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2000 Chevy S-10 overheating has air cond.

Tiny
JOHN KNOTT
  • MEMBER
  • 2000 CHEVROLET S-10
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 13,800 MILES
Overheats on hot summer days. Runs great on colder days.85 and below. Changed water pump, fan clutch, flushed engine@rad. Radiator 2 yr. Old. Fuel pump 2yr old. When you start driving the engine rpm runs up a little before it shifts, after that it shifts fine. NOW!That its winter it cranks a long time before[if]it starts. Trans still shifts to higher rpm only at first time I drive each cold startup.
4.3 v6
thanks
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Thursday, January 3rd, 2008 AT 12:40 PM

3 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Try a new thermostat? Long cranking- need to install a manual fuel pressure gauge to see if it is bleeding down pressure. If it is could be a bad pressure reg or a faulty pump. Has the check engine light ever come on? Have you ever had the trans serviced?
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Friday, January 4th, 2008 AT 7:46 AM
Tiny
JOHN KNOTT
  • MEMBER
  • 2 POSTS
I have put in new thermostat and trans rebuilt 20 months ago. Repairman said fuel pressure was ok.
Engine light cam on once, no code in computer. Put in new battery cause it was 5 years old. So far has started every time. If I warm truck up the engine rpm doesn't raise when I start driving.I am not loosing antifreeze or smoking. Plugs are clean. Oil clean. Runs perfect 1/4 mile down the road.I've worked on cars for years but, don't know what else to do if you can't help.
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Friday, January 4th, 2008 AT 10:22 AM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Had it tested for a blown head gasket?
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Friday, January 4th, 2008 AT 11:35 AM

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