the high pressure hose that runs between the compressor and the condenser in the front of the engine compartment). The gauge will tell you if there is any pressure in the system. Simply depressing the service fitting valve with a small screwdriver to see if any refrigerant squirts out is NOT an accurate check because it tell you how much pressure is in the system. It may still have some pressure but not enough to trip the low pressure safety switch so the compressor will engage.
If your A/C system is low or out of refrigerant, check for leaks, then have the A/C system vacuum purged to remove air. After the air is out, it can be recharged with the specified amount of refrigerant. It is important to get any air out as this will reduce cooling efficiency and may make the compressor noisy.
A/C System Functional Checks
checkmark.gif If the refrigeration circuit seems to be working (refrigerant in the system, compressor running and building pressure), but there is still no cooling, the problem might be an obstruction in the orifice tube (located in the high pressure hose between the condenser in the front of the radiator, and the evaporator located in the passenger compartment). A blockage here will prevent the refrigerant from entering the evaporator or recirculating through the refrigeration circuit.
If the orifice tube is plugged, the high side pressure reading will be lower than normal, and the low side reading will also be lower than normal because no refrigerant is circulating through the system.
checkmark.gif If the refrigeration circuit seems to be functioning normally (compressor running, frost or condensation on the high pressure line from the condenser to the evaporator), but no cool air is blowing out of the ducts inside the car (and the blower is working), the fault is likely a BLEND AIR door that is stuck in the HEAT position, or possibly a badly clogged cabin air filter that is restricting airflow. Another possibility would be a fault in the automatic climate control system such as a ad interior temperature sensor or control module.

Sep 28, 2012 | 2007 Ford Ka 1.3

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Detroit Diesel Fault Codes


Code Description DDEC V Circuit
11 P 187 4 Chain PTO. Short circuit in the power
11 P 187 7 control system PTO wrong answers
12 P 187 3 Chain PTO. Short circuit in the ground
13 P 111 4-level circuit antifreeze. Short circuit in the ground
13 P 111 6 second-level circuit antifreeze. Short circuit in the ground
14 P 52 3 circuit coolant temperature intercooler. Short circuit in the power
14 P 110 3 circuit temperature antifreeze. Short circuit in the power
14 P 175 3 Chain oil temperature. Short circuit in the power
15 P 52 4 circuit coolant temperature intercooler. Short circuit in the ground
15 P 110 4 circuit temperature antifreeze. Short circuit in the ground
15 P 175 4 Chain oil temperature. Short circuit in the ground
16 P 111 3-level circuit antifreeze. Short circuit in the power
16 P 111 5 second circuit level antifreeze. Short circuit in the power
17 P 51 3 Throttle position circuit failed high
17 P 72 3 Bypass position circuit failed high
17 P 3 354 Relative humidity sensor circuit failed high
18 P 51 4 Throttle position circuit failed low
18 P 72 4 Bypass position circuit failed low
18 P 354 4 Relative humidity sensor circuit failed low
21 P 91 3 TPS circuit failed high
22 P 91 4 TPS circuit failed low
23 s 65 3 Oxygen content circuit failed high
23 P 174 3 Chain fuel temperature. Short circuit in the power
24 s 65 4 Oxygen content circuit failed low
24 p 174 4 Chain fuel temperature. Short circuit in the ground
25 no codes
26 s 25 November Aux. shutdown # 1 active
26 S 61 11 Aux. shutdown # 2 active (Incorrect SID. subject to change)
27, p 105 3 circuit temperature in the reservoir. Short circuit in the power
27 p 171 3 Ambient air temp circuit failed high
27 p 172 3 Air temp, circuit failed high
28, p 105 to 4 Chain manifold temperature. Short circuit in the ground
28 p 171 4 Ambient air temp circuit failed low
28 p 172 4 Air temp, circuit failed low
29 p 404 4 TCO temperature circuit failed low
29 p 351 4 TCI Temperature circuit failed low
31 S 51 3 Aux. Output # 3 open circuit (high side) S3
31 S 51 4 Aux. Output # 3 short to ground (high side) S3
31 S 51 7 Aux. Output # 3 mech. system fail S3
31 s 52 3 Aux. Output # 4 open circuit (high side) T3
31 s 52 4 Aux. Output # 4 short to ground (high side) T3
31 s 52 7 Aux. Output # 4 mech. system fail T3
32 S 238 3 SEL short to battery B1
32 S 238 4 SEL open circuit B1
32 s 239 3 CEL short to battery B2
32 s 239 4 CEL open circuit B2
33 p 102 3 Boost pressure circuit failed high
34 p 102 4 Boost pressure circuit failed low
35 p 19 March Ext range oil pressure circuit failed high
35 p 100 3 Chain oil pressure. Short circuit in the power
36 P 19 April Ext range oil pressure circuit failed low
36 P 100 4 Chain oil pressure. Short circuit in the ground
37 P 18 March Ext range fuel pressure circuit failed high
37 P 94 3 Chain fuel pressure. Short circuit in the power
37 P 95 3 Fuel Filter Restriction circuit failed high
38 P 18 April Ext range fuel pressure circuit failed low
38 P 94 4 Chain fuel pressure. Short circuit in the ground
38 P 95 4 Fuel Filter Restriction circuit failed low
39 S 146 2 Mechanical error EGR valve
39 S 146 12 Mechanical error EGR valve
39 S 146 return valve 7 does not meet the exhaust
39 S 147 2 turbocharger control mechanism does not respond
39 s 147 12 turbocharger control mechanism does not respond
39 s 14 147 current returns exhaust gases enough
39 S 147 11 turbocharger control mechanism does not respond
39 S 147 7 turbocharger control mechanism does not respond
41 S 21 0 Too many SRS (missing TRS)
42 S 21 January Too few SRS (missing SRS)
43 p 111 1 Low coolant level
44 p 52 0 ntercooler coolant temp, high
44 p 105 0 temperature in the reservoir above the norm
44 p 110 0 antifreeze temperature above normal
44 p 172 0 Air inlet temp, high
44 p 175 0 Oil temperature above normal
45 p 19 January Ext range oil pressure low
45 p 100 1 Oil pressure below normal
46 p 168 1 Low voltage batteries
46 S 214 1 RTC Backup Battery Voltage Low
46 S 232 1 Sensor Supply Voltage Low A3 & W1
P 0 47 18 Ext range fuel pressure high
P 47 94 0 The fuel pressure above normal
47 p 0 102 Turbo boost press high
47 p 106 0 Air inlet pressure high or TCBV diff press high
47 p 164 0 Injection control pressure high
48 p 18 January Ext range fuel pressure low
48 p 94 1 fuel pressure below normal
48 p 106 1 Air inlet pressure low
48 p 164 1 Injection control pressure low
48 p 351 1 TCI Temperature below range
48 p 404 1 TCO Temperature below range
48 p 411 1 EGR Delta pressure low
48 p 412 1 EGR Temperature low
49 p 351 0 TCI Temperature above range
49 p 404 0 TCO Temperature above range

