Why would a car run cool?
Discussion
Thermostat? Replaced it with a higher temp one, no change at all
Gauge- well it seems to agree with the otter switch, it says 92 just as the fans kick in on the 92 otter switch so I reckon its right
Everything was fine until I took out the rad for repairs and since then it runs at about 75, whereas before it was sitting nicely at 85-90
It will get hot enought for the fans, but only if sitting still.
What else could this be, some sort of bizzare air lock??
Gauge- well it seems to agree with the otter switch, it says 92 just as the fans kick in on the 92 otter switch so I reckon its right
Everything was fine until I took out the rad for repairs and since then it runs at about 75, whereas before it was sitting nicely at 85-90
It will get hot enought for the fans, but only if sitting still.
What else could this be, some sort of bizzare air lock??
Your repairs were more effective than you thought?
Thermostat not seating in its housing properly? Or some unpleasant casting porosity having the same effect? Plumbing error that could do it? (pretty unlikely)
You put a diesel engine in at the same time and didn't notice?
If you wanna run cool, you got to run on diesel fuel.
Thermostat not seating in its housing properly? Or some unpleasant casting porosity having the same effect? Plumbing error that could do it? (pretty unlikely)
You put a diesel engine in at the same time and didn't notice?
If you wanna run cool, you got to run on diesel fuel. stigproducts said:
Surely, irrespective of the effcientcy of the radiator, the thermostat would keep the engine at a consistent temperature? This is what I don't get.
Removing the rad was to fix a leak because it was poorly manufactured, that was all.
Removing the rad was to fix a leak because it was poorly manufactured, that was all.
Stat is only there to bypass the rad when cold, it reaches temp and opens all the way. It doesn't regulate flow or anything like that.
What temperature do you think it should be running at? The gauge can't be relied on for accuracy unless you've calibrated it. If it's only reading 5-10 degrees cooler than you expect, I'd suspect the gauge is reading low and the engine was actually running too hot before.
There are really only two things that can make an engine run cool. Either water is flowing through the rad, or you have a severely cold air blast through the engine bay. Air blast cooling isn't going to matter unless you are crossing the arctic. The only way for water to get into the rad is to come past the stat. When the engine is only working gently in very cold weather, it only takes a tiny trickle of water through the radiator to cool it. Just a stat that fails to seat properly or has too many bleed holes drilled through it can be enough. But that's less likely to be the problem if it also happens in warmer weather and when the engine is working harder.
There are really only two things that can make an engine run cool. Either water is flowing through the rad, or you have a severely cold air blast through the engine bay. Air blast cooling isn't going to matter unless you are crossing the arctic. The only way for water to get into the rad is to come past the stat. When the engine is only working gently in very cold weather, it only takes a tiny trickle of water through the radiator to cool it. Just a stat that fails to seat properly or has too many bleed holes drilled through it can be enough. But that's less likely to be the problem if it also happens in warmer weather and when the engine is working harder.
stigproducts said:
the 2 stats were different temperatures but it has made no difference. The stat is 88 so it should be about that temop, not 75 degrees (approx)
Maybe it is the colder weather??
Maybe it is the colder weather??
Stig the numerical value on your gauge is largly meaningless, they are not calibrated so 88 actual degrees could possibly be an indicated 75. If your previous stat was, say 92 you might see 86 or something on the gauge
...also they don't bang open sharply at a precise temperature. For example, I have an 82 degree stat, with 82 written on it. The book of words (which is unusually comprehensive, being a Volvo item) describes the stat as "82 degrees - begins to open at 65, fully open at 82". Warming the engine up with a thermometer dipped in the rad confirms this.
if thats an ESSEX V6 i would be happy with it running at 75 or just over 80 is better,dont use an 88 stat the rear 2 cylinders run too hot as it is(poor water pump placment),you can adjust the temp to your needs,the dimensions of your stat are really common for a stat,i used a NISSAN stats when i ran these engines years back,(dearer)but more reliable & consistant and dont stick shut ever.get your gauge checked out.
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