Question about 2000 Cadillac DeVille

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The low speed engine coolant fan does not come on when I start the car and turn on the AC. I blew a condenser and have replaced it but the freon pressure get over 300lbs on the hight side. The low speed fan is intermittant so I was able to recharge the AC systyem after replacing the condenser during a time when they were running. I have cheched the relays, they are good. the fuses are good, I applied 12VDC to the fans at the rely plug and both fans are good. I also turned off the AC and ran the engine until the temp reach 221 degree f. the low speed fan came on but shut off as soon as I turned on the AC. There are no OBD codes.

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  • Cadillac Master
  • 3,828 Answers

Any low fan relay or just fan comes on when the aircon switch is on

Posted on Apr 10, 2017

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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dennymulford
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SOURCE: 88 Cadillac Deville cooling fan runs continuously

you have a bad fan swtich in the block or the therostat housing its an easy fix

Posted on Jan 26, 2009

  • 6982 Answers

SOURCE: overheats on hwy. Radiator fan does not engage after overheating

fan does not generally come on till you reach about 210f. second fay comes on when ac compressor is on. Allowing for gauge inaccuracy this does not sound like a problem. Have you checked for coolant loss inside or outside the engine? If coolant is low, it may not be reaching the sensor unless you make pump run faster. Those engines are known for head and intake gasket problems, which may be the underlying cause of what you described. A partilally obstructed radiator can give some of the symptoms but I don't thind that is it.

Posted on May 14, 2009

cadman000
  • 607 Answers

SOURCE: 1992 Cadillac Coupe Deville blower fan runs all the time

The BLOWER MODULE is located on the A/C EVAPORATOR housing located UNDER THE HOOD passenger side firewall. Has 2 electrical connectors. Mounted with 4 screw bolts.Hope this helps

Posted on May 21, 2009

  • 5546 Answers

SOURCE: MY 1999 CAD WITH 52,000 MILES HASC DEVELOPED A

If you have an electric display ATC type control there is a blower switch which controls only the blower whether its on heat or cool. On my Ford system it was under the hood in the duct work on the opposite end of the blower. Your system is probably electronic and if you replace this part it may work, mine did. You might want to go to a salvage yard and reclaim one from a wreck. You will learn where the part is and how hard it is to remove before you work on your car.

Posted on Jun 24, 2009

  • 117 Answers

SOURCE: Cooling fan runs constantly. Car overheats.

check engine temp sensor if ok check fan relay

Posted on Jul 07, 2009

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1 Answer

How long for the ac fan to start working? Ive noticed that the fan does not work when i turn the ac on, can this cause my car to overheat. I check the temp and coolant liquid both seems fine.


the ac fan starts as soon as the ac is switched on
the fan is provide cooling of the condenser before the radiator to prevent high head pressures in the ac compressor
it is the fan at the front of the car mand does not affect engine temp
there is a radiator fan between the engine and the radiator that will not start until the coolant temperature reaches a set temp at which point the ECM switches that fan on
if that fan is not working when the engine is hot , check for fan, coolant temperature sensor switch , fan relay, fuses or problem ECM

Jan 13, 2016 | AC Cars & Trucks

1 Answer

Why does my ac quit working in traffic


At 30 miles per hr you get enough air flow through the condenser coil to keep the A/C cooling. Check the cooling fan at the radiator. It should run when the A/C is on no matter what the engine temperature is. When the freon is low enough to affect cooling it will do the same in traffic or on the road. Engine coolant level has no affect on the A/C,.The condenser is forward of the radiator. You didn't say the car was running hot.

Jun 14, 2014 | 2005 Ford Taurus

2 Answers

Why car isn't blowing cool air except while driving fast?


Are you saying the air coming out of the vents is not cold unless you are moving ? Or there is no air unless you are moving ?
And are you sure the radiator fan is running with the ac on ? Can you feel air being pulled thru the condenser ? What are the gauge readings with the ac on and the engine at idle ?

May 18, 2013 | 2003 Mitsubishi Eclipse Coupe

1 Answer

Toyota Corolla 1995. Quality of air conditioner reduced when stopped (traffic light) or moving at slow speed (condenced city traffic) No problem on the highway. Checked freon gas and fan. Understand that...


Normal, the ac heat exchanger condenser need air moving across the fins to remove the heat. While moving in town the condenser isn't remove the meat that is building up the it's aluminum fins. Even though the vehicle uses an electric fan. The fan is used to cool the engine temperature. If you Toyota is equip-ed with automatic transmission. The electric fan will need to pull enough air to cool the engine temperature, automatic transmission fluid, air conditioner condenser, and maybe power steering condenser to cool the power steering fluid. Later model of vehicles/trucks are using different refrigerants instead R134A in which you Toyota uses.

The simples way to explain is the ac remove heat from inside your Toyota and this heat is removed by the refrigerants inside your ac in the car. To cool the refrigerant this coolant is removed to the heat exchanger condenser located in front of the engine radiator. So, while moving at 60mph there is enough air flow through the radiator, ac head condenser, and other aluminum heat exchangers. GB...stewbison

Sep 12, 2011 | 1995 Toyota Corolla

1 Answer

Air conditioning not too cold ??