More Fault Codes here Detroit Disel DTC

on Dec 20, 2016 | Cars & Trucks

2 Answers

A dealership fixed my cooling system. I was told it was an airpocket in the system. Now my ac only blows hot air. They keep putting me on hold and its hot outside. any ideas?


if the low side tube is cold while the compressor is working the problem will be on air door module, or one piece of hose from intake manifold go to recirculation door is dis connected, but if he compressor is not working, there is only two reason, even the refrigerant pressure is too high or too low, if low a leak on your system, if too high overcharge or clogged expansion valve or the condenser, if refrigrant is i the right pressure and compressor is not working, check the supply on main switch, ambient temperature sensor, refrigrant pressure sensor and the high pressure sensor, if all ok,. replace compressor

Aug 05, 2010 | 1989 Ford Crown Victoria

2 Answers

How many pounds of r134 and how much oil ozs.


somewhere around 1.6 pounds (1lb.14ounces) of R134a if system is evacuated and 3 ounces of oil with new compressor.
keep pressure on the low side around 34-37psi & it should blow snow. Below are normal car AC pressure readings with 134A.
  • Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI
  • Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI –
  • Normal high side reading ranges from 200-350 PSI
Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor.
DIY recharge kit:
With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold – STOP don’t overcharge the system.
Thank you for using fixya and be safe.

Jul 19, 2010 | 1994 Chevrolet S-10 Blazer

1 Answer

A/c recharge what is thew psi for refrigerant


Below are normal car AC pressure readings with 134A.

Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI

Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI

Normal high side reading ranges from 200-350 PSI
Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor.

With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience.

If normal gauge readings are obtained and the vent air is cold – STOP don’t overcharge the system. The only proper way to remove refrigerant is with a AC recovery machine so if this is being done at home I can’t emphasize enough not to over charge the system.

Thank you for using fixya and be safe.

Jun 17, 2010 | 2002 Ford Expedition

3 Answers

I have a 1994 chevy c1500 with a 305 motor. when i turn on the A/C the clutch engages/disengages continuously but no cold air. Any ideas?


