Hot, hot, hot temp gage

F

fmiller

New member
Joined
Dec 26, 2005
Location
Columbus, OH
TDI
2000 Jetta TDI
Here's something that started a couple of days ago: I can drive maybe 10 miles from a cold start with the car heating up normally, then suddenly the temp gage will spike up to near the redline and high temp indicator flashes. Meanwhile, next to no heat comes out of the heater. Coasting for a while will drop the temp gage back to near normal for a while, but it goes back up again under load. The coolant level is OK, so I'm guessing that I have a waterpump heading south. Anybody else experience a problem like this?
 
T

TonyJetta

Top Post Dawg
Joined
Sep 15, 2005
Location
Tucson, Az
TDI
'15 Jetta TDI SE / '06 Jetta TDI DSG Pkg0 / '96 Passat TDI
I would be thinking more along the lines of a temp sensor, before water pump.

To diagnose it, I'd do a cross check: Using vag-com, check the numerical temp reading, while using an IR gun or a TC against the block or a radiator hose.

HTH

Tony
 
DieselDriver2003

DieselDriver2003

Veteran Member
Joined
Feb 13, 2003
Location
Demarest, NJ
TDI
2006 New Beetle GLS 5spd
If you get no heat from the vents, I would check the pump. Why? If your fan is working, then no liquid is circulating. This may be the reason the temp gauge is going high. I would not recommend highway driving.
 
D

Drivbiwire

Zehntes Jahr der Veteran
Joined
Oct 13, 1998
Location
Boise, Idaho
TDI
2013 Passat TDI, Newmar Ventana 8.3L ISC 3945, 2016 E250 BT, 2000 Jetta TDI
Impeller failed in the water pump.

Replace everything since you are in there, belt, water pump, idler pulleys, tensioner and THE BOLTS that hold the motor up...

DB
 
MOGolf

MOGolf

Top Post Dawg
Joined
Jun 27, 2001
Location
underneath something
TDI
2001 Golf GLS TDI Reflex silver, rough road suspension and steel skid plate, 2004 Passat Variant, Candy White, rough road suspension and geared balanced shaft module, and much, much more. 2016 LR RR HSE TD6, 2019 Jaguar I-PACE
Before assuming fmiller needs to change the bolts that hold the motor up, don't we first have to know what car/engine is involved?

fmiller, What is your TDI? You didn't say and it isn't in your profile.
 
Monkey1

Monkey1

Veteran Member
Joined
Dec 10, 2003
Location
Langley B.C. Canada
TDI
Golf, 03, silver
Replace your thermostate first... most likely stuck shut that is why you dont get any heat. I had the oposite problem mine stuck open and had no heat and no engine temp... replaced the thermostat and everything works well again. only $20 and 10mins to change
 
Bob_Fout

Bob_Fout

Oil Wanker
Joined
Sep 5, 2004
Location
Indiana
TDI
2003 Jetta - Alaska Green (sold) / 2015 GTI 2.0T
Monkey1 said:
Replace your thermostate first... most likely stuck shut that is why you dont get any heat. I had the oposite problem mine stuck open and had no heat and no engine temp... replaced the thermostat and everything works well again. only $20 and 10mins to change
Click to expand...
He has engine temp though, lots of it!! :) But no heat.
 
L

Long_Range

Veteran Member
Joined
Nov 1, 2004
Location
Arthur, IL , USA
TDI
Jetta Sedan GL 2004
Exactly: With the thermostat stuck shut water would still circulate threw the heater core.


Hot engine and no heat in cabin equals no coolant flow. Water pump is what makes coolant flow.
 
D

Drivbiwire

Zehntes Jahr der Veteran
Joined
Oct 13, 1998
Location
Boise, Idaho
TDI
2013 Passat TDI, Newmar Ventana 8.3L ISC 3945, 2016 E250 BT, 2000 Jetta TDI
Failed theromstats cause a loss of heat due to the thermostat failing open thus allowing full flow from the engine to the radiator and preventing the engine from reaching operating temperature. Coolant also continues to flow to the heater core but the temp is low enough that you will not get heat in the car.

