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2004 Honda Civic heater

Tiny
LOUIED1929
  • MEMBER
  • 2004 HONDA CIVIC
  • 1.0L
  • 4 CYL
  • RWD
  • AUTOMATIC
  • 80,123 MILES
Heat very hot when driving. Heat willnot stay hot while idling. Gaugestays up
wont maintain heat Heat very hot while driving but cools down while idling at stop light or standing in driveway.
Had new water pump installed, new radiator cap cabin filters, timingbelt.
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Wednesday, January 29th, 2014 AT 3:33 PM

2 Replies

Tiny
HOMER1967
  • MECHANIC
  • 875 POSTS
It sounds like you have a restricted heater core, I would suggest a flush of the heater core.
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Wednesday, January 29th, 2014 AT 5:04 PM
Tiny
KNOWLEDGE IS POWER
  • MECHANIC
  • 1,136 POSTS
It sounds like youre not getting enough flow through the heater core. Did you replace the water pump and tstat yourself? If not id take it back to the shop that did and tell them of your heater issue. Otherwise when the car is cool. Take one of the heater hoses loose at the firewall, crank the car and check for flow. This is a line that comes directly from the waterpump. If theres no flow there at idle the waterpump is at fault
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Wednesday, January 29th, 2014 AT 5:08 PM

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