Ok, this is the 2nd time my car has done this to me and im about to leave in the morning to drive 300 miles and i dont want something to expletive up on the way.

Now, on the days its done it its been really hot and about 3:30 in the afternoon. While im on interstate my temp needle will rise to about 2/3-3/4 the way up but if i turn on my heater it shoots back down to where it always is (which is right under halfway). Should i be worried? Any kinda tests i can do?

 

Have you checked your radiator? Do you have plenty of coolant? Are there any leaks anywhere? Check your thermostat as well.

 

Thermostat is good, no leaks, and i had half a tank in the reserve and the radiator was full

Now as for the condition of the radiator...im not sure. I did flush the antifreeze as best i could and refilled with Prestone

 

My del sol vtec is doing the samething. My car has about 135k on it I gurantee its the factory thermostat that came with the car. I'm willing to bet assuming you never changed your thermostat that its just old age & slow to open. Replace it with a OEM Honda & let us know the deal.

 

there also might be a air pocket somewhere in the coolant sysytem

 

always a possibility

 

i burped it and bled it twice

 

What year car, mileage & ever change the thermostat?

 

its a 1993 Civic EX sedan - 222, 463 miles

ive only had it for about a month...so no i havent ever changed it. But letting it run in the driveway it opened and circulated the coolant. I think the radiator is shot.


Modified by brockscivic at 1:11 PM 7/31/2006

 

Ok, but just because it still opens up doesn't mean its completely efficient. Over time, the wax kinda breaks down & is slower to open or sticks. Mines still works as well but I notice on really hot days mines does the same on the hwy but hey, it maybe your radiator also. If you do replace your radiator change the thermostat too (OEM).