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#1
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Cold engine at 70Mph
Hi all,
I was driving my 91 Honda Accord on the interstate the other day when it was near freezing outside. I noticed that the engine temperature was near 'C', even after driving at 70Mph for more than 15min! I had to turn the heat all the way up to get a comfortable temperature inside the car. Once I exited the highway and slowed down, the engine temperature began to rise toward half-way between 'C' and 'H', where it usually is. Is the above normal? Is the radiator over-cooling the engine? I am assuming that a cold engine 70Mph is not good for the car. Thanks for any advice. Fijoy |
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#2
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Cold engine at 70Mph
On 12/9/10 2:18 PM, Fijoy wrote:
> Hi all, > > I was driving my 91 Honda Accord on the interstate the other day when > it was near freezing outside. I noticed that the engine temperature > was near 'C', even after driving at 70Mph for more than 15min! I had > to turn the heat all the way up to get a comfortable temperature > inside the car. Once I exited the highway and slowed down, the engine > temperature began to rise toward half-way between 'C' and 'H', where > it usually is. > > Is the above normal? Is the radiator over-cooling the engine? I am > assuming that a cold engine 70Mph is not good for the car. > > Thanks for any advice. > > Fijoy The thermostat is probably stuck open. |
#3
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Cold engine at 70Mph
On 12/09/2010 01:18 PM, Fijoy wrote:
> Hi all, > > I was driving my 91 Honda Accord on the interstate the other day when > it was near freezing outside. I noticed that the engine temperature > was near 'C', even after driving at 70Mph for more than 15min! I had > to turn the heat all the way up to get a comfortable temperature > inside the car. Once I exited the highway and slowed down, the engine > temperature began to rise toward half-way between 'C' and 'H', where > it usually is. > > Is the above normal? Is the radiator over-cooling the engine? I am > assuming that a cold engine 70Mph is not good for the car. > > Thanks for any advice. > > Fijoy 1. it's going to take longer to warm up if the heater is on. in cold weather, a lot longer. 2. at high rpm's, and thus high coolant flow pressure, it's possible for the thermostat valve to be sprung open - the effect would be the same as having the heater on - it'll take longer to warm up. 3. the thermostat might be defective and jammed open. [i've also seen them with debris/foreign matter jammed inside, again preventing them from closing properly.] if this is still the original nearly 20-yo thermostat, i'd recommend changing it. -- nomina rutrum rutrum |
#4
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Cold engine at 70Mph
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#5
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Cold engine at 70Mph
On Dec 9, 4:18*pm, Fijoy > wrote:
> Hi all, > > I was driving my 91 Honda Accord on the interstate the other day when > it was near freezing outside. I noticed that the engine temperature > was near 'C', even after driving at 70Mph for more than 15min! I had > to turn the heat all the way up to get a comfortable temperature > inside the car. Once I exited the highway and slowed down, the engine > temperature began to rise toward half-way between 'C' and 'H', where > it usually is. > > Is the above normal? Is the radiator over-cooling the engine? I am > assuming that a cold engine 70Mph is not good for the car. > > Thanks for any advice. > > Fijoy Hi all, Thanks for the responses. I am thinking of changing the thermostat myself, but I am a novice. I cannot not figure out where the thermostat is, even after a google search. Is it on the lower radiator hose, or the upper one? Do I absolutely have to drain the cooling system to change it? Fijoy |
#6
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Cold engine at 70Mph
On 12/11/10 4:49 PM, Fijoy wrote:
