96 Park Avenue Ultra fluctuating water temps - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Buick When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 06-30-2014, 03:13 PM   #1
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Jun 2014
Posts: 11
Thanks: 0
Thanked 1 Time in 1 Post
VladeSpado is on a distinguished road
Default 96 Park Avenue Ultra fluctuating water temps

My 96 Park Ave. Ultra is fluctuating water temp. It stays roughly around 180, but will rise to around 200 and then drop to around 165...all while driving a constant 50 mph or so. The cycle is roughly a minute or so. I thought it was air in the system, but I have bled it twice now using the bleeder screw on top of the thermostat housing with very small if any result. I also noticed that the fan doesn't come on while I'm bleeding the system, and the temp gets around 215 or so, the gauge arrow almost points straight up. There are no drivability issues but I'd like to address this issue asap. Any help would be greatly appreciated.
VladeSpado is offline   Reply With Quote
Old 06-30-2014, 03:36 PM   #2
Senior Administrator








Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,649
Thanked 1,001 Times in 777 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

Typically, the low speed fans will turn on around 212 and high is 226.


In all three of my vehicles, I use a 180* t-stat in the summer. It keeps the engine/engine bay a tad cooler, winter time, 195.


You can trick your PCM to turn your fans on by disconnecting the coolant temp sensor connector. The PCM will command the fans to turn on LOW. This is a built in safety feature should the PCM not see an engine temp.


On your original issue, it seems as if your cooling system is operating fine. Increase/decrease in the temp gauge is normal. Normally, you don't see this in the winter time.


And I wouldn't trust the temp gauge, they tend to be a few degrees off.
Mike is offline   Reply With Quote
Old 06-30-2014, 03:45 PM   #3
Senior Member
True Car Nut
 
Soft Ride's Avatar
 
Join Date: Jan 2012
Location: BC Canada
Posts: 3,590
Thanked 340 Times in 302 Posts
Soft Ride has much to be proud ofSoft Ride has much to be proud ofSoft Ride has much to be proud ofSoft Ride has much to be proud ofSoft Ride has much to be proud ofSoft Ride has much to be proud ofSoft Ride has much to be proud ofSoft Ride has much to be proud of
Default

When was the last time you changed the coolant or thermostat?
Did u do recent work that may have caused air in system or this fluctuation?
I normally drain & refill the coolant every 2 years.
Is it a 180 or 195 degree thermostat in there?
Using an antifreeze tester, what is the coolant reading -40 or?
My 97 PA has a 195 thermostat and stays around 190-195 on hwy.
The cooling fans dont seem to kick in on mine til about 215 some times as well (idle)
If I engage the AC or defrost mode, the fans should automatically come on and the temp will drop 15-20 degrees in a minute or two.
Any time I see a wild swing like what u are describing, I wonder if the temp sensor is /gauge is working correctly.
Do you have a scanner that can be plugged into OBDII port & read what temp is being reported?

Last edited by Soft Ride; 06-30-2014 at 03:47 PM.
Soft Ride is offline   Reply With Quote
Old 06-30-2014, 09:24 PM   #4
Senior Member

Certified GM nut
 
Tech II's Avatar
 
Join Date: Feb 2014
Location: Worcester, Ma.
Posts: 2,150
Thanked 785 Times in 614 Posts
Tech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond repute
Default

I'm kind of thinking it'* your thermostat......it'* opening too soon....in fact, I am surprised a P0128 is not set....

At idle, in traffic, or low speeds in the summer, temps can easily rise towards 210 or more...now get out on the highway, and natural air flow can make that thermostat drop more than usual, if it is opening too soon.....A normally opening 195 thermostat, would not allow that temp to get to 165F, that'* why I think it'* your thermostat....
Tech II is offline   Reply With Quote
The Following User Says Thank You to Tech II For This Useful Post:
WilliamE (06-30-2014)
Old 07-01-2014, 04:09 PM   #5
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Jun 2014
Posts: 11
Thanks: 0
Thanked 1 Time in 1 Post
VladeSpado is on a distinguished road
Default

Thanks for all the helpful info. I did disconnect the coolant temp sensor connector and the fans came on, along with the check engine light which I'm sure will disappear soon. I'm not sure if I have the 195 or 180 thermostat, but I like the idea of putting the 180 on in the summertime. I'm assuming I have the stock 195 in as I have never changed it. I do not have a scanner, so I guess I could be off on the exact temps. I did change the coolant about a year or so ago when I replaced the lower and upper intake manifold gaskets. I'll repost when I check/replace the thermostat. Again, thanks for all the info... really helped understand much better.
VladeSpado is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Park Avenue Ultra ssesc93 Lounge 4 06-01-2004 06:59 PM
1994 Buick Park Avenue Ultra egladman General GM Chat 13 10-20-2003 11:11 PM
NEED HELP ASAP WITH PARENTS 1992 Park Avenue ULTRA SC'ed OLBlueEyesBonne 1992-1999 8 08-26-2003 08:36 PM
late 90's Park Avenue Ultra vs. 2000 SSEi dbtk2 General GM Chat 2 08-14-2003 02:15 AM
Putting a 1993 Park Avenue Ultra trans in my 1994 SLE??? OLBlueEyesBonne Performance, Brainstorming & Tuning 1 03-27-2003 12:12 PM


Tags
buick, coolant temperature, cooling fan not running, cooling fluid

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 04:15 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.