Your A/C system may be running low on R134a.
To diagnose problems, an A/C manifold gauge set is needed to read high and low side pressure readings. Avoid adding refrigerant with a simple charging kit like the ones sold at parts stores. Don’t add any stop leak, this can cause problems in the compressor, expansion valve or condenser.
First, on a 134A system the high and low side service ports are different sizes. AC gauge sets have color coded hoses, the blue color coded hose has a connection that fits on the low side service port and the red hose has a connection that will only fit onto the high side. The yellow hose won’t hook up to anything if just checking the readings; it can be used to connect to a vacuum pump or attached to a refrigerant can or tank.
Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI
Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI – Note that on many Chrysler products a normal reading on the low side may be 15-25 PSI
Normal high side reading ranges from 200-350 PSI
Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor.
With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold – STOP don’t overcharge the system. The only proper way to remove refrigerant is with a AC recovery machine so if this is being done at home I can’t emphasize enough not to over charge the system. And actually the best way to insure the proper charge is in a system, is to use an AC machine to recover the freon and then evacuate and recharge the system with the correct amount. Most cars have the specified amount on a decal under the hood.
Both low and high side readings are lower than normal, this indicates a cars AC system is low on refrigerant and is under-charged.
If both low and high side readings are too high, this indicates an overcharged system – too much refrigerant. This also can indicate that the condenser fan is not working, is too slow or the car is overheating and heat is transferring from the radiator to the condenser.
When the low side goes so low that it’s reading shows it is in a vacuum, the most likely cause is a bad expansion valve or blocked orifice tube. Another possibility is a restricted condenser. Blocked condensers are not as common as they used to be but if a compressor fails and comes apart inside the remnants can end up in the condenser causing it to restrict the flow of refrigerant.
When the compressor clutch is definitely engaged and the low side is high and the high side is low, the most likely cause is that the compressor is failing – it is not pumping sufficiently. Rarely an AC clutch could be slipping but usually this will be accompanied with a squeal or chirp. Also be sure not to overlook the obvious, like a loose belt
Note: The line going from the compressor to the condenser is the discharge line – it is normal for it to be very hot to the touch. The other line going from the drier or accumulator to the compressor is normally colder. The liquid line can be hot up to the point an orifice tube is in place. Just remember that LOW Pressure = COLD and HIGH Pressure = HOT.
If you do want to recharge the system your self, make sure you do not over charge and use the thermometer at the vent and when it's cold enough, turn off the valve from the recharge line and disconnect from the low pressure service port. Good luck

Nov 04, 2009 | 1994 Chevrolet C1500

2 Answers

Air conditioner in 1999 mercury tracer won't work. It's not the compressor nor does it have a leak. what could be the problem?


the tracer is the same as the ESCORT, right?? TRY THIS--I WORK ON PLENTY OF ESCORTS--LOOK UNDER THE AIR CLEANER/CONE ASSEMBLY--THERE WILL BE A BLACK METAL BOX(FULL OF RELAYS) ONE OF WHICH IS THE A/C RELAY--TRY TAPPING ON IT WITH A LONG SCREWDRIVER OR SOMETHING SIMILAR WHILE U HAVE THE A/C ON. IF THE A/C SUDDENLY STARTS WORKING U NEED TO GET A NEW RELAY BOX(I THINK ITS CALLED A GEM MODULE) i do have a question- does the blower motor work?? how do u know the compressor is good??do you have 12 volts going to it??? this relay box is pretty common to go bad--u have to remove the air cleaner in order to get to it.get back to me.

Sep 07, 2009 | 1999 Mercury Tracer

2 Answers

AC not cooling


You need to have the system vacuum evacuated, using a vacuum pump and a set of gauges, to verify that it is holding. You also must install EXACTLY the amount or refrigerant that the system calls for. Too much or too little will result in failure.

Sep 03, 2009 | 1995 Geo Prizm

1 Answer

Compressor will not turn off but cannot find the location of the low pressure switch to change it. blows cold but will not cycle off...


there is a thermistor switch located in evaporator case(thin black single or 2 wires) that makes the compressor cut in and out (cycle) it monitors evaporator temperature.
check head pressures with air cond charging station or gauge set and monitor pressure on high and low side (150-200kpa on low, 1500-1800kpa on high good average depending on ambient temp) if it is low on gas due to leak this can also keep compressor running longer due to evaporator temp not reaching lowest threshhold to cut compressor out

Jun 13, 2009 | 1998 Chevrolet S-10 Pickup

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