VWDieselParts.com

omegakates · Glow Plug Joined: 24 Sep 2007 Posts: 3

I have a diesel vanagon with a brand new 1.9 TD engine. I'm having a problem with the van overheating at highway speeds. It runs just a needle width above normal around town, but on the highway it runs about 3/4 of the guage (210 deg to 230 deg). I've installed a new radiator and thermostat. What could be causing this?

libbybapa · Turbo Charger Joined: 17 Nov 2005 Posts: 2356

Air in the system or a bad waterpump are a couple of scenarios.

Andrew

stopping · Posted: Sat Oct 06, 2007 12:48 am Post subject:

I have the same thing... I wonder if it isn't oil temp? Take a look at Bullisurfers... helps if you speak german.. my google link auto translates most of it.

http://www.bullisurfers.com/

look for their oil cooler thread. I dont know how important this would be compared to the expense of it... but if you figure it out please let me know.

What are highway speeds for you?..... 120kmph/70 erso mph?

You have checked for the things Andrew mentioned? How about a minute head gasket leak?

stv
_________________
Steve

http://turbodieselvanagon.blogspot.com/

Vanagon 1.9td

omegakates · Glow Plug Joined: 24 Sep 2007 Posts: 3

I removed the water pump this week. It looks ok, no leaks and the impeller seems fine. As far as air in the system, I don't see any bubbles in the coolant when I bleed it, so I'm assuming that's okay.

As far as oil temp goes, I have read things about the oil cooler actually making the coolant hotter. I've always suspected that it's the oil temp raising my coolant temp, but don't know how to cure that. Would running full synthetic help?

libbybapa · Turbo Charger Joined: 17 Nov 2005 Posts: 2356

What method of bleeding are you using? You need to get all of the air out of the radiator which is ABOVE the coolant filling tank.

Andrew

stopping · Posted: Sat Oct 06, 2007 1:15 pm Post subject:

Yes the air in the rad reduces your van's cooling capacity by 1/3 to 1/2 if it has air in it.

Andrew how about your secret weapon! I am surprised you haven't post a picture of here......

Andrew Libby invented a great tool that costs $15 and works flawlessly for filling the van's cooling system. I made one and it work perfectly.

http://www.thesamba.com/vw/forum/viewtopic.php?t=234192&highlight=bleeding+stress
I hope you don't mind I make the link......
_________________
Steve

http://turbodieselvanagon.blogspot.com/

Vanagon 1.9td

libbybapa · Turbo Charger Joined: 17 Nov 2005 Posts: 2356

By all means post the link anywhere you like. I was just lazy enough to not go searching. Embarassed

Not only does the air a pocket of air in the radiator reduce the cooling capacity of the radiator, it also MASSIVELY reduces the function of the waterpump by making it do only PUSH rather than the cooperative PUSH-PULL of a properly bled system.

Andrew

VanagonExpress · Guest

I just did 6300 miles from the west coast to the florida back up into Kansas west thru Highway 40 back to Monterey in my Vanagon diesel---12 days

averaged 500 miles a day. The swampland in LA was nasty. I miss AC.

I run 160 thermostat in mine. With 180/185 thermo switch in the radiator

Also |I have manual over ride, the pull up into Flagstaff and back towing a small trailer works the hell out of the engine

Needle NEVER went beyond the middle...even with my foot into it, and towing

I am a fan of cooler running motors....maybe at 160,000 on the engine with only one headgasket at 22,000 the cooler running engine seems to be working for us

I see 210 at the head outlet on a hard pull, and usually 190 normally at highway speeds.

stopping · Posted: Sun Oct 07, 2007 6:26 pm Post subject:

Was that a 1.9td your driving? These AAZ's can make a lot of heat eh?
_________________
Steve

http://turbodieselvanagon.blogspot.com/

Vanagon 1.9td

stopping · Posted: Mon Aug 11, 2008 7:07 am Post subject:

Do you figure it out? Was it bleeding or water pump or oil temp or timing?
_________________
Steve

http://turbodieselvanagon.blogspot.com/

Vanagon 1.9td

CoolAirVw · Posted: Mon Aug 11, 2008 7:39 pm Post subject:

So you shoot a potato into it????
_________________
Richard
85 Jetta TD
ASE Certified Master Auto-Technician with L1 Advanced Engine Diagnostic Rating
ATRA Certified in Rebuilding, Diagnosing & Installing Transmissions

My Threads---> Rusty Floor Repair ---- Oil Pressure Warning----Uploading Pictures----My Porsche 914

libbybapa · Turbo Charger Joined: 17 Nov 2005 Posts: 2356

I keep it under the rear seat for a conversation piece in case my vehicle ever gets searched. Shocked

Andrew

Josh · Posted: Tue Oct 28, 2008 11:34 am Post subject:

an update would be appreciated; I just ordered a new old stock longblock AAZ from nevada for potential van installation come springtime!

Nevermind, that shady reputed group dis-allowed the purchase because they didn't like the auction's ending amount. Their response? "it was an error".

So they accidentally listed several dozen engines individually, with different ending times; yeah, right. Never buy from these peeps. BEWARE!
_________________
-'79 rabbit, getting parted out
-'82 quantum wagon, gutting.
-'84 rehabbed quantum TD sedan, southern rustless beauty for sale
-'82 cherry Westy from AZ
-more all the time; are they breeding?

vixentd · Posted: Fri Oct 31, 2008 1:26 am Post subject: overheating

Several years ago replaced the 1.9aaz with a brand new aaz with the modified crank. Everything new and the motor ran about 15 degrees warmer than the old motor. People said the motor was tight, and that was the problem. Sensors changed, voltage stablizer in the dash, thermostat, even though these parts were all new. No solution found.

4 years later water pump leaks and is replaced. The new waterpump had a flimsly pressed tin blade as opposed the the heavy molded fins on the old one. Tried to exchange but this was the only water pumps they now sold.

Result, motor runs 15 degrees cooler. Friend noticed the same with his aaz as well. Make sure you have the newer style pump on the aaz.
_________________
If it doesn't rattle it isnt a diesel! 35mpg for a motorhome! 106 mph! www.vixenrv.org