Question about 1996 Jeep Grand Cherokee

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My heater and fan work but my AC dos'nt and wont accept the coolant.

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  • 34 Answers

Pressure switch bad? Fuse bad? Clutch bad?

Posted on Nov 18, 2013

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1 Answer

Ac heat wont bturn on


1: engine hot. 180F or more?
2: fan blows on high?
3: got heat at any vent?
AC dont make heat, only the heater coil core, does that.
it only takes 2 things.
engine coolant hot.
and air flow across said core,
both are easy to check, ask.

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89 cadillac eldorado, engine cooling fan and interior heater fans intermittently do not turn on when they should, they will reach 107Celius over heat light does not come on and coolant is circulating as it...


hi,
some vehicles have a synchronised twin electric fan system that operates only when the AC is turned on, can you manually turn off the AC and see if that changes what you have just described.
If not then the climate air ( AC ) sensor may be faulty.

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How Can I get my 2003 pontiac grand Prix cooling fans to work ?


check cooling fans fuse and relay.bad engine coolant temperature sensor will cause coolant fans not to turn on.if AC system not working with no refrigerant in the system cooling fans wont turn on when you turn on the AC.problem in PCM will cause fans not to turn on.

Sep 26, 2013 | 1994 Mitsubishi Magna

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Engine cooling fan only works when ac or defrost is on


if engine at long stand still,the engine temperature will rise about 190 degrees the cooling fan suppose to automaticaly turn on when coolant temperature sensor get hot it cause its resistance decrease causing pcm to send power to coolant fan relays and cooling fans, when you turn on AC the cooling fans suppose to turn on to cool down AC CONDENSOR, IF NOT AC WONT WORK COOLING FAN COOLS DOWN REFRIGERANT SO IT CAN RECYCLE THROUGH THE SYSTEM AGAIN.your cooling is suppose to turn on when engine at a sit still if vechicle not moving as coolant temperature rises at a set point the cooling fans will turn on cool down engine.cooling fans dont turn on when you first cold stsrt vechicle unless you have AC SWITCH ON.if cooling fans dont turn on when vechicle at a long stand still or moving along slow traffic.if coolant temperature sensor been replaced and fuses and relays okay have dealership check see if pcm driver circuit working faulty pcm will cause cooling fans not to turn on.

Sep 27, 2012 | 1996 Buick Century

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AC fan not working


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Jun 06, 2012 | Cars & Trucks

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89 saturn fan does,nt kick on


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Jan 06, 2010 | 1999 Saturn SL

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The cooling fan on my 2001 Mustang runs constantly. Even when the engine is cold. The temperature gauge reads normal. The engine has 39,000 miles. What is the problem?


low engine coolant ,coolant temp. switch for the fans,fan relay shorted closed.and possibly a computer.check for codes,coolant level in radiator when cold,remove relay for fan and see if the fan stops. check to see if the ac is on or if the heater ac switch is in defrost position. ac will be on and coolant fan is commanded on also.i hope this will help.

Oct 27, 2009 | 1995 Ford Taurus

1 Answer

Heater and ac


how about some more info man. do you mean the heater fan is not blowing air? if that is the case it is easy to fix. most cases it is a fan motor or a blower motor resistor. if you are getting air flow but you can't switch it from hot to cold. it could be a blend door. that is a relativly large job. the dash would have to come out. do the coolant lines to the heater core both get hot? if not the core could be pluged. does your a/c even kick in or work. you could have many problems causing this.

Nov 15, 2008 | 1999 Mercury Cougar

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Car problems


Hi,

In my country, most overheating issues on Volkswagen models are resolved by:
  • entirely removing the thermostat (not applicable in cold regions);
  • wiring the fan to switch on once the engine is running (with or without the A/C or heater being turned on);
  • replacing the radiator thermal switch for the fan to a lower temp.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Aug 14, 2008 | 2001 Volkswagen Jetta TDI

2 Answers

Heater control wont heat. AC and fan works fine


mechanical or vacuum operated valve that releases hot coolant into the heater core may be stuck closed. or the heater core may be clogged. hope this helps.

Aug 10, 2008 | 1997 Pontiac Bonneville

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