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Old 09-04-2012, 11:06 AM   #1
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454 overheating

Our 89 southwind has been issue free until yesterday. On the highway the heat guage began to rise to just below the red indicator(running air,at appx 65mph.We pulled over,cooled down and checked radiator...all seemed fine. Got back on the road (without air) and all seemed well. The aux fans,and cluth fan seemed fine,and good temp. Turned the air on while the fan was roaring and the fan shut off and the temp started to climb...shut off air,and the fan kicked back in and temp went to normal range. I dont know if I'm hearing the aux fans,or the clutch fan,but when the air is turned on (at over 55mph) the fan shuts down. Traveling at 45-50, the fans seem to operate as they should with the air on and no issues ?? Could it be a pressure switch o the compressor? Thanks for any help

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Old 09-04-2012, 12:23 PM   #2
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I believe the clutch on your air conditioner unit is failing. Check that out first.

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Old 09-04-2012, 12:33 PM   #3
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My suspicions were something to do w/the a/c or switch, rather than fans,radiator,or cooling system...thanks
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Old 09-04-2012, 12:47 PM   #4
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Water pump. Had same issue with 84 454 on a Winnebago. Fan was spinning fine but water pump not circulating water. Mostly under power and when ac on.
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Old 09-04-2012, 08:29 PM   #5
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I just purchased a '95 Vectra with a 454. Bought it out of town and on the test drive everything was normal, but on the way home (about 97 degrees outside) the temp gauge climbed close to the red at 70 MPH and would come back down to a little over 210 at 65 MPH or less. The fan clutch kicks in when the temp goes up (as it should) and releases when the temp goes down. I didn't notice much difference with AC or not. I'm going to add Water Wetter Super Coolant and see if that helps any.
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Old 09-04-2012, 10:58 PM   #6
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trackman, Please explain....knowledge is a good thing..I like to learn...fill me and the OP in on your reasoning
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Old 09-04-2012, 11:10 PM   #7
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Old 09-04-2012, 11:47 PM   #8
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My 85 would do similar, Belts were slipping. Gotta be real tight.

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Old 09-07-2012, 03:54 PM   #9
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water hoses are made in layers and delamanate (sp) with age and the inside layer collapases and restricts the water flow. not saying this is your problem but something to to check
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Old 09-07-2012, 04:22 PM   #10
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Very first thing to do is see if BOTH your AUX fans and Clutch Fan are working. What you describe it sounds like the Aux fans are not, and prolly havent been for awhile, and now your Clutch fan is going.
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Old 09-08-2012, 06:22 PM   #11
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If you have good air flow to the radiator while moving and it is overhearting, it is not a fan issue.

When ac is on the ac condensor is using the air first to cool the freon and the warmer air is used by the radiator which causes the engine temperature to rise.

When engine gets warm, turn off the motor and make sure the electric fans cannot come on and put your hands on the radiator and see if it the same temperature in different spots . That will tell you if the radiator has a blockage.

Check your thermostat and if your hoses are old go on replace them that will elimanate those issues

The last thing is check the water flow of the water pump, an easy way to do this is to drain 4 or 5 inches of water from the radiator and leave the cap off and after the tstat opens you should see water flowing through the radiator.

Are you losing coolant but do not see any leaks have the system pressure tested? If it leaks down you may have a head gasket issue. I have seen several cars like this.

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