Since the engine is overheating under load this indicates that the water pump is failed and not circulating the coolant sufficient to maintain proper engine temperatures and triggering the overheat warning.

To verify water pump operation remove the coolant cap and visually verify coolant returning to the reservoir. If there is no coolant flow to the reservoir DO NOT OPERATE THE CAR!!! Tow it or repair it but DO NOT OPERATE THE CAR!!! If you drive the car with a failed water pump the head will warp and you will damage the engine beyond repair...

DB
 
shaark92

shaark92

Veteran Member
Joined
Dec 29, 2005
Location
Erath County, Texas
TDI
06 Jetta, manual. '12 Jetta, DSG
Sorry for the off topic comment, but drivebi's sig spooked me.

He tagged my desktop ... so I tried the laptop (different OS). tagged it too!

Men in Black ARE watching! "Hi Black-Attired Men"

Back to reg sked programming.

Of course, I won't presume to know the systems of the TDI ... but I do have experience with this sort of thing in my chevy small blocks. Most of the time, it's been a stuck thermostat ... but water pumps DO fail.

I'll second the troubleshooting technique to eliminate the water pump. Might could also pull one side of the heater core's hoses & check for flow there, too. (Assuming the smart elec Germans didn't put a thermostat in that plumbing, too. In that case, it'd matter which hose was pulled.)

The water pump is easy to change on my Chevys (inexpensive, too --- $30 w/ core exchange) Did VW build the car around the water pump like Ford did around the Escorts?

Drivebi also suggested replacing the WP's mounting bolts??? Is that a diesel peculiarity from the characteristically greater vibration vv gassers?

Another great thread!

Keep it up!

Al
 
Bob_Fout

Bob_Fout

Oil Wanker
Joined
Sep 5, 2004
Location
Indiana
TDI
2003 Jetta - Alaska Green (sold) / 2015 GTI 2.0T
shaark92 said:
Sorry for the off topic comment, but drivebi's sig spooked me.

He tagged my desktop ... so I tried the laptop (different OS). tagged it too!

Men in Black ARE watching! "Hi Black-Attired Men"

Back to reg sked programming.

Of course, I won't presume to know the systems of the TDI ... but I do have experience with this sort of thing in my chevy small blocks. Most of the time, it's been a stuck thermostat ... but water pumps DO fail.

I'll second the troubleshooting technique to eliminate the water pump. Might could also pull one side of the heater core's hoses & check for flow there, too. (Assuming the smart elec Germans didn't put a thermostat in that plumbing, too. In that case, it'd matter which hose was pulled.)

The water pump is easy to change on my Chevys (inexpensive, too --- $30 w/ core exchange) Did VW build the car around the water pump like Ford did around the Escorts?

Drivebi also suggested replacing the WP's mounting bolts??? Is that a diesel peculiarity from the characteristically greater vibration vv gassers?

Another great thread!

Keep it up!

Al
Click to expand...
DB's sig is really simple. When you visit a website the remote web server knows your IP address, your browser type, and OS type (among other things like screen resolution) because your web browser sends that information. No one is spying on you.
 
shaark92

shaark92

Veteran Member
Joined
Dec 29, 2005
Location
Erath County, Texas
TDI
06 Jetta, manual. '12 Jetta, DSG
Sorry ... I fergot to add my <TIC>

Didn't intend to suggest DB was snoopin my house or such.

But ... you're not parenoid if they really are out to get ya ... either.
 
W

weedeater

Top Post Dawg
Joined
Mar 17, 2001
Location
Reston, VA
TDI
Jetta, 2001, Baltic Green
The bolts in question that need to be replaced are the engine mount bolts that have to be removed in order to change the belt.

The impeller is a known problem with the water pump. It comes loose from the shaft.
 
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