Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!

Bad Thermostat?

Thread Tools
 
Search this Thread
 
Old 10-21-2001, 02:51 AM
  #1  
Supreme Member

Thread Starter
 
89V6FBIRD's Avatar
 
Join Date: Dec 2000
Location: UCIrvine or SFV, CA
Posts: 1,128
Likes: 0
Received 0 Likes on 0 Posts
Car: 1999 Pontiac Trans Am
Engine: LS1 - 346 ci
Transmission: 4L60E
Bad Thermostat?

This car is not being nice. First the timing thing (which I still haven't figure out) and now there's coolant leaking from the uppper rad hose. The upper hose gets hot and then leaks at the end of the hose where the thermostat housing is. Lower hose stays cold.
Symptoms of a dead thermostat?

------------------
Stock 2.8 MPFI auto w/ Flowmaster 80 Series, More to come......
Pioneer DEH-11
Targa E-910 7-Band Equalizer w/ crossover
2x 10" Pioneer subs powered by 300 Watt Jensen amp
2- 6x9" Pioneer (rear)
More to come..... (hey, i dont got a job yet)
Old 10-21-2001, 02:56 AM
  #2  
Supreme Member

 
rezinn's Avatar
 
Join Date: Dec 2000
Location: California
Posts: 3,813
Likes: 0
Received 2 Likes on 2 Posts
Its really hard to ruin a thermostat, if you suspect it may be bad, consider it bad and replace it. Its a ten minute job that costs five bucks. I would just check to see if the hose is secure though.
Old 10-22-2001, 01:48 PM
  #3  
Junior Member
 
zslug's Avatar
 
Join Date: Sep 1999
Location: Covington,KY, USA
Posts: 28
Likes: 0
Received 0 Likes on 0 Posts
Unless I'm very confused (which could be) the engine coolant flows from the thermostat, through the upper hose, through the radiator, and back to the engine via the lower rediator hose.
Something's not flowing. I doubt it's the thermostat, but since it's the cheapest and easiest thing to check, pull it out and see if you get flow restored through the system. If so, you just got lucky; get a new thermostat.
If not, head for a radiator shop!



------------------
Zslug

May the road rise to meet your treads...

'84Z, 5sp, stock 305, Edelbrock intake, GTA wheels
Old 10-23-2001, 12:38 AM
  #4  
Supreme Member

Thread Starter
 
89V6FBIRD's Avatar
 
Join Date: Dec 2000
Location: UCIrvine or SFV, CA
Posts: 1,128
Likes: 0
Received 0 Likes on 0 Posts
Car: 1999 Pontiac Trans Am
Engine: LS1 - 346 ci
Transmission: 4L60E
Is it really that order?? I always thought it went from the radiator to the upper hose to the thermostat thru the engine then out the bottom. But then if the top gets hot and the bottom doesnt......?
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Bubbajones_ya
Cooling
24
07-06-2024 08:32 PM
92firebirdguy
TBI
59
09-01-2016 07:53 AM
Stryker412
Cooling
14
09-20-2015 06:59 PM
gta892000
Electronics
1
09-16-2015 12:40 AM
85Special
DIY PROM
1
09-03-2015 04:21 PM



Quick Reply: Bad Thermostat?



All times are GMT -5. The time now is 11:11 PM.