Thermostat not working ?, Engine running hot |
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Thermostat not working ?, Engine running hot |
North Coast Jim |
Aug 18 2019, 03:11 PM
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#1
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Member Group: Members Posts: 323 Joined: 11-December 15 From: Northern Ohio Member No.: 19,450 Region Association: MidAtlantic Region |
Drove about 50 miles at ambient temps of 90 degrees. All flat terrain. Turnpike driving at 75 mph. Engine temp continued to rise approaching red zone. Slowed down and over time temps stabilized. Still high in my estimation. I only have the temp gauge in the console. The std gauge.
Took a picture of the thermostat cable and flap connection when I got back home. Reviewed it with a cold engine and compared. The flap control isn't moving. Looks like thermostat is not working as all other components work and are not bound up. This is a hard to find part. Any suggestions for where to go and purchase. Lastly I've not yet got around to assembling the heat control in the car. I don't have the flaps on either side at the bottom of the blower housing. Neither do I have the lower heat shields installed. I do have the cylinder shields installed on the bottom. Do these components effect engine cooling ?? Appreciate any and all help. Want to get this fixed before Octeenerfest. |
Superhawk996 |
Aug 18 2019, 03:24 PM
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#2
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914 Guru Group: Members Posts: 5,777 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
Thermostat can be tested by removing and heating gently with heat gun.
If you don't get expansion / contraction it is dead as a final verification. |
SirAndy |
Aug 18 2019, 03:42 PM
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#3
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Resident German Group: Admin Posts: 41,614 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
The thermostat is supposed to fail in the max. cooling position so even if it isn't working, that shouldn't be your problem ...
(IMG:style_emoticons/default/idea.gif) |
rhodyguy |
Aug 18 2019, 03:44 PM
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#4
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,071 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
unfasten the wire at the small tab and see if the flaps go to the default position. You should be able to move the vanes back and forth by hand.
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bbrock |
Aug 18 2019, 03:51 PM
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#5
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
The thermostat is supposed to fail in the max. cooling position so even if it isn't working, that shouldn't be your problem ... (IMG:style_emoticons/default/idea.gif) (IMG:style_emoticons/default/agree.gif) Unless the original thermostat has been replaced with one of this which I believe fail in the minimum cooling position. (IMG:http://www.914world.com/bbs2/uploads_offsite/c767170.r70.cf2.rackcdn.com-20845-1566165106.1.jpg) Awesome Powdercoating is a good place to get OE style thermostats, cables, and parts. |
Rand |
Aug 18 2019, 05:18 PM
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#6
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
Just check the position of the flaps. As alluded to, twist the crank and see if it snaps back. It would better to clip the cable and have it warm up slower than overheat later. But don't because as Andy said, they fail safe. I don't know the other thing someone mentioned, it's not common in my world
Then there's timing: Too advanced = higher head temps, too retarded = higher oil temps. It needs to be right. |
worn |
Aug 18 2019, 05:30 PM
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#7
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can't remember Group: Members Posts: 3,150 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest |
Lastly I've not yet got around to assembling the heat control in the car. I don't have the flaps on either side at the bottom of the blower housing. Neither do I have the lower heat shields installed. I do have the cylinder shields installed on the bottom. Do these components effect engine cooling ?? Appreciate any and all help. Want to get this fixed before Octeenerfest. You would be expected to lose some cooling if you have the fan casing vents that drive air to the heater flap valves simply open to the air. The system takes some of the air used for motor cooling and either runs it through the heat exchangers or dumps it to the air past the moving flap. This has some resistance to flow, so if the entire run is disconnected more air will be diverted from engine cooling, out through the fan shroud openings. I doubt this is a large effect, but may make some difference. I find that when you get up to around 75 mph it starts to take a lot of power to move the car through the air. Then you hit a hill and start to worry. Maybe others have had better luck. |
bbrock |
Aug 18 2019, 09:10 PM
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#8
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
I don't know the other thing someone mentioned, it's not common in my world The pic I posted is a Mexican built thermostat that is being sold by some vendors as a replacement for the more expensive OE style thermostat. There is more info on them about half way down this page. I wouldn't buy one but the fact they are out there means we can't assume everybody's thermostats are fail safe anymore. |
iankarr |
Aug 19 2019, 01:01 AM
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#9
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The wrencher formerly known as Cuddy_K Group: Members Posts: 2,472 Joined: 22-May 15 From: Heber City, UT Member No.: 18,749 Region Association: Intermountain Region |
I’d put the engine tins in place. They all work together as a system. Are the rubber engine tin seals installed correctly? Do you know if the top of the oil cooler is clean? And/or if the cooler itself isn’t gummed up? If your timing is on and everything else check out, it could also be the sender or gauge. Check the engine case with an infrared thermometer when hot to get a sense of the actual temp...
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North Coast Jim |
Aug 19 2019, 07:47 AM
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#10
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Member Group: Members Posts: 323 Joined: 11-December 15 From: Northern Ohio Member No.: 19,450 Region Association: MidAtlantic Region |
I’d put the engine tins in place. They all work together as a system. Are the rubber engine tin seals installed correctly? Do you know if the top of the oil cooler is clean? And/or if the cooler itself isn’t gummed up? If your timing is on and everything else check out, it could also be the sender or gauge. Check the engine case with an infrared thermometer when hot to get a sense of the actual temp... Engine was rebuilt 2 years ago and now have 1500 miles on it. Oil cooler was new. I do have a few oil leaks which will be addressed when I get back from Octeenerfest. The Melling oil pump leaks at the peripehery. Gasket is paper thin. Oil temp sending unit at bottom of the case also leaks, but don't they all. Plan on doing the billet aluminum replacement. Rubber around tins needs some repositioning. It is intact completely around the engine bay. Timing is at 31 degrees BTDC. I did check the heads around the exhaust on the forward cylinders. Was surprised to find the temp on the pass side 50 degrees hotter than on the drivers side. Is this normal ?? |
nditiz1 |
Aug 19 2019, 08:11 AM
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#11
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Senior Member Group: Members Posts: 1,180 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region |
After thought now, but you don't need any gasket for the oil pump. 518 locktite and you are good to go. I also don't like melling personally. In a beetle its fine, but I would go blue printed stock first, then Schadek, then a good stock one as far as choices.
Timing seems a little high, but not knowing your setup its hard to determine. If it runs and runs well that might not be the issue. Definitely check the function of the T-stat with a heat gun. |
ericoneal |
Aug 19 2019, 10:46 AM
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#12
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Member Group: Members Posts: 320 Joined: 13-August 12 From: Crestwood, KY Member No.: 14,795 Region Association: South East States |
My thermostat works partially, but does not open all the way. The engine was getting very warm after an evening drive, so I loosened the screw on the flaps, then they completely popped open. May be what you are seeing here..
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Mark Henry |
Aug 19 2019, 11:09 AM
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#13
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
I have seen the cooler flap drop link arm turned so it's pushing the wrong way, insure that the flaps are working correctly.
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porschetub |
Aug 20 2019, 01:39 AM
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#14
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Advanced Member Group: Members Posts: 4,697 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
asked about that Brazil thermostat recently ,hinted about failure rate and fishing but AA didn't take the bait as they sell them,others do also,no issues so far on other forums but if you don't have gauges are you safe from overheating ..buggered if I know but hardly a safe option with the function of this part.
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