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Steve
Steve, Honda Mechanic
Category: Honda
Satisfied Customers: 3441
Experience:  13+ years with Honda,ase certified over 25 years
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Second opinion] Takes awhile to get up to temperature and

Customer Question

Second opinion] Takes awhile to get up to temperature and then drops to cold while idle
JA: How many miles are on the car? Have you checked the coolant level?
Customer: About 180000 miles got a new thermostat got the system let out really well coolant is full
JA: What is the model/year of your Honda?
Customer: 2003 Civic with a 1.7
JA: Are you fixing your Civic yourself? What have you tried so far?
Customer: Noticed it while idling would drop too cold put in a new thermostat bled the system new coolant work fine for a little bit and then the issue came back but not as bad
JA: Anything else you want the mechanic to know before I connect you?
Customer: I don't believe so
Submitted: 6 days ago.
Category: Honda
Expert:  Steve replied 6 days ago.

Does the heat in the car also go cold at idle?

Customer: replied 6 days ago.
Is the heat in the car as well as the temperature gauge drop to cool. It was to the point where it would drop to almost totally cold so the thermostat was replaced and then it started doing it again but not as bad.
Expert:  Steve replied 6 days ago.

To verify this you would need to do a cylinder leakage test but I am very confident that you have a blown head gasket.