Jump to content

Overheating while idling

  • Please log in to reply
6 replies to this topic

#1 bflann



  • Members
  • PipPipPip
  • 280 posts
  • Gender:Male
  • Location:Florida
  • Model:Conquest

Posted 13 April 2019 - 10:54 AM

Coolant temp rises while idling, but goes back down to normal when driving. Is this just leaky head gasket or more serious issue. Not smoking or losing coolant that i can tell, oil is not contaminated. Although I am using the Evan's waterless coolant. Thoughts on what to look for before I tear down, hoping not to have to get machine shop work done. Motor rebuild has 1k, recent dyno 325whp 395 torque Magna MPI 1000ID's Turbonetics T3/T4 @ 24 psi, was shooting for 30 psi but turbo to manifold bolts loosened up, exhaust leak

Edited by bflann, 13 April 2019 - 11:07 AM.

#2 ucw458


    This will mean the extinction of all life forms on this planet.

  • Moderators
  • PipPipPipPipPip
  • 11,687 posts
  • Gender:Male
  • Location:Colorado
  • Model:Conquest

Posted 13 April 2019 - 11:29 AM

Check your fans.  Running hot when idling is lack of air flow.
My 87
Posted Image

#3 speedyquest


    Established Member

  • Members
  • PipPipPip
  • 4,338 posts
  • Gender:Male
  • Location:La Crosse Wisconsin
  • Interests:bmx, cars, computers
  • Model:Starion

Posted 13 April 2019 - 01:49 PM

An inexpensive couple of tests you could do would be both a compression and leakdown test. Along with that you could replace your thermostat for safety. Otherwise like ucw458 said double check that your fans are working correctly AND that they are wired up to move air in the right direction.

Posted Image

#4 croquest87


    Established Member

  • Members
  • PipPipPip
  • 1,767 posts
  • Gender:Male
  • Location:willoughby
  • Interests:all things mechanical
  • Model:Conquest

Posted 13 April 2019 - 07:53 PM

Check your fans and l would make sure system is burped. I run 60% water to 40%coolant large mechanical fan w shroud.Never passed 18O deg on hottest day. Mpi megasquirt t3/t4 turbonetics and all kinds of other gizmos lol

Edited by croquest87, 13 April 2019 - 08:18 PM.

#5 importwarrior


    6 Quests and Counting......

  • Moderators
  • PipPipPipPipPip
  • 18,353 posts
  • Gender:Male
  • Location:Manassas VA
  • Interests:Boost = 2KWIK4U
  • Model:Conquest

Posted 14 April 2019 - 11:42 AM

Besides what was stated above.

even if the fans are spinning, this does not mean they are moving the proper amount of AIR...

if original fans they could be worn out and not able to pull enough air.

B-71 87 TSI ~ RIP

Black 87 Starion ~ Mess SOLD!!!

Proud New 89 slightly Rusted Fiji Owner !!!

#6 psu_Crash


    Advanced Member

  • Members
  • PipPipPipPip
  • 7,291 posts
  • Gender:Male
  • Location:Lawrenceville PA
  • Interests:400+ WHP 450+ WTQ!!... and curves with green eyes
  • Model:Starion

Posted 15 April 2019 - 01:13 PM

View Postbflann, on 13 April 2019 - 10:54 AM, said:

recent dyno 325whp 395 torque Magna MPI 1000ID's Turbonetics T3/T4 @ 24 psi, was shooting for 30 psi but turbo to manifold bolts loosened up, exhaust leak

May the force be with you... you are going to need it.
as things warm up do you see coolant flow? Take off the cap and let it warm up at aprox 180 you should see coolant flow in the radiator. If not your thermostat could be to blame. What fuel are you running?
'86 Starion, MPI with MS2extra, Turbo Lab GTX3071R, P&P head, OS SS Valves, Wiseco +.030, ARP head/rod, RPW Roller Cam, Crower Rods, AEM H2O/Meth Injection, Mighty Max CAS 4 Direct Fire Wasted Spark, BSE, Tial 38mm, JDL exhaust mani, HKS turbo timer and EVC3, AEM UEGO, 3" DP into 2 1/2" Dual Exhaust, 85# Delphi's, Magna modded by Chad, Accufab FPR, Walbro 255, D2 Coilovers, GNT Poly Bushings and mounts, Autopower 4 point cage, Funk-Lock, LED Tails and Dome ... etc^4
2016, 17, 19 SCCA Solo, Glen Region Season Champion in Street Modified
The Valencia Project
http://www.starquest...+golden +dreams
My Feedback Link
Posted Image

#7 Funky Phil

Funky Phil

    Super Pooper

  • Members
  • PipPipPipPip
  • 6,465 posts
  • Gender:Male
  • Location:Missouri
  • Model:Conquest

Posted 16 April 2019 - 08:19 AM

Plugged radiator?
Where are you reading temperature from on the motor?
What temps are you seeing?
What tstat temp?

10.95@120mph  https://m.youtube.co...h?v=8Q01UKt5q4U
Built G54B, S364, R154, stock 6-bolt, fireballs

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users