Car overheating on start up - why?

[MyCord]

I bought the car from my brother last summer. I haven't insured it yet so it mostly sits in the driveway. I do start it often and drive it around the block now and then. Recently I did these things for maintenance:

- Coolant flush
- Coolant Hoses
- Trans Fluid
- Cap/Rotor
- SRI
- Fuel Filters
- Wires
- Valve Cover Gasket
- Cleaned TB/IACV/FITV
- PCV Valve/Grommet

I have 4 quarts of 5w-30, 4 NGK iridiums, and a thermostat to put it but the thermostat is not Honda brand so I've been hesitant to put it in.

I've run the car with all of these things before and it hasn't over heated. Before I bought the car my brother said the car would overheat a little when he had the A/C on during long highway drives. I figured I fixed it or it fixed itself or something since it hasn't been apparent.

Yesterday I jump started the car and notice the temp gauge went up 1/4th inch right away, then slowly went up after. I figured it was a flook.

Today I started the car to bring it into my garage to do the oil/plugs and it shot back up 1/4th right away. Whatever right? So I pull in the garage and pop the hood and the thing is sooo hot, after running for 5 min it should not be that hot. I did not rev it or anything, I never went past 3k rpm. The main radiator hoses were extremely hot.

What could cause this to happen so suddenly and so fast?

Thanks for any help!

[japspecb7]

thermostat not opening up.

[Leung]

the same thing is happening on my truck, i guess i should stop by auto zone and get me a new Tstat then.

[NAiL05]

1. Bleed it right?
2. Your brothers overheating while driving is prob the secondary fan not turning on.
3. If that fails could be just a bad tstat.

When they were hot were they equally stiff?

[MyCord]

1. Bleed it right?
2. Your brothers overheating while driving is prob the secondary fan not turning on.
3. If that fails could be just a bad tstat.

When they were hot were they equally stiff?

I can't remember if they where equally stiff, but when I squeezed the top radiator hose it make a weird squeaky noise.

[MyCord]

Well, I'll replace the t-stat today and see if that fixes the problem.

[Leung]

i just replaced mine on the truck and it runs a lot cooler now.

[Ralphie]

Yea sounds like my problem....

Tstat not opening...upper hose was hot as balls but the lower hose was cold...

and sometimes on the highway it would flucutate but my fans were ok just not cooling it good enough lol.

[Leung]

Yea sounds like my problem....

Tstat not opening...upper hose was hot as balls but the lower hose was cold...

and sometimes on the highway it would flucutate but my fans were ok just not cooling it good enough lol.

yeah this was what was happening to me.

[MyCord]

Yea that probably is the problem. Although, I just discovered when I squeeze either hose, the top or the bottom, it makes a clicking noise inside the thermostat housing. Is that noise normal or is something broken in there?

[addict_cb7]

i got a fail-safe thermostat after my cars overflow was smoking and i could smell coolant. so yeah it ran me about 25$ and its not a honda thermo neither so as long as the gasket and equipment fit, use it.