> On Dec 9, 4:18 pm, > wrote: >> Hi all, >> >> I was driving my 91 Honda Accord on the interstate the other day when >> it was near freezing outside. I noticed that the engine temperature >> was near 'C', even after driving at 70Mph for more than 15min! I had >> to turn the heat all the way up to get a comfortable temperature >> inside the car. Once I exited the highway and slowed down, the engine >> temperature began to rise toward half-way between 'C' and 'H', where >> it usually is. >> >> Is the above normal? Is the radiator over-cooling the engine? I am >> assuming that a cold engine 70Mph is not good for the car. >> >> Thanks for any advice. >> >> Fijoy > > Hi all, > > Thanks for the responses. > > I am thinking of changing the thermostat myself, but I am a novice. I > cannot not figure out where the thermostat is, even after a google > search. Is it on the lower radiator hose, or the upper one? Do I > absolutely have to drain the cooling system to change it? > > Fijoy Your willingness and sense of adventure are admirable--- but it sounds like you're over your head on this one. Take it to a repair shop... |
#7
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Cold engine at 70Mph
Thus spake Tegger > :
>Fijoy > wrote in news:a5f058bf-3858-4c56-88c1- : > >> Hi all, >> >> I was driving my 91 Honda Accord on the interstate the other day when >> it was near freezing outside. I noticed that the engine temperature >> was near 'C', even after driving at 70Mph for more than 15min! I had >> to turn the heat all the way up to get a comfortable temperature >> inside the car. Once I exited the highway and slowed down, the engine >> temperature began to rise toward half-way between 'C' and 'H', where >> it usually is. >> >> Is the above normal? Is the radiator over-cooling the engine? I am >> assuming that a cold engine 70Mph is not good for the car. >> > > > >The /thermostat/ is overcooling the engine. You need to replace it. > >Use a genuine Honda thermostat ONLY. It's about $30, but well-worth the >money. Yes, my thought, also. Once you get the antifreeze out, swapping out the 'stat is easy. Purging the coolant is a pain, at least for me. -- - dillon I am not invalid An object's desireability to a dog is directly proportional to its desireability to another dog. |
#8
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Cold engine at 70Mph
It helps to open the bleeder.
On 12/12/2010 10:13 AM, Dillon Pyron wrote: > > Once you get the antifreeze out, swapping out the 'stat is easy. > Purging the coolant is a pain, at least for me. |
#9
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Cold engine at 70Mph
Thus spake dan > :
>It helps to open the bleeder. Oh sure. Some people want the quick and easy way out. When I was a kid we had to combine hydrogen molecules with free oxygen radicals before we could fill our stone radiators. :-) >On 12/12/2010 10:13 AM, Dillon Pyron wrote: > >> >> Once you get the antifreeze out, swapping out the 'stat is easy. >> Purging the coolant is a pain, at least for me. -- - dillon I am not invalid An object's desireability to a dog is directly proportional to its desireability to another dog. |
#10
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Cold engine at 70Mph
Thus spake Fijoy > :
>On Dec 9, 4:18*pm, Fijoy > wrote: >> Hi all, >> >> I was driving my 91 Honda Accord on the interstate the other day when >> it was near freezing outside. I noticed that the engine temperature >> was near 'C', even after driving at 70Mph for more than 15min! I had >> to turn the heat all the way up to get a comfortable temperature >> inside the car. Once I exited the highway and slowed down, the engine >> temperature began to rise toward half-way between 'C' and 'H', where >> it usually is. >> >> Is the above normal? Is the radiator over-cooling the engine? I am >> assuming that a cold engine 70Mph is not good for the car. >> >> Thanks for any advice. >> >> Fijoy > >Hi all, > >Thanks for the responses. > >I am thinking of changing the thermostat myself, but I am a novice. I >cannot not figure out where the thermostat is, even after a google >search. Is it on the lower radiator hose, or the upper one? Do I >absolutely have to drain the cooling system to change it? > >Fijoy The shop manual is your friend. Heck, even Chilton's should get you through that. I wouldn't advocate trying to rebuild your auto trans using one, but changint the 'stat should be doable. Heck, my Honda Fit manual (official) makes it sound easy enough to do at home. "Using a chassis lift, raise the vehicle at least three feet. Disconnect all electrical and fluid lines, remove the hood and, using an appropriate hoist, lower the enginetransaxle assembly after first removing the cross member and the tie rods. Then find someone who knows what the heck they're doing to swear at you for at least ten minutes and call you an idiot in four or more languages, including Japanese" Come one, I just had to. If you read the comic strip "Pearls Before Swine" you can appreciate the long windup. -- - dillon I am not invalid An object's desireability to a dog is directly proportional to its desireability to another dog. |
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