Hello,
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Let me explain in layman's terms how the air conditioning (AC) system works and what could be happening to your car.

Like your body, the air conditioning compressor is the heart of the AC system, and Freon is the blood. The compressor pumps Freon throughout the AC system, either the older type R12 which costs as much as gold it seems these days, or the new environmentally-friendly R134A Freon. This Freon is a gas and liquid combination that is compressed and circulated throughout the air conditioning system. The compressed Freon is pushed through the system under pressure and is passed through different sized metal and rubber hoses and a special valve called an expansion valve that cause the gas to expand and contract.

This expansion and contraction makes the Freon gas very cold. This cold gas makes its way via metal lines into the dash area of your vehicle to the evaporator core. This evaporator core is like a small radiator, except it has cold Freon circulating inside and not hot antifreeze. A small fan (the AC blower fan which you control from the control panel on the dash) sits in front of the evaporator core and blows air across this cold evaporator and then through the vents inside your vehicle.

The other objective of the air conditioning system is to remove the heat from inside the cab of the vehicle. This heat is removed by the Freon with the help of the AC condenser located at the front of the car (usually in front of the radiator). The Freon coming back from the evaporator carries the heat from the cab to the condenser via rubber and metal hoses. Just like your radiator, the condenser is lightweight aluminum with many internal winding coils.
The Freon travels through these coils, and in between these coils are small slits or fins that the Freon is forced through. The condenser will have an electric cooling fan mounted in front or behind it to push or pull air through these fins to remove the heat from the Freon. Some vehicles still use the old fashioned fan blade driven by the engine to pull air across the radiator and the condenser.
Now I know that is just a tidbit of information on how the air conditioning system works, and it is very general, but I wanted you to know what to look for to give you insight as to what might be happening with your vehicle.
A few causes of low cooling efficiency or no cooling at all at idle are:

Lack of air flow across the condenser. Make sure the electric cooling fan motor near the condenser is coming on, or in models that are equipped with a fan blade make sure this fan is turning and is turning very fast.

Low Freon levels. Freon level and pressure should be checked by your certified air conditioning mechanic.

Overheating. If the engine is running hot or overheating, it can have a noticeable negative affect on the air conditioning system. Some cars have two electric cooling fans, one for the air conditioning condenser and the other for the radiator. Make sure they are both working properly. Usually at idle on a hot day with the AC on both fans will be on.

When the vehicle is traveling at freeway speeds, the compressor is pumping the Freon throughout the system much faster and harder than at idle. There is a dramatic increase in air flow across the condenser due to 55 mph winds, and the engine is usually operating at a cooler, more efficient temperature as well, thus allowing the air conditioning system to operate efficiently.
Note: An air conditioning system that is somewhat low on Freon can still feel comfortable at freeway speeds due to the added air flow across the condenser which can overcome the ill effects of slightly low Freon. Periodic air conditioning performance checks by your mechanic are the best way to keep the system in great shape.

Hope this helps.

Goodluck

Oct 08, 2010 | 1998 Cadillac DeVille

2 Answers

The ac quit working...no fan, no air. The 30amp


check the ac blower transistor under passenger side of dash behind the blower motor. on my 2003 compressor would not cut on , front blower only operated on high an blew hot air, rear blew on all speed but only hot air. $58.00 at dealer plus tax. 15 minute fix. there is a video on youtube that documents the process. just fixed today

Jul 05, 2010 | 2006 Honda Odyssey

1 Answer

The condenser fan blew out and damaged my radiator on a 2005 civic ex. The car is over heating and as the temperature needle goes up the radiator fan does not move. It only moves if I put the air on and...


hi
1st u have to replace condenser fan and radiator assy , it will solve your problem , cause due to no coolant radiator fan is not working and cause of engine overheating a/c system got trip . replace both condenser fan and radiator and put new coolant. thanks.

Mar 29, 2010 | 2005 Honda Civic

3 Answers

2002 Dodge Durango AC seems to be warmer as outside temp goes up???


have the coolant fan clutch replace and wash the radiator and condensor out

Jul 19, 2009 | 2002 Dodge Durango

1 Answer

2005 sprinter 3500 88000 mi ac clutch will not engage is there an in line fuse? coolant is full please help!!!


coolant level has nothing to do with ac operation.freon level needs to be checked. a high pressure or low pressure situation could prevent operation. condensers have been known to leak right behind ac fan

Aug 07, 2008 | Dodge Sprinter Cars & Trucks

1 Answer

1998 Ford Windstar AC compressor


They get more than warm, but not excessively hot that you can't touch it. This can be caused by a faulty condenser fan motor, dirty condenser coil even low freon, which is my guess along with a dirty condenser. Check these two issues and if it's not the problem your compressor may be getting ready to die. because of internal issues with the motor windings. Make sure the fan is running to speed, clean the condenser and see if the larger copper pipe to the compressor is ice cold and sweaty, if not you may need freon

Jun 21, 2008 | 1998 Ford Windstar

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