2004 Chevy Colorado voltage being generated by coolant no b

Tiny
TIM1964
  • MEMBER
  • 2004 CHEVROLET COLORADO
Heater problem
2004 Chevy Colorado Two Wheel Drive Automatic 103000 miles

The truck is now working on its third heater core. I dicovered that at operating temp with the battery disconected. Using a DVOM between the engine block and the coolant that 0.56 volts is being generated in the system. I tried flushing the the cooling sys until it only has clean water in it but the same problem persists. Any help would be greatly apreciated.
Tuesday, January 12th, 2010 AT 6:04 PM

4 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
What kind of cores do you keep puting in it? Brass copper or aluminum?

Have you checked all of your ground levels? Also if you use the wrong tyope of coolant you can cause the vehicle to corrode out the cores.
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Tuesday, January 12th, 2010 AT 6:42 PM
Tiny
TIM1964
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Alumium heater core is the only thing available. Grounds should not be an isue since this still occurs with the batt disconected
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Wednesday, January 13th, 2010 AT 7:14 AM
Tiny
BLACKOP555
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How long does each core last and does it go out at a specific time of year? I.E summer, fall, winter.

It still gets.56 charge in the cooling system with battery disconnected? Thats still a pretty high voltage.
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Wednesday, January 13th, 2010 AT 1:37 PM
Tiny
TIM1964
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Heater core lasted 1 month. The problem is now fixed after multiple flushes and and adding fresh coolant. Voltage when hot now is.20 or below.
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Thursday, January 14th, 2010 AT 7:11 AM

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