So I had to go somewhere this AM 2 hours away. About a hour and a 15 min into the trip my temp guage starting rising to about halfway. Stayed that way for another ten min. Then creeped up to about 75%. I pulled over and the temp started to go down slowly. Checked under the hood and the hose at the top of the radiator is hot. Hose coming out of the bottom is not hot at all. I have 160k. Timing belt a and water pump done at 92k. Any ideas?

 

Maybe the bottom one got clogged up try pressing the entire hose to see if you can feel anything blocking one of the hoses and check the resivoir for fluid.

 

clogged radiator
drain some fluid and look inside thru cap opening at slits
also test cap,,those fail all the time

How old is the coolant,,5 years MAX after first 105 service
you usually run 1-2 lines below half on temp?

the driver fan running when its supposed to?
runs more than 1-2 minutes after normal shutdown recently? = bad fan temp sensor
major cause of overheats in stop and go conditions

 

Fan only stays on longer than usual if I pull up and just get out of car and it's already warm. If I sit for a couple of min. With the car running and then get out or car hasnt been running flr a while fan doesn't come on.

 

ck that fan operation---sit at idle and wait for it to cycle on and off a few times to maintain temp

if sensor not replaced yet start there, aftrmarketpart ok

system burped?

 

Do you have a part number for that sensor?

 

what am I the acura parts dept?
its called fan temp sensor `A`
screws into lower corner of rad (except 99s)

but the first issue is no temp at lower hose
is there flow thru the rad- observe with cap off
does it change with rpm increase to 2000--then let it down gently or it will backwash out the filler

drain on lower driver corner of rad--sample fluid

 

So I checked today while car was up to temp. Fan does cycle on and off every few min. But both fans are doing it. Is this suppose to happen. I'm changing that fan switch this weekend. And when fan does cycle on it doesn't blow as hard as it does upon engine shut down

 

both fans?,,NO!!
turn AC off,,retest
only driver fan cycles in normal temp operation

ac fan always runs to compensate for added heat of ac in front of rad

swap the fan relays with ones of same color

never noticed or heard different speed ..does the fan blade spin freely by hand?

 

Yes the A/C was off. An yes the blades do spin freely I'll try swapping the relays in the am

 

Slow overheating on the highway is a textbook symptom of a radiator. It's usually the cooling fins corroding away from the tubes more than clogging or restriction. Also look in between the condenser and radiator for a layer of pollen type crap. [if so blow it out with compressed air] I suspect your fans will act normally when you take care of the first problem.

 

failure to replace coolant--it goes acidic and eats its aluminum home