What's the difference between the 0.9 and 1.1 radiator cap?

Tiny
WENDYLEE
  • MEMBER
  • 2000 HONDA ACCORD
  • 275,689 MILES
And which one should be used on the 2000 Honda accord torneo shape? I keep having an overheating problem; changed all the radiator hoses was using a 0.9 cap but it is not holding the pressure as the cap is worn tried to get another but unable to locate it, the mechanic suggest I try the 1.1 I told hi I tried that before and whenever I use it the car overheats, I keep having to top up the overflow bottle before driving I was having that problem with the 0.9 too that's when I found out I had a leaky hose so I went ahead and changed the out.
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Saturday, April 21st, 2012 AT 10:17 PM

9 Replies

Tiny
KHLOW2008
  • EXPERT
Hello,

You should be using the 1.1 radiator cap which is recommended for your car. Please let us know if you need anything else to get the problem fixed.
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Sunday, April 22nd, 2012 AT 5:13 AM
Tiny
WENDYLEE
  • MEMBER
  • 2000 HONDA ACCORD
  • 275,689 MILES
I a having a overheating problem especially when using the 1.1 radiator cap
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Tuesday, February 12th, 2019 AT 5:58 PM (Merged)
Tiny
MHPAUTOS
  • EXPERT
The higher the head pressure on the coolant the higher the boiling point, so if it is overheating with the 1.1 cap there will be other issues causing the over heating, check thermostat, radiator for restrictive flow and cooling fans first.
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Tuesday, February 12th, 2019 AT 5:58 PM (Merged)
Tiny
STYRU
  • MEMBER
  • 1995 HONDA ACCORD
  • 200,000 MILES
Small hole right under radiator cap on neck of radiator, beside overflow hole.
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Tuesday, February 12th, 2019 AT 6:00 PM (Merged)
Tiny
WRENCHTECH
  • EXPERT
There is no such thing as a "weep hole" in a cooling system. Over pressure is diverted to the overflow bottle and then drawn back into the system when cooled.
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Tuesday, February 12th, 2019 AT 6:00 PM (Merged)
Tiny
THEDARKELF
  • MEMBER
  • 1997 HONDA ACCORD
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 136,000 MILES
Hi! This is my first question.

I've owned a 97 Honda Accord for two months and I'm not being lucky.

To celebrate the car purchase I drove from LA to San Francisco and back without any major issue.

One month later, I decided it was time to get the oil change since I didn't really know when the last change had been performed.

I got my oil changed and a courtesy check. They suggested some repairs I declined (like draining the cooling system) just because I didn't plan to use the car extensively.

After 15 miles driving (two days after the oil change) the car engine is suddenly overheated. The temperature gauge rises and I pull the car off the freeway. I open the hood and I see the radiator cap is half open and coolant liquid is poured everywhere.

I got towing assistance and at the repair shop they tell me that the engine is severely damaged. The bill ascends to $1500 and the car is still under repair (only one cylinder had water inside)

I want to know if there's any possibility for the radiator cap to open itself (maybe due to excesive pressure) and if I can have arguments to blame the mechanic responsable for the oil change and the courtesy check (they say they don't touch the cap for any reason during the courtesy check)
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Tuesday, February 12th, 2019 AT 6:00 PM (Merged)
Tiny
MHPAUTOS
  • EXPERT
Hi there,

This is really a case of there word against yours, a radiator cap will not undo it's self, but if it was removed and not re fitted correctly it may dislodge under pressure, but as I said, your word against theirs.

Mark (mhpautos)
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Tuesday, February 12th, 2019 AT 6:00 PM (Merged)
Tiny
THEDARKELF
  • MEMBER
Thanks for the quick response! I went to the place I got the oil change and talked to the manager. He adopted a very defensive position, saying that his guys don't touch the cap to perform a visual inspection. He said that the cap could come out under very high pressure and if the cap had been open when I left the repair shop I should have noticed smoke before two blocks (this is fun because the parking lot where I leave the car is two blocks from the repair shop)

I'm from Spain and talked to my mechanic there and he told me that was almost impossible.

My hypothesis is that the cap was not correctly locked and opened progressively. The mechanic who inspected the car after the overheating said that the cap was in good condition
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Tuesday, February 12th, 2019 AT 6:00 PM (Merged)
Tiny
MHPAUTOS
  • EXPERT
Yes that is my thoughts as well, but you will have a problem proving the point, I don't think I can offer any more advice than give it a try, but don't be disappointed if you hit the wall with this one.

Mark (mhpautos)
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Tuesday, February 12th, 2019 AT 6:00 PM (Merged)

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