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1999 Chevy S-10 overheating

Tiny
CALEBOB77
  • MEMBER
  • 1999 CHEVROLET S-10
  • 4 CYL
  • 2WD
  • MANUAL
  • 120,000 MILES
Truck runs hot when driving, but the temp actually drops at idle. Heater has stopped working as well, will come on periodically, but not consistent. When the truck runs hot, turning on the heater will drop the temp a little. There is a slight odor of antifreeze after this happens, but not inside the truck. I believe I have this narrowed down to three possibilities: 1) Heater core is about to go bad. 2) Thermostat is bad. 3) Losing vacuum in the cooling system.
any ideas?
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Thursday, October 29th, 2009 AT 11:32 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,401 POSTS
Is the cooling system full of coolant? Have you checked the thermostat? Does your vehicle overheat any time or only at highway speeds or in city driving? Have you ever had the cooling system serviced?
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Thursday, November 12th, 2009 AT 10:40 AM

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