Not trying to hijack the thread, but I am having almost the same issue.

Coolant reservoir is full, seems like coolant is pushed to it, but never sucked back again. Car shows the gauge in normal temperature range, but sometimes in stop and go traffic, temp starts to rise till half or 3/4 of the gauge. Then fan kicks in and gauge starts to go down till 1/2 or at normal point.

I have bled the system many times through the bleeder valve, fans do come on, switch 'A' and 'B' both are new. On a cold start, if I turn on the AC, seems like both fan do not come on, is it an issue? Also, I have an aftermarket thermostat(bought from advance auto), could it be a problem?

I have replaced the radiator recently and radiator cap with this one :

This random overheating and full reservoir are driving me nuts, any help or advise would be greatly appreciated.

P.S:I can start a new thread too, so please don't get upset on me, trying to prove and show that i have done search/research and trying to troubleshoot to fix this issue.

Thanks guys!

 

I just started your own thread to make things less confusing. Here is the thread you referenced:

https://www.hondaaccordforum.com/for...ng-full-50082/

I would install an OEM thermostat and try the old radiator cap. BTW, why did you replace the radiator?

 

Please also clear something up for me. If the AC works (compressor kicks on), when you turn on the AC both fans should come on...please verify/confirm this.

 

I changed the radiator, because it's leaking from the place where plastic body meets the fins.

Which thermostat(Stant, Gates, Motorad, also 180/195)? This is an aftermarket radiator, so the cap is different from the OE one

If I start the AC on a cold start, fans should start immediately or it has to reach the operating temperature? Should I keep it to the coolest position, turn on the AC and Fan, then both fans have to kick, or please correct me if I am missing something?

 

The rad fans (both) will run when the car is running and the AC is on (again the AC system is working).....cold, warm or hot does not matter.

 

Here is the update, no fan run, if I put the temperature to the coldest while turning on the AC, I have tried on a cold start, as well as when car has reached operating temperature or when the gauge is rising towards the 'Hot' region.

Is this an issue or a problem? Because I can see fans running and kicking, when the temperature gauge rise.

BTW, since last year AC does not work, not sure if fans are related to it? Forgive my ignorance

Because of all of your help and guidance, my car has passed emission test today with flying colors, so here is a "BIG" thanks to all of you guys and the forum.

 

If the AC system is not working then when you turn it on the fans will not run. They will only run when thermo a (t-stat housing) closes (~196).

As suggested, this could be a thermostat issue. Can't go wrong with an OE stat from the dealer....from there either Stant or Gates (btw-stant makes the stats for gates).

Did the radiator come with a new cap? Either way a new one is only ~$6.

 

So it means, I should not worry about the fans with the AC, correct?

Yes, I am planning to replace the T-stat with the Nippon one, because so many different temperatures and types are there for Gates and Stant. This is the cheapest one I found, if you have any other pointers or anything cheaper than this, do let me know?


Yes, it came with a brand new cap and it seems to me, Thermostat is the first start and then probably cap, what you think?

As mentioned earlier, no problem and issue while driving, issue only starts while idling or in a stop and go traffic. This is the picture I took today in the morning after a drive of nearly 1 hr:

Thanks a million again for all of your guidance, help and support.

 

If the AC system is not working then it will not "make the fans" run so no need to worry with that. It would be best to verify that they do cycle when the car gets warm. Be sure to bleed the air out of the system when you replace the stat.

You can do that when you replace the stat...Majestic Honda has it for less, don't know the difference (if any) in shipping costs.

PS- I'm guessing the pic is to prove it is a random thing.....as everything looks fine to me...idle, dead on.....temp, dead on.

 

Thanks a lot for your help, I am out of pocket and will get back to the car in few weeks.

At Majestic Honda, including S&H it's nearly $30.

It's ~$20 on amazon, trying to find something cheaper than that

Going to replace the t-stat first and will post the results and update.

Get this issue while idling or in stop and go traffic, also Coolant reservoir bottle is getting Completely Full and possibly overflowing too

Because of the above mentioned issue, posted the picture, once I will come back, will post the picture with temperature needle rising and moving towards 'H'.