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AutoTech08, Workshop owner
Category: Honda
Satisfied Customers: 973
Experience:  Diploma in Automotive Engineering, 30 years working experience.
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98 civic: bleed..I drained the antifreeze on, change all the hoses

Customer Question

trying to bleed the rad on a 98 civic hatchback that I drained the antifreeze on, change all the hoses and thermo. It has no bleeder valve on the upper rad hose ftg like some I 've had. It still overheats unless you
run heater all the way hot.

Submitted: 8 years ago.
Category: Honda
Expert:  AutoTech08 replied 8 years ago.


Hi there,


Did you check if the cooling is coming on?

Do you have issues with the coolant level in the radiator? Check at cold engine.

Does the overheating occur only at high speed driving?


Customer: replied 8 years ago.

cooling fan comes on

no prior issues with coolant levels in rad

30-50 mph. It will run fine for 10-15 miles, and then you look at the temp gauge

and it is creeping up. throw the fan and htr on and it comers back down.

Appears to be an air pocket somewhere. Am leary about trying to find this bleeder screw people reference near the oil filter or if i even have one.




Expert:  AutoTech08 replied 8 years ago.


For 98 models, the bleeder screw has been dispensed. For bleeding, turn heater to maximum heat, run engine with radiator cap off till operating temperature, cooling fan coming on at least twice. Top up coolant if necessary. When coolant level is stable, close radiator cap and bleeding is done.


If you do not have lack of coolant in radiator, it is not due to air pockets. The cooling is inefficient and possible causes are :

1. Clogged radiator.

2. Thermostat not opening fully.