98 VDP, low engine temp, problems/story
#21
I just replaced the thermostat that came with the Welsh tower which I installed less than three years ago. I noticed the temp was a little low according to the Realgauge mod.
Put my Ultragauge in the car to get a digital readout and saw 175-180 deg. So I replaced the thermostat with a Gates unit and am now running at 190- 195 deg., which I think is correct for this engine.
Put my Ultragauge in the car to get a digital readout and saw 175-180 deg. So I replaced the thermostat with a Gates unit and am now running at 190- 195 deg., which I think is correct for this engine.
the thing is after all this work how does my expansion tank crack, I just feel like something isn't working right in my coolant system, is that made of the same material as the thermostat housing that was original? if so that may be why it cracked (its time to go after 16 years)
#22
"perfidious"
adjective
1.deliberately faithless; treacherous; deceitful:
example: a "perfidious" lover.
I guess you meant "profusely?"
A few more paragraph breaks will get you more reads and responses too.
You are new here, welcome to the friendliest auto forum on the web!
For future posts try to remember that someone has to voluntarily read what you are writing. An endless stream of misspelled words with minimal punctuation and no breaks will usually result in most of us passing on reading your posts.
Vector
#23
"the thing is after all this work how does my expansion tank crack, I just feel like something isn't working right in my coolant system, is that made of the same material as the thermostat housing that was original? if so that may be why it cracked (its time to go after 16 years)"
Probably just coincidence. It's perfectly normal for the thermostat housing and the header tank to fail at the age and mileage of your car. The plastic and rubber cooling system components have a limited life.
They both failed on my 2002 in the last year, so to fail on your 98 is not a surprise.
Sorry to report, but the water pump, and all the hoses probably aren't far behind.
Remember that the cooling system runs at pressure, not sure exactly but about 15 psi above atmosphere. This is to prevent boiling. The boiling temperature at 15 psi is 250F vs. 212 at atmosphere. The system pressure is controlled by the cap on the header tank tank, which opens at 15 psi approx. Unfortunately, all those pressure cycles, every time you drive, take their toll on plastic and rubber components. Imagine them bring inflated to 2 times atmospheric pressure, and back, each drive cycle. Plus, the plastic gets more brittle as it gets older.
Probably just coincidence. It's perfectly normal for the thermostat housing and the header tank to fail at the age and mileage of your car. The plastic and rubber cooling system components have a limited life.
They both failed on my 2002 in the last year, so to fail on your 98 is not a surprise.
Sorry to report, but the water pump, and all the hoses probably aren't far behind.
Remember that the cooling system runs at pressure, not sure exactly but about 15 psi above atmosphere. This is to prevent boiling. The boiling temperature at 15 psi is 250F vs. 212 at atmosphere. The system pressure is controlled by the cap on the header tank tank, which opens at 15 psi approx. Unfortunately, all those pressure cycles, every time you drive, take their toll on plastic and rubber components. Imagine them bring inflated to 2 times atmospheric pressure, and back, each drive cycle. Plus, the plastic gets more brittle as it gets older.
Last edited by Mark SF; 01-04-2015 at 08:36 PM.
#24
I had to look this one up:
"perfidious"
adjective
1.deliberately faithless; treacherous; deceitful:
example: a "perfidious" lover.
I guess you meant "profusely?"
A few more paragraph breaks will get you more reads and responses too.
You are new here, welcome to the friendliest auto forum on the web!
For future posts try to remember that someone has to voluntarily read what you are writing. An endless stream of misspelled words with minimal punctuation and no breaks will usually result in most of us passing on reading your posts.
Vector
"perfidious"
adjective
1.deliberately faithless; treacherous; deceitful:
example: a "perfidious" lover.
I guess you meant "profusely?"
A few more paragraph breaks will get you more reads and responses too.
You are new here, welcome to the friendliest auto forum on the web!
For future posts try to remember that someone has to voluntarily read what you are writing. An endless stream of misspelled words with minimal punctuation and no breaks will usually result in most of us passing on reading your posts.
Vector
#25
https://www.jaguarforums.com/forum/n...gned-up-22253/
Item 6 from "Tips for Successful Threads:"
"Please DON'T write your posts with long unbroken lines of texts that go on & on. There'a almost nothing worse & makes the whole post unreadable. Please DO be sure to create line breaks and space out your text, this will ensure members read and hopefully reply, helping you with your issues."
Vector
#27
Soooooooooo, you have been warned before, eh? lol.
Really, lately we are having a rash of these types of posts because it is an accepted way to write short text messages.
But when you write something long, with a lot of info, the lack of punctuation and paragraphs makes it hard to read.
Because posts like this are difficult to read, many members will pass them by and you will not get good answers to your questions.
Your high school teacher was right and this is why - readability. Think of me as your "adult life" English teacher.
