Heating issues (Page 3/4)
Monkeybean007 JUN 04, 03:12 PM

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Originally posted by cvxjet:

Patrick- That is what I thought.....But my 1972 Merc Comet had AC and had a VALVE that shut off flow thru the vent system while in AC mode.....Wasn't sure about Fieros.

Is there a (Crazy) possibility that the radiator fan is not running until he turns on the AC? How quickly does it overheat? And at what atmospheric temps?



Nah my radiator fan runs almost consistently all the time except for upon cold start but turns on relatively quick and a couple seconds meaning like 15 - 30 sec my bad, as Patrick is aware I'm bad at explaining things lol
Mike in Sydney JUN 04, 07:47 PM

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Originally posted by Monkeybean007:


...my radiator fan runs almost consistently all the time except for upon cold start but turns on relatively quick and a couple seconds meaning like 15 - 30 sec my bad...l



Something is not making sense. Are you sure the fan is running? In a previous post you said it heats up at stop and go but you're also saying the fan runs almost continuously so that would tend to rule out an fan issue. Good T'stat? How bout the water pump? Impellers can slip if they are plastic.

Some may disagree, but if you remove the t'stat does the car overheat?


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Mike in Sydney

Monkeybean007 JUN 05, 10:50 PM

quote
Originally posted by Mike in Sydney:


Something is not making sense. Are you sure the fan is running? In a previous post you said it heats up at stop and go but you're also saying the fan runs almost continuously so that would tend to rule out an fan issue. Good T'stat? How bout the water pump? Impellers can slip if they are plastic.

Some may disagree, but if you remove the t'stat does the car overheat?




The fan is definitely running can hear it loud and clear, and it does heat up at stop and go especially if I am at a drivethru then it will start to heat up moderately fast. And it's a new thermostat, didn't have one when I got the car so it was always cold, and then found out I didn't have one tossed it in and it let the engine heat up lol. The water pump is what I am thinking due to , squealing upon startup that definitely isn't alternator.
Mike in Sydney JUN 06, 04:02 AM

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Originally posted by Monkeybean007:


....And it's a new thermostat, didn't have one when I got the car so it was always cold, and then found out I didn't have one tossed it in and it let the engine heat up lol. The water pump is what I am thinking due to , squealing upon startup that definitely isn't alternator.



So the problem started after adding a t'stat? Maybe the new thermostat is faulty. Squealing on start-up is usually a loose belt. The belt drives the alternator, water pump and a/c compressor (if you have a/c). Not sure if a loose belt is the problem, but you should check the tension or maybe even replace the belt.

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Mike in Sydney

Monkeybean007 JUN 06, 02:12 PM
[QUOTE]Originally posted by Mike in Sydney:


So the problem started after adding a t'stat? Maybe the new thermostat is faulty. Squealing on start-up is usually a loose belt. The belt drives the alternator, water pump and a/c compressor (if you have a/c). Not sure if a loose belt is the problem, but you should check the tension or maybe even replace the belt.

[/QU

How tight should the belt be ? Right now I have it where you can pluck it like a guitar string but you can still twist it, is that too loose? And it wasn't an issue for a little bit after replacing the thermostat , like month maybe till it became an issue.
88Fingers JUN 07, 08:14 AM
Hello Monkeybean, does your new thermostat have the tall upper loop? The cap presses on the loop to hold the 'stat in place. A regular type T-stat would come up and possibly block the return line to the rad. You said that with no T-stat the engine stayed cold. Has to be a T-stat issue IMHO.
Mike in Sydney JUN 07, 08:40 AM

quote
Originally posted by 88Fingers:

Hello Monkeybean, does your new thermostat have the tall upper loop? The cap presses on the loop to hold the 'stat in place. A regular type T-stat would come up and possibly block the return line to the rad. You said that with no T-stat the engine stayed cold. Has to be a T-stat issue IMHO.



Excellent comment from 88Fingers. Your thermostat should look like this: https://images.app.goo.gl/NhHSHwQNJ1YFVKxHA If it doesn't have the big loop at the top, it's the wrong one. The loop holds the thermostat in place when the coolant filler cap is on.

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Mike in Sydney

[This message has been edited by Mike in Sydney (edited 06-07-2020).]

wftb JUN 07, 08:55 AM
If your radiator cap is old it may not hold pressure and that leads to overheating too. Also they leak, the leak gets bigger over time and one day you will get to your car and there will be a giant green puddle under the nose.

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86 GT built 2.2 ecotec turbo
rear SLA suspension
QA1 coilovers on tube arms

Patrick JUN 07, 03:50 PM

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Originally posted by wftb:

If your radiator cap is old...



Check to make sure it's a non-vented rad cap as well.

From Ogre's Cave...


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Warning! There is an error in Stant old listings. Which means all catalogs, including some brands catalog, listing Stant parts share the same error. The correct caps for Fiero are Stant part numbers 10230 or 10330 non-vented caps.
Monkeybean007 JUN 07, 05:38 PM
Yes the thermostat has the big loop I made sure to look up correct type when I got the new one, and there is no leakage from radiator cap and dosen't appear to be vented how would I check ?