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toxicavenger70
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Joined: July 28, 2019
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Location: CO
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 Posted: Tue Jul 28, 2020 8:58 pm Post subject: Re: Thermostat/flaps parts question |
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| bugguy1967 Helped me out with a ton of new parts to rebuild my flaps. I also picked up a recondition thermostat from him. It is more compressed than the thermostat I already have. I will post pics later. |
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sb001
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Location: NW Arkansas
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| Posted: Thu Aug 06, 2020 4:14 pm Post subject: Re: Thermostat/flaps parts question |
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Speaking of which...
is this thermostat toast? (This is after the car was sitting for 3 days.)
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Glenn 
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| Posted: Thu Aug 06, 2020 4:23 pm Post subject: Re: Thermostat/flaps parts question |
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Looks OK to me.
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toxicavenger70
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Joined: July 28, 2019
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Location: CO
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| Posted: Thu Aug 06, 2020 4:36 pm Post subject: Re: Thermostat/flaps parts question |
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| sb001 wrote: |
Speaking of which...
is this thermostat toast? (This is after the car was sitting for 3 days.)
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Looks good. |
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EverettB
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Joined: April 11, 2000
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Location: Phoenix 602
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| Posted: Thu Aug 06, 2020 5:05 pm Post subject: Re: Thermostat/flaps parts question |
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It looks open a little to me but that could be the ambient air temp.
Is that dirt/grease on it? You could clean it up a little or put it in some boiling water and try to scrub it a little.
Maybe there is grease in the crevices preventing it from closing a bit more.
I know you know this but for anyone reading:
Leave it in the bracket so it doesn't over expand in hot water or with a heat gun
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sb001
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Location: NW Arkansas
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| Posted: Thu Aug 06, 2020 5:37 pm Post subject: Re: Thermostat/flaps parts question |
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I mean, yes there is room for it to open a bit until it hits the top of the bracket, but if installed correctly with that point having the flaps fully open, wouldn't that mean it can't really pull the flaps back closed at its most retracted position? (BTW I've had that one stored indoors with the AC on for the last few days, so it's at its most retracted position. I suppose it may have some crud in it though that is keeping it from fully closing.)
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1969 autostick sedan, family owned since new
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sb001
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| Posted: Thu Aug 06, 2020 5:43 pm Post subject: Re: Thermostat/flaps parts question |
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Hmmm-- here's a second thermostat I forgot I had that's WAY more compressed when cold:
Bad camera angle but when looked at dead on this one meets the "5/8 rule" discussed earlier in the thread. The first one clearly does not.
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Bosch 113905205AE autostick distributor |
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Glenn
Mr. 010
Joined: December 25, 2001
Posts: 79633
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| Posted: Thu Aug 06, 2020 5:46 pm Post subject: Re: Thermostat/flaps parts question |
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| EverettB wrote: |
| Is that dirt/grease on it? You could clean it up a little or put it in some boiling water and try to scrub it a little. |
A heated ultrasonic cleaner does a great job.
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busdaddy
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| Posted: Thu Aug 06, 2020 6:04 pm Post subject: Re: Thermostat/flaps parts question |
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| Glenn wrote: |
| EverettB wrote: |
| Is that dirt/grease on it? You could clean it up a little or put it in some boiling water and try to scrub it a little. |
A heated ultrasonic cleaner does a great job. |
Agreed, but brake kleen and compressed air is nearly the same, if it's really stuck down in there floss it with some string or thin cardboard. You can bend the thermostat slightly to one side to expose the bottoms of the pleats, but be careful, go slow and do a little at a time.
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toxicavenger70
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Joined: July 28, 2019
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Location: CO
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| Posted: Thu Aug 13, 2020 10:04 am Post subject: Re: Thermostat/flaps parts question |
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A little bit of an update. Here is a pic of the reconditioned thermostat I got in from bugguy1967. It looks a lot better than what I have. I also purchased all new hardware from him also. Since I am working with a car without the flaps/thermostat I am trying to reinstall it.
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Eric&Barb
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Joined: September 19, 2004
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| Posted: Thu Aug 13, 2020 10:51 am Post subject: Re: Thermostat/flaps parts question |
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What is the thermo range of the old thermostat?
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toxicavenger70
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| Posted: Thu Aug 13, 2020 1:34 pm Post subject: Re: Thermostat/flaps parts question |
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| Eric&Barb wrote: |
| What is the thermo range of the old thermostat? |
80 - 85. It is one I got used off of the classifieds here. Does that change the style of the thermostat vanes? |
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Eric&Barb
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| Posted: Thu Aug 13, 2020 2:05 pm Post subject: Re: Thermostat/flaps parts question |
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| toxicavenger70 wrote: |
| Eric&Barb wrote: |
| What is the thermo range of the old thermostat? |
80 - 85. It is one I got used off of the classifieds here. Does that change the style of the thermostat vanes? |
No, just means early type that the engine runs a bit cooler in cold weather. The higher opening temp is better.
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vamram
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| Posted: Thu Aug 13, 2020 7:27 pm Post subject: Re: Thermostat/flaps parts question |
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Isn't 80-85 for fuel injection engines?
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Rome
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| Posted: Thu Aug 13, 2020 7:58 pm Post subject: Re: Thermostat/flaps parts question |
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| You can easily see the differences between the two t'stats above. The left one has less bellows fins, but each one is thicker with a rounded edge. The right one has more fins, but each one is thinner with a sharp edge. I don't know if each style is indicative of a specific temperature range... |
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Eric&Barb
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baldessariclan
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| Posted: Fri Aug 14, 2020 4:59 am Post subject: Re: Thermostat/flaps parts question |
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| Rome wrote: |
| I don't know if each style is indicative of a specific temperature range... |
The physical “style” of thermostat (i.e. number of ridges/bellows) doesn’t determine its operating temperature range. It’s the “working fluid” inside which does that.
I think that in the 65°-70°C temp. range thermostats, there is a small amount of methanol (boiling point approx. 65°C) based mixture inside. While in the 80°-85°C temp. range ones, suspect that the working fluid is small amount of ethanol (boiling point approx. 80°C) based mixture inside.
In any case, the operating temperature range for those thermostats is usually stamped somewhere on the top or bottom sides.
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toxicavenger70
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| Posted: Sat Aug 15, 2020 9:17 pm Post subject: Re: Thermostat/flaps parts question |
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I did a dry run of the installation of the flaps before I put the doghouse on the engine. You have to install the flaps connecting bracket after the doghouse is on the engine. When installing the dog house with the flaps installed you have to line up the thermostat rod to go between the second set of cylinder fins (towards the engine).
Here are some pics.
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Ry-dog
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Location: Lunenburg, MA
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| Posted: Tue Jul 15, 2025 6:34 pm Post subject: Re: Thermostat/flaps parts question |
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| Eric&Barb wrote: |
Just a shot into the dark here:
The end of the arm on the RH set of flaps, that the top of the rod that is connected to the thermostat below, needs to be checked that it has not been bent to end up closer to the flap. Should be about 3/8" between that flap arm and the flap itself. If bent closer, the flaps will not fully open. |
Wanted to be sure I am understanding the reference for the 3/8" between the flap arm (thermostat rod?) and flap itself. Wanted to be sure my flap is in spec prior to installing. Can anyone confirm my understanding as shown in the photo here or have any comments/observations on my flap 'C' clip condition? Thanks!
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bsairhead
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| Posted: Tue Jul 15, 2025 8:00 pm Post subject: Re: Thermostat/flaps parts question |
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| You can use a heat gun or run it up to temperature to properly adjust the bracket. |
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