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Ed Kelley

Ed Kelley 4/23/2011

1980 Chevrolet P30 Step-Van 8 Cyl 7.40L

Engine

engine was rebuilt at a shop. new raditor, water pump, fan clutch, fan, thermostat. Teated for exhust in cooling system

enginge will idle at about 170-180. when you dive it goes up to 220-230. only put on 300 miles since I picked it up at the shop. In a motor home. I think that's to hot. Never had heating problem before!

3 Answers


Bill

Bill 4/23/2011

Probably have air trapped in cooling system. Take back to have them purge if possible.

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Bill

Bill 4/23/2011

Also if timing too far advanced could cause this.

Bill

Ed Kelley 4/24/2011

pressured the system! timing is @ 6 degrees

jontimber

jontimber 4/23/2011

Change the thermostat to a 185 degree. If you keep running it that hot, it will probably crack the head in the future, or ruin it.

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jontimber

Ed Kelley 4/24/2011

had 195 changed to 180, now has 160. changing thermostat does not cure the problem!

Bill

Bill 4/24/2011

Ed, There are a few other things you may want to check. A pin hole in a coolant hose will cause overheating as coolant system continues to warm up and produce more pressure. A radiator cap can cause this pressure leaking also. Check all vacuum hose lines for looseness at connections and condition, leaking vacuum could also cause this. Fan belt tightness. Fan clutch not coming on at proper temperature can cause this. And again an air pocket behind thermostat can cause this. When coolant hot check radiator hoses for collapse condition which could indicate an air pocket. I am out of ideas, except a faulty gauge or sensor.

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