This forum is notoriously friendly, especially to newcomers. For that reason we try to read and respond to all posts.
On another, non-car forum I frequent, the members will respond to a run on post with a simple "I am not reading your unreadable post." Other forums have self appointed "grammar" and "punctuation" police too, I don't want to go there. As long as a post is readable we are all OK with it here.
Vector
Really, lately we are having a rash of these types of posts because it is an accepted way to write short text messages.
But when you write something long, with a lot of info, the lack of punctuation and paragraphs makes it hard to read.
Because posts like this are difficult to read, many members will pass them by and you will not get good answers to your questions.
Your high school teacher was right and this is why - readability. Think of me as your "adult life" English teacher.
This forum is notoriously friendly, especially to newcomers. For that reason we try to read and respond to all posts.
On another, non-car forum I frequent, the members will respond to a run on post with a simple "I am not reading your unreadable post." Other forums have self appointed "grammar" and "punctuation" police too, I don't want to go there. As long as a post is readable we are all OK with it here.
Vector
#28
Roger profusely perfidious (and iPad and Siri ^^^^ing up great prose -- been there). And need for short concise paragraphs.
Gabe: did it get fixed? Have you changed out the header tank (it is the header tank that is leaking, ne?)? Going to be real difficult to hold pressure with a busted tank. You have confirmed the correct routing of the overflow tubes? Is the 'Italian' tech a keeper?
Where are you with this problem?
Gabe: did it get fixed? Have you changed out the header tank (it is the header tank that is leaking, ne?)? Going to be real difficult to hold pressure with a busted tank. You have confirmed the correct routing of the overflow tubes? Is the 'Italian' tech a keeper?
Where are you with this problem?
#29
"the thing is after all this work how does my expansion tank crack, I just feel like something isn't working right in my coolant system, is that made of the same material as the thermostat housing that was original? if so that may be why it cracked (its time to go after 16 years)"
Probably just coincidence. It's perfectly normal for the thermostat housing and the header tank to fail at the age and mileage of your car. The plastic and rubber cooling system components have a limited life.
They both failed on my 2002 in the last year, so to fail on your 98 is not a surprise.
Sorry to report, but the water pump, and all the hoses probably aren't far behind.
Remember that the cooling system runs at pressure, not sure exactly but about 15 psi above atmosphere. This is to prevent boiling. The boiling temperature at 15 psi is 250F vs. 212 at atmosphere. The system pressure is controlled by the cap on the header tank tank, which opens at 15 psi approx. Unfortunately, all those pressure cycles, every time you drive, take their toll on plastic and rubber components. Imagine them bring inflated to 2 times atmospheric pressure, and back, each drive cycle. Plus, the plastic gets more brittle as it gets older.
Probably just coincidence. It's perfectly normal for the thermostat housing and the header tank to fail at the age and mileage of your car. The plastic and rubber cooling system components have a limited life.
They both failed on my 2002 in the last year, so to fail on your 98 is not a surprise.
Sorry to report, but the water pump, and all the hoses probably aren't far behind.
Remember that the cooling system runs at pressure, not sure exactly but about 15 psi above atmosphere. This is to prevent boiling. The boiling temperature at 15 psi is 250F vs. 212 at atmosphere. The system pressure is controlled by the cap on the header tank tank, which opens at 15 psi approx. Unfortunately, all those pressure cycles, every time you drive, take their toll on plastic and rubber components. Imagine them bring inflated to 2 times atmospheric pressure, and back, each drive cycle. Plus, the plastic gets more brittle as it gets older.
#30
Roger profusely perfidious (and iPad and Siri ^^^^ing up great prose -- been there). And need for short concise paragraphs.
Gabe: did it get fixed? Have you changed out the header tank (it is the header tank that is leaking, ne?)? Going to be real difficult to hold pressure with a busted tank. You have confirmed the correct routing of the overflow tubes? Is the 'Italian' tech a keeper?
Where are you with this problem?
Gabe: did it get fixed? Have you changed out the header tank (it is the header tank that is leaking, ne?)? Going to be real difficult to hold pressure with a busted tank. You have confirmed the correct routing of the overflow tubes? Is the 'Italian' tech a keeper?
Where are you with this problem?
#31
The following users liked this post:
Jhartz (01-05-2015)
#32
#34
#35
Well new thermostat did not fix it, bought an OEM from jag, got it today and will be finished tomorrow, shop owner said he can get to car temp by blocking hoses (what thermostat does) he said the welsh thermostat is opening to early, I called welsh and the guy tried to tell me I was wrong, when and if this OEM thermostat fixes it I will be calling welsh for my refund
#36
#37
#38
#40
If I were back in a chemistry lab with a digital thermometer and heating system with more control than my stove, I could probably make more accurate observations. But even there, a small change in the opening results in a large change in the flow rate, so it's hard to quantify.