1991 Chevy Silverado 14 heater cores

Tiny
1991DUALLY4X4
  • MEMBER
  • 1991 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 179,000 MILES
I am the second owener of my truck and on the 2nd year of ownership I started to blow heater cores. Currently I am on #14. The heater core has been tripple grounded and since this all started I have replaced the motor, radiator, water pump. All of this has been completed by a chevy dealership and 4 of the heater cores have been done by and outside mechanic. All certified and all came with warranties. Each heater core will last 6 - 12 months depending on how often I drive my truck. Half of the time is with a fully loaded camper pulling a boat and the other half of the time is just normal driving.

hope you can help!


John
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Tuesday, December 23rd, 2008 AT 2:02 PM

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Tiny
BLACKOP555
  • EXPERT
Are you using a brass, copper, or aluminum heater core?

Also try a different kind of coolant. Might be incompatable.

Check the voltage of the cooling system to see if theres not enough grounding, shoudl be good due to the fact that the radiator isnt going out?
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Tuesday, December 30th, 2008 AT 8:06 PM
Tiny
1991DUALLY4X4
  • MEMBER
I am using an aluminum heater core and have tried a different coolant. The dealership check the electrolysis after changing the heater core and it was still a bit high.

Thank you for your help.

John
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Tuesday, December 30th, 2008 AT 10:05 PM
Tiny
BLACKOP555
  • EXPERT
Cut your heater core hoses and put in brass pieces and hook grounding straps to them too to even further get rid of the problem.

The next thign could be you are gettign too much flow through the heater core, you may have to add a flow restrictor in one of the lines to slow it down a bit.
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Wednesday, December 31st, 2008 AT 3:39 PM

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