Hi Can anyone recommend a good quality thermostat for my 87 gt - As mine would appear to be stuck open and not allowing the car to warm up unless it is stood in traffic for a while.

Many thanks in advance

Jon

I would stick with brand name (not sure what you have available over there). Stant brand is fine. Have you check to see if you have a thermostat in there? Go with 195F.

[This message has been edited by jaskispyder (edited 10-11-2016).]

Thanks Jaskispyder - yes there is one in there I put it in myself a few years ago but the temp gage has never moved unless stuck in traffic so the car is running rich as proved when I looked at my spark plugs.

jon

This subject is very well documented by the Ogre.

Look under: Powertrain/Cooling/Thermostat

http://fierocave.shorturl.com/

You should check to make sure your temp gauge is working... (each check of the sensor ohms reading)

http://www.fierosails.com/tempgage.html

Have you taken the cap off and confirmed that it is not bent?

quote Originally posted by jon m: Can anyone recommend a good quality thermostat for my 87 gt

Certainly...

quote Originally posted by Patrick in This thread: I believe there are two quality levels of Stant thermostats. Spend a couple extra dollars and get the superior one - Stant SuperStat 45819 (195º)

[This message has been edited by Patrick (edited 10-11-2016).]

Thanks Patrick

quote Originally posted by Domtech: Have you taken the cap off and confirmed that it is not bent?

This could be the problem.
//www.fiero.nl/forum/Forum2/HTML/136030.html

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My World of Wheels Winners (Click on links below)

3.4L Supercharged 87 GT and Super Duty 4 Indy #163

Bent Tstat is very often a problem w/ heater core or plumbing.
Tstat closed then most or all coolant flow is thru the heater loop.
Bad core etc can cause big headaches for most cars but Fiero and a few others can bend Tstat "handle" to release pressure from the Water pump.
Very common to screw up heater plumbing for engine swaps too.
See my Cave, Heater and Thermostat

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave

You Could remove the thermostat and put it in Boiling water on the stove to see if it opens, then pull it out of the water (No, Not with your hand)LOL, and see if it Closes right away. ( should close in a couple of seconds if it's good) I always do that even with a Brand New thermostat. (Just because a part is NEW does not mean it's any good :-) )