Is the AC system and the engine cooling system connected - JeepForum.com

 
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post #1 of 9 Old 07-16-2009, 04:37 PM Thread Starter
firedogut
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Is the AC system and the engine cooling system connected

I'm sure i'm going to get ripped for starting a new thread but i felt it was a new question.


Is the AC system connected to the Engine cooling system. If i am having issues with overheating could it because of compressor, r134a charge, ...etc

i don't think they are but hell i might be way off base here.

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post #2 of 9 Old 07-16-2009, 04:38 PM
justanotherjpr
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From the other post: How is your fan clutch? Did the overheat light go away? Does your electric fan kick in when the AC is on?

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post #3 of 9 Old 07-16-2009, 04:43 PM Thread Starter
firedogut
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Have not tested anything yet. just happen a few min ago and frankly its 100+ outside i might wait a few hours before i look at it.

the light went off after 1-2 min (soon after the light turned green)

lets see if i can remember how to test the fan clutch.
When i got home (maybe 4 min after the light turned on) i do recall the both fans turning.

i also notice a ton of condensation around the low pressure side of the AC system. haven't seen that a while from what i can recall.


are the two system connected?
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post #4 of 9 Old 07-16-2009, 04:44 PM
justanotherjpr
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They are not 'connected', but your engine is working harder to turn the AC compressor.

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post #5 of 9 Old 07-16-2009, 04:47 PM Thread Starter
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so i possibly fixed on issue to cause another one.
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post #6 of 9 Old 07-16-2009, 04:48 PM
justanotherjpr
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Is your coolant full? Did the coolant boil? No so much caused another one, but encountered another one. I do not think the two correlated.

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So do you actually hear your thoughts in your head or is it just sort of a dull roar before you smash your face into your keyboard and just submit whatever dumb **** ended up on the page?
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post #7 of 9 Old 07-16-2009, 04:58 PM Thread Starter
firedogut
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coolant never boiled. no steam or anything just the light. full of coolant. man i don't want to deal with the overheating again. Last time my gut told me the light just would come on early, like the sensor was bad......never replaced the sensor.

tried to spin the fan. it would only move a few inches when it was given a good spin. no free spinning
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post #8 of 9 Old 07-16-2009, 07:43 PM
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Quote:
Originally Posted by firedogut View Post
coolant never boiled. no steam or anything just the light. full of coolant. man i don't want to deal with the overheating again. Last time my gut told me the light just would come on early, like the sensor was bad......never replaced the sensor.

tried to spin the fan. it would only move a few inches when it was given a good spin. no free spinning
Fan clutch sounds good.

I think of having the A/C on like towing a trailer. Even if your system is in good shape it can run hot or overheat. It may be a sensor too, if it sending the wrong message without things boiling over, that'll trigger the light.

Get it up to temp where the e-fan comes on WITHOUT the A/C on (215-220) See if it comes on. If not, it's only running one circuit and only coming on with the A/C or defrost modes. By then the system is already running hot.

Don't know about your year but the A/C is always going to be a stresser.

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post #9 of 9 Old 07-17-2009, 10:47 AM
dmm219
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they are related in "slight" ways...but they are not connected.

A couple I can think of:
1. When the A/C is running, the condenser will be given off heat, right around the same area as the radiator, which could make your radiator performance suffer (very slight if at all noticable).
2. Running the A/C puts extra strain on the engine to turn the compressor, which could raise engine temp (again, very very slight)
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