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Old 07-01-2011, 05:53 PM
five.fold five.fold is offline
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1997 f150 4.6 overheating

Hi- only second time around posting here-I recently bought a 1997 F150 xcab lariat 4x4, 212k miles, 4.6 engine. radiator was bad, replaced it, replaced heater core(leaked), new thermostat, radiator(bottle)cap, water pump. At no particular time, reason, a/c on or off, it will build pressure and spew a/f out of cap(before new cap, blew upper hose off). This has happened 3 times now in the last 2 days, always on short trips. drove all afternoon yesterday, stop and go driving around town, 100 degree outside temps, with the a/c on, no problems at all. today, driving back from golf course, about a 5 minute drive, a/f spewing out of cap by the time i got to my driveway. Bad head gasket? No white smoke, no oil in a/f or a/f in oil. also, a/c coil cleaned out. plenty of air flow from rad fan.
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Old 07-01-2011, 08:29 PM
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Sounds like you might have air in the system.
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Old 07-01-2011, 09:07 PM
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what's the best way to purge it? wont it just purge itself as i drive?
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Old 07-01-2011, 09:14 PM
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Sounds like a bad head gasket allowing compression to get into the cooling system. Start with a cold engine and put a pressure tester on then run the engine. If it starts building pressure before the tstat opens then the head gasket is bad.
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Old 07-01-2011, 09:23 PM
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thanks, 70, i give that a try tomorrow.
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Old 07-02-2011, 02:44 PM
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Ran the truck 15 minutes from cold start, only negligible amount of pressure, none at all for the first 4/5 minutes.Revved engine to 3500 several times while idling, no problems. just got back from taking it to lunch (a/c on), no overheat at all. I can, however still hear water/air gurgling thru the heater core.
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Old 07-02-2011, 04:10 PM
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Sounds like air then, you need to remove the degas cap and turn the engine on and let it run.
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Old 07-02-2011, 07:26 PM
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DEGAS CAP? If you are talking about the little valve in top of the t-stat housing, there isnt one on this truck. where else do i look?
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Old 07-02-2011, 09:07 PM
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The cap on the overflow, i.e. degas, bottle.
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Old 07-02-2011, 10:13 PM
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Oh. never heard it called a degas bottle before. I'll give that a shot.
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Old 07-04-2011, 11:57 PM
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didn't work. anyone have any other suggestions?
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Old 07-05-2011, 08:41 AM
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I heard parking on a slight incline and then try to bleed the coolant system helps
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Old 07-05-2011, 11:02 AM
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Yeah, i pulled the truck up on ramps, it made sense to try that. No luck.
Have been running engine for the last 90 minutes, revving, a/c on and off, cap on for the last 30, not even a burp! (Drove it yesterday to a 4th celebration, spewed and overheated less than a mile from the house, cooled it down, drove on to picnic-nothing. Got in and started home, same thing happened, drove a mile or so, spew and etc., cooled down, drove rest of way home-no problems.) I hate to tear into it if it isnt a head gasket.
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Old 07-05-2011, 02:39 PM
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IS your T-stat sticking?
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Old 07-05-2011, 04:56 PM
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that is looking like my next step, although I just installed this one last monday!
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Old 07-05-2011, 04:56 PM
 
 
 
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