1987 Cadillac Deville Worning Light

Tiny
DRSHOR
  • MEMBER
  • 1987 CADILLAC DEVILLE
Engine Cooling problem
1987 Cadillac Deville V8 Front Wheel Drive

A red color worning light on the pannel ssaying
"Coolant Temp Fan" is coming on shortly after I sstart driving. The Air compressor stops working, and blowing hot air.
The compressor is new and worked fine for two weeks. The radiator is new today, together with a thermostat. Both fans are working. I don't have any idea what's the problem.
Is there any other thing or a sensor that is missing.
Can yoy help please.

Thanks,
Amnon
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Monday, July 5th, 2010 AT 10:54 PM

13 Replies

Tiny
FACTORYJACK
  • EXPERT
If you press and hold off and warmer on your climate panel, what are the codes that display. The will display on the fuel data center, and will be prefixed by an E of an F. The ones we could be concerned about will be F codes, F41, F48 for example. Initially there could be a fault with the body control module, or the coolant fans control module. In this system, they work together.
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Wednesday, July 7th, 2010 AT 10:47 AM
Tiny
DRSHOR
  • MEMBER
I pressed and held the OFF & WARMER bottons and it cycled through E and F codes and than, it said.7.0 and I pressed the econ than it registed F.8.0.
How can I tell what is going on?
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Wednesday, July 7th, 2010 AT 4:24 PM
Tiny
FACTORYJACK
  • EXPERT
7.0 indicates that all codes have displayed. After you press of and warmer, it will display codes. If it just goes to 7.0 then there is no codes. That system can do several things through the climate panel, you can read sensor data, execute overrides, and perform switch tests.
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Wednesday, July 7th, 2010 AT 10:43 PM
Tiny
DRSHOR
  • MEMBER
Thanks for the reply. When I push the bottons, it goes through the codes, however I have no idea what they mean. Can I override the sensors and force the AC to work? If so, how?
Thanks
Amnon
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Thursday, July 8th, 2010 AT 12:20 PM
Tiny
FACTORYJACK
  • EXPERT
I wanted you to give me the codes and I will tell you what they mean. This is to find out if they have any relevance to your concern. You might be able to override and make the a/c compressor come on, but that is just for test purposes, and will olnly occur when in diagnostics. The reason the compressor may be shut down, is for protection. If there is a leak in the system, you would not see it, or smell it. If the compressor continued to run, it would eventually seize. The refrigerant also carries oil for lubrication. When you select auto on your climate panel, does it default to econ on it's own?
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Thursday, July 8th, 2010 AT 10:43 PM
Tiny
DRSHOR
  • MEMBER
Thanks again, I believe there is no leak, the compressor comes on and the light is on auto and stays this way even after the red worning light comes on. However the compressor stops when the red light is on,
The codes are E2-22 & 52 & EE and F13 & 49 & FF
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Friday, July 9th, 2010 AT 11:15 PM
Tiny
FACTORYJACK
  • EXPERT
In theory, the vehicle is overheating. Does it seem to be overheating? If the cooling system has been drained, sometimes these motors can have some air trapped in the cooling system. When the red light is on, can you touch the upper radiator hose, is it hot? If it is not hot, there is no flow. This could be for a few reasons. The thermostat is not open(if there is air behind it, it may not open). There could be a restriction in the system, if you replaced the radiator I would not suspect that. The water pump could be faulty, have never seen it but it is a possibility. You could also have a blown head gasket. Is the coolant level full? Here is what code description for F49 states.

DESCRIPTION:

To protect the vehicle's cooling system from overheating, the BCM commands the compressor clutch to disengage if the coolant exceeds 126 C (259 F). Also, if the A/C high pressure refrigerant temperature exceeds 93 C (200 F), the clutch is turned "OFF" to prevent refrigerant "blow-out." Code F49 is stored by the BCM whenever the clutch is being disengaged due to one of the above conditions. Customer complaints of "insufficiant cooling" or "engine overheating" may be associated with this code. If a hard or intermittent code F49 has been stored, the coolant and refrigerant systems must be investigated for the cause of a high temperature condition. Possible causes would include blockage in coolant flow, blockage in refrigerant flow or insufficiant air flow over radiator/condenser.

Sorry, at first I was mislead, and what misled me was the word fan. If I remember right, this also has a cooling fan warning light, and there is different diagnostics associated with that. It sounds like you have an overheat condition for some reason.
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Friday, July 9th, 2010 AT 11:32 PM
Tiny
DRSHOR
  • MEMBER
Thanks again for your help, I will continue to inverstigate. Have a nice weekend
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Friday, July 9th, 2010 AT 11:50 PM
Tiny
FACTORYJACK
  • EXPERT
One other thought, do you have heat coming from the heater?
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Wednesday, July 14th, 2010 AT 10:23 PM
Tiny
DRSHOR
  • MEMBER
No heat is coming
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Thursday, July 15th, 2010 AT 2:11 AM
Tiny
FACTORYJACK
  • EXPERT
If there is no heat, you could have two possibilities. Either there is an air pocket in the system, or the thermostat is not opening. No coolant around the thermostat can prevent it from opening. There is a hose that comes from the heater, it has an elbow and changes diameter where it connects to the thermostat housing. On the other end it connects to either a plastic tee, or the heater control valve. If you disconnect this hose at the small end, tilt it up, and pour coolant(or water) down it into the housing, you are filling the chamber behind the thermostat. Reconnect it and run it. That is essentially filling up the chamber behind the thermostat, and the warming may warm it. If you look at the geographics of it, it sits the highest in the system, above the radiator fill. That is where air can get trapped. When you get heat from the heater, that will indicate you have flow, and it should no longer overheat.
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Thursday, July 15th, 2010 AT 8:43 PM
Tiny
DRSHOR
  • MEMBER
Thanks I'll try that
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Friday, July 16th, 2010 AT 12:22 PM
Tiny
2CARPROS LINSEY
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Thank you for using 2CarPros. Com. We appreciate your donation and look forward to helping you in the future.
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Monday, July 19th, 2010 AT 1:50 PM

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