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Running Cold

 
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Old 30 May 2019, 01:17 pm
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Join Date: Feb 2016
Posts: 63
Default Running Cold

Guys, our 2001 non-turbo is running cold.

Backstory: Just added blue devil head gasket repair because of concern about HG condition.

Symptom: Idling, car gets to normal op. temp and stays there.

When driving on highway, it drops low, almost down to a quarter.

Then, one time, I pulled in and the temp then climbed to about 3/4.

I tried bleeding the air out of the system. It hasn't gotten hot again, but continues to get cool when running on the highway.

Is this a stuck thermostat staying in the open position?
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Old 30 May 2019, 02:11 pm
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Location: Thousand Oaks, CA
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Default Re: Running Cold

I would suggest checking to see if you have a difference in temperature between the upper and lower radiator hoses.
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Old 30 May 2019, 03:31 pm
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Location: Lake Wales, FL
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Default Re: Running Cold

Do what Steve suggested. Checking a thermostat isn't that hard. Take yours out and look at it. If it's stuck open, you SHOULD be able to see it. If not, go get a new one and gasket and replace it anyway. That way, you've eliminated that possibility. Could be a partially clogged radiator.
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Old 30 May 2019, 03:31 pm
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Default Re: Running Cold

Check to see if your fan is working.
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Old 30 May 2019, 05:39 pm
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Default Re: Running Cold

Fan seems to be working fine, coming on/off when its appropriate.

I felt the upper radiator hose, and it was hot, but not crazy hot (felt like normal operating temp).

I'll try feeling it vs. lower rad next time.

Thanks.
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Old 30 May 2019, 07:22 pm
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Location: southeastern PA
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Default Re: Running Cold

I'd say a stuck open thermostat.

Sitting at idle, there's no cooling air over the radiator. Engine gets up to temp, fan kicks on and regulates the engine temp.

Running on the highway drives air over the radiator. With a continuous flow of coolant, due to a stuck open thermostat, the engine can never get up to operating temperature.
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Old 03 Jun 2019, 02:00 pm
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Join Date: Feb 2016
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Default Re: Running Cold

Replaced thermostat -- same issue...?

I felt the upper and lower rad hoses, they are both hot, same temp.

I cracked the bleeder valve on the filler neck, and it spurt out what seemed to be air and coolant.

Closed valve and drove again, same issue.

Do I have air entering system somehow? God please not the water pump seal.

Ideas???
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Old 03 Jun 2019, 02:07 pm
Fk5 Fk5 is offline
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Default Re: Running Cold

Quote:
Originally Posted by mtyson View Post
I cracked the bleeder valve on the filler neck, and it spurt out what seemed to be air and coolant.

Closed valve and drove again, same issue.
What was the purpose of cracking the bleeder screw? To let the air out? You are supposed to let it out until it is streaming nothing by water. Is the radiator full? You can either use the bleeder, or get one of those Lisle giant funnels that let you keep a bunch of water in them and run the car until the thermostat opens. Personally, I usually just top it off at the filler neck and the overflow, then I drive it around and every time it is cooled off I recheck for a few cycles. I have had pretty good luck like that. Some say it is best to park with the front of the car uphill. That just happens to be the way my driveway points.
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Old 03 Jun 2019, 02:29 pm
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Join Date: Feb 2016
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Default Re: Running Cold

"What was the purpose of opening bleeder?"

I thought to myself: maybe air is trapped in there and causing it to show a low temp.

I have "burped" it several times, by putting a funnel that fits tightly in the filler neck, and filling it with water and letting bubbles come out. (I also wait for the thermostat to open to try to get all air out).

I just continues to run cold, so I'm a bit at a lose. Is air getting in there? But if its air, then I'd think the thermostat would also remain closed, causing the upper rad hose to be colder than lower, and also the engine to overheat.

I'm just trying to figure this thing out, thank you guys.
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Old 03 Jun 2019, 03:44 pm
Fk5 Fk5 is offline
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Default Re: Running Cold

i have not had a thermostat issue with one of these, but if there were trapped air, it would run hot, not cold. I would tell you not to worry except for the
Quote:
Then, one time, I pulled in and the temp then climbed to about 3/4.
Do you have a scan gauge or ultra-gauge? Maybe your gauge or sender is just screwy. Maybe the head gasket gunk blocked the passage near the sender? I'm not even 100% sure where these take the reading. My old Imperial took actual coolant readings. Problem was when it all leaked out, there was no water to be hot and it didn't light the idiot light. Then the idiot overheated his engine. The 2.2 cars took it from a stud on the head.

My wild ass guess is that the sender got gummed up with the blue devil, but you need to actually check the readings. If you look around online maybe there is an explanation on how to do it with a voltmeter.

Keep at it, good luck and let us know when you have it solved.
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