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12:11:28 - 10/31/2025
General Dakota Board
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dave crawford
GenI
 
5/06/2009
11:47:42
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 Subject: overheating 4.7
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Message:
I have a 4.7 that over heats. First I replaced the t-stat and rad. cap, still over heats.Changed the water pump and replaced the radiator, still over heats. Pressure tested cooling system, leaks off. Removed spark plugs, presure tested again, coolant in rear cyl in right bank. Replaced head gaskets, retested and it held. I thought that it was fixed. Drove it about 100 miles over 2 or 3 days, still over heats. The coolant expands into the reservior each time it is driven but fails to return into the system until there is not enough coolant in the system to cool the engine. HELP. Any ideas what the problem could be. Dave
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modain
GenIII
5/07/2009
15:33:10
|  RE: overheating 4.7
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Message:
What about the radiator cap? I see you replaced it, but does it hold 20 PSI?
Coolant going into the overflow is normal. With a cap that holds pressure the fluid will return from the overflow as it cools down. Sounds like a bad cap to me.
What's your left foot doing?
==============
2002 Graphite QC SLT Plus, 4.7L, NV3500, Superchips 3715, 3.92 LSD, R/T rear swaybar, no chrome, loads o'fun...
2001 Patriot Blue Durango SLT, 4.7L, 45RFE, Superchips 3715, 3.55 Open (for now)
1999 Forest Green Dakota RC Sport, 2.5L, NV1500, 3.55 Open
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