Temp. Issues: '97 EX

[Hayden_Fourroux]

Hey all. I have a 97 EX (D16y8) that warms up quite a bit while stopped. About 3/4 of the temp gauge. Now I have tested the fan, motor, relay and all are working. I replaced the radiator about a year ago and just replaced the rad. cap. Now ive noticed that my coolant in the overflow boils, so i replaced the rad cap. Still "overheats". So what else could it be? Coolant is also just over a year old. Thanks in advance guys!!

 

[lethal6]

Thermostat is stuck closed.

 

[JohnS.]

I'd say check the thermostat as well. I've replaced mine a few times.

 

[Hayden_Fourroux]

Ok, I did test the T-stat. It does open and close. It appears to open around 180 degrees. Does that sound about right, because on the T-stat its self it says 78 degrees Celsius which is about 172 degrees F. Also oil is not milky, I just checked it this morning. I guess maybe the only other cause could be air in the cooling system??

 

[XpL0d3r]

Yeah could be air in the lines.

Either jack the front end up, use ramps, or park on an inclined driveway
Start the car and turn the heat on to full blast
Remove the radiator cap and fill with coolant. Wait until car is at operating temp (fan kicks on)
Lightly rev the engine a little, squeeze the lower rad hose. Coolant level might drop a bit, and you might notice air bubbles coming from the radiator. Just keep topping it off and keep going until no more bubbles are there.

You can also bleed the system by using the bleeder valve and this method (start with step 8)

 

[Kenneth]

Get a block tester. Do the test. Easy, simple, cheap.