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1998 Blazer: New 185 thermostat and RDO fuse reset..Whats next

1998 Blazer with no heat...
1998 Blazer with no heat. New 185 thermostat and RDO fuse reset did not help. Whats next?
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Answered in 5 minutes by:
2/7/2010
Lou P.
Lou P., ASE Certified Technician
Category: Chevy
Satisfied Customers: 5,070
Experience: building and driving chevy's since i was in the womb!!!! camaro and corvette enthusiest, access to factory diagrams and tsb's
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Hello my name is XXXXX XXXXX i will do my best to help you.

 

are the lines to the heater core near the firewall both hot or only one???

does the fan blow strong?

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Customer reply replied 7 years ago
Fan is good. The hose from the top of the water pump is not so warm, the other is warm.
Customer reply replied 7 years ago
Clogged core?
yes thats what im getting at. the blazers are famous for the DEX-COOL antifreeze to clog the core up. and flushing doesnt help so if the hoses going up to the core are warm or hot and you get no heat output then the core will need to be changed,Lou.
Lou P.
Lou P., ASE Certified Technician
Category: Chevy
Satisfied Customers: 5,070
Experience: building and driving chevy's since i was in the womb!!!! camaro and corvette enthusiest, access to factory diagrams and tsb's
Verified
Lou P. and 87 other Chevy Specialists are ready to help you
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Customer reply replied 7 years ago

I switched coolants when I bought it 6 years ago, back to the green stuff. Can the flush be a do-it yourself job?

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Lou P.
Lou P.
Lou P., ASE Certified Technician
Category: Chevy
Satisfied Customers: 5,070
5,070 Satisfied Customers
Experience: building and driving chevy's since i was in the womb!!!! camaro and corvette enthusiest, access to factory diagrams and tsb's

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