Overheating Blues - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members

General Miata Chat A place to talk about anything Miata

LinkBack Thread Tools
Old 03-03-2007, 03:36 AM   #1
Senior Member
Thread Starter
Join Date: May 2005
Location: San Francisco
Posts: 547
Total Cats: 0
Default Overheating Blues

Car is a 92 1.6 5spd Miata w 315k miles on it.
When it was purchased the clutch needed to be replaced, so figured might as well swap out the motor.
Had a JDM motor installed with all seals, gaskets, and hoses replaced with Mazda parts, fuel filter, engine mounts, clutch, flywheel, all replaced as well.
Replaced thermostat with aftermarket (the shop chose it).
Belly pan is in place, no front plate to block radiator. Car is bone stock less suspension.
Coolant should be 50/50 mix.

Car looses coolant; shop damaged heater core, car overheats. shop replaced heater core and seems to be fine.
Drove car home from shop 30 miles, and the temp stayed rock solid at a tick under 12 o clock.
Two days later the car starts overheating (about 3/4) while on the freeway or on the street. Turning on heater and keeping revs down maintains more normal heat.

Doubt it's the headgasket, no oil in coolant and no coolant in oil, no excessive white smoke when driving.

So we replaced the thermoswitch (coolant temp switch to turn fan on on the radiator), removed thermostat, and replaced radiator cap. New Mazda themostat is on its way from trussville, should get here on monday.
Car still overheats.

What could be causing the problem? Read Miata.net until my eyes started hurting. So now I ask the big boys. What would you try/troubleshoot next?
turbored is offline   Reply With Quote
Old 03-03-2007, 03:49 AM   #2
Senior Member
Join Date: Dec 2005
Posts: 865
Total Cats: 0

are the fans going on?did you flush the radiator, it might be clogged?
turbopezz is offline   Reply With Quote
Old 03-03-2007, 10:50 AM   #3
Senior Member
steelrat's Avatar
Join Date: Jul 2005
Posts: 514
Total Cats: 0

There's a few things I can think of too.... check your rad... make sure it looks to be in good shape.... Fans working? If you jumper the FEN and grd (I think that's it, check the manual for the jumper places)... do the fans come on with the ignition?

Check the coolant for air pockets. Maybe they didn't "burp" the system properly.

Have you checked if the motor "feels" hotter than usual? maybe the wiring for the gauge got damaged when the dash got ripped appart?

Also, when does the temp gauge go up? Right after getting on the highway? Stop and go? Can you describe when it happens?

steelrat is offline   Reply With Quote
Old 03-03-2007, 12:55 PM   #4
Junior Member
iTrader: (1)
Join Date: Oct 2004
Location: Haarlem ,the Netherlands
Posts: 453
Total Cats: 0

Ever replaced your radiator cap?

The radiator cap can be old, it will not hold pressure so the coolent gets hotter....
greddymx5 is offline   Reply With Quote
Old 03-03-2007, 01:50 PM   #5
Senior Member
boostinsteve's Avatar
Join Date: Oct 2006
Location: Honolulu, HI
Posts: 563
Total Cats: 0

Mine had this problam because of where the PO had the license plate.
boostinsteve is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
1994 Spec Miata Race Car SM/SM2/SSM For Sale Quinn Cars for sale/trade 6 10-23-2016 08:58 AM
Noob to Miataturbo from MA JxPhan Meet and Greet 3 10-02-2015 03:17 AM
96 montego blue nOOb from Milwaukee Squiblez Meet and Greet 1 09-23-2015 02:50 AM
New here, saying hi, here's what I'm workin with. SuperSneakySecretSquirrel Meet and Greet 5 09-06-2015 09:30 PM
Overheating Turbo'd 96M Bruce MacKay General Miata Chat 8 09-05-2015 08:05 PM

Thread Tools

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 07:09 PM.