Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Reply
 
LinkBack Thread Tools Display Modes
Old 11-29-2016, 06:48 AM   #1
Registered User
 
Join Date: Oct 2015
Location: Quebec Canada
Posts: 20
Thermostat or Thermostat and Water Pump

My coolant temp light to the right of the temp gauge is always flashing even with a cold start.
The temp gauge stays on 0 for 10 - 15 minutes and then jumps to the max.
The heater provides absolutely no heat

I would appreciate comments.
Thanks
1stSP is offline   Reply With Quote
Old 11-29-2016, 07:32 AM   #2
There Is No Substitute.
 
rick3000's Avatar
 
Join Date: May 2007
Location: West Coast
Posts: 3,106
Garage
Have you checked your coolant level?
Sounds like it could be a bad coolant temperature sensor or a connection issue.

From another thread:
Quote:
Four functions of the coolant warning light:
1. Engine coolant level too low
light flashes slowly (0.5 Hz)
2. Engine compartment temperature too high
light flashes slowly (0.5 Hz) (engine compartment blower might be faulty)
3. Engine coolant temperature too high
light is lit; pointer on the right
4. Temperature sensor at water outlet faulty
light flashes rapidly (1 Hz); pointer on the right
Note
The temperature warning in point three is indicated if the conditions "engine coolant temperature too high" and "engine coolant level too low" are present simultaneously
(1Hz = 1 flash per second. 0.5Hz = 2 seconds per flash)
__________________
1999 Ocean Blue Metallic Boxster - blueboxster.com
rick3000 is offline   Reply With Quote
Old 11-30-2016, 04:55 AM   #3
Registered User
 
mikesz's Avatar
 
Join Date: Feb 2013
Location: Cranston RI
Posts: 853
Garage
as mentioned above there is a sensor on top of the engine passenger side. I replaced mine cost about $35, also there is the passenger side engine vent fan behind the vent, mine was binding I got a used one for about $50. Could just be low coolant level, I have found just a slight decrease sets it off.
__________________
99 Porsche Boxster
mikesz is offline   Reply With Quote
Old 11-30-2016, 07:58 AM   #4
Registered User
 
911monty's Avatar
 
Join Date: Oct 2014
Location: California Central Coast
Posts: 1,268
Garage
+1 on the coolant level. The temp gauge does not work in steam or air, needs to be in water. Coincidentally the heater core will also not put out any heat without water circulating. Be sure to use the proper coolant and purge the system if it is low.
911monty is offline   Reply With Quote
Old 11-30-2016, 08:14 AM   #5
Registered User
 
Join Date: May 2014
Location: S.California
Posts: 2,011
Maybe 'burp' the cooling system ?
Gelbster is offline   Reply With Quote
Old 12-01-2016, 05:23 AM   #6
Registered User
 
Join Date: Oct 2015
Location: Quebec Canada
Posts: 20
The coolant level is good and the reservoir is overflowing, so it is over heating.
1stSP is offline   Reply With Quote
Old 12-01-2016, 05:43 AM   #7
Registered User
 
mikesz's Avatar
 
Join Date: Feb 2013
Location: Cranston RI
Posts: 853
Garage
I would try to burp the system and while the car is running blast the heat. Could be your thermostat. Mine was not working. I replaced it with a low temp one and new water pump and worked fine after.
__________________
99 Porsche Boxster
mikesz is offline   Reply With Quote
Old 12-01-2016, 10:18 AM   #8
Registered User
 
911monty's Avatar
 
Join Date: Oct 2014
Location: California Central Coast
Posts: 1,268
Garage
http://986forum.com/forums/uploads01/Box+Coolant+Schematic1432596358.jpg

Please have a look at the attached cooling system diagram. The cabin heater always has coolant circulating even with the thermostat closed. If the problem was a bad thermostat you would have extreme heat output. So since you have no heat you either have no coolant circulating or your climate control system could be malfunctioning. The common denominator to your symptoms appears that you have an airlocked system or a water pump with no impeller or accessory belt is missing. You might check the belt is still there and if it is I still recommend you to purge the system. The tank can be full but will boil over when the engine overheats. If you can get an Airlift great otherwise Pedro has a procedure you can use on his DIY site.

Please also note there is no temp control valve to the heater. Heater always has full coolant flow. Increasing cabin heat simply redirects more heated air to the cabin.

Last edited by 911monty; 12-01-2016 at 10:45 AM.
911monty is offline   Reply With Quote
Old 12-02-2016, 06:50 AM   #9
Registered User
 
Join Date: Oct 2015
Location: Quebec Canada
Posts: 20
Thank you.
1stSP is offline   Reply With Quote
Reply


Thread Tools
Display Modes

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 09:18 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page