Overheating on the highway

Ricochet · Jul 20, 2009

I've got a strange problem. I can wheel all day long with the air conditioner running and will maintain 210 degrees. As soon as I hit the highway, its in the red which I usually have to put the heat on full blast to keep it somewhat cooler. I just changed the fan clutch but that did nothing. I also have hood vents installed. Thanks.

bigalpha · Jul 20, 2009

Hood vents won't lower your coolant temp; it only lowers engine bay temps.

I believe that running hot at speed is a 'low flow' problem. i.e., bad WP.

Shred Bro Gnar Rad · Jul 20, 2009

mine did the same thing this passed weeked driving up to PA. It did it so bad my Coolant Resevoir exploded...

FIAL!

i need to clean out my RAd, and i think i might change out my Water pump....

jeeperjohn · Jul 20, 2009

Check to see if your lower radiator hose is very soft. It can collapse at higher RPMs and kill your coolant flow. If the water pump were bad it would overheat in all conditions, especially low engine speeds. Another slight possibility is if your tranny is automatic, it could be going bad and getting extremely hot transferring the heat into your coolant as it passes through the tranny cooler in the radiator.

Mosephus · Jul 20, 2009

Also check your fan clutch, if it is bad it won't be able to spin at highway speeds like it should.

wim hoppenbrouwers · Jul 20, 2009

Mosephus said:
Also check your fan clutch, if it is bad it won't be able to spin at highway speeds like it should.

Hallo. The fan clutch is doing his job by idle and traffic.
On the highway there is a lot of airflow. :shhh:

Mosephus · Jul 20, 2009

You'd be suprised, it has caused that problem on two of my past vehicles.

jrowell · Jul 20, 2009

Mosephus said:
You'd be suprised, it has caused that problem on two of my past vehicles.

I agree. I can be cruising down the freeway and my temp will be just passed 210. Flick on my electric fan, and the temp will drop to 190-200. Fans do make a difference at highway speeds on my rig.

EDIT: although I do see he already put a new clutch fan in...

tharlanjr · Jul 20, 2009

How did you put a switch on your E-fan?

I had a bad overheating problem and while I was checking it out (had it running and warmed up) the E-Fan never came on. Which is what I think my problem was.

I was thinking about connecting it to a relay so it turns on automatically when I turn the ignition on, but I would rather have a switch.

sorry for hijack, but I am having same problem...

jrowell · Jul 20, 2009

tharlanjr said:
How did you put a switch on your E-fan?

I just ran a switch that activates a relay to turn the fan on. In the summer, I just leave the fan on all the time. It may just be in my head, but I think my fan spins faster with the new power wire I ran to it.

RCP Phx · Jul 21, 2009

jeeperjohn said:
If the water pump were bad it would overheat in all conditions, especially low engine speeds.

Not true,if the impeller has any issues(example:corrosion) it can cause cavitation at high rpm's but flow fine at low rpm's.

jeeperjohn · Jul 21, 2009

You might try a flow restrictor like the one Gojeep did.

Overheating on the highway

Ricochet

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bigalpha

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Shred Bro Gnar Rad

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jeeperjohn

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Mosephus

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wim hoppenbrouwers

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Mosephus

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jrowell

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tharlanjr

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jrowell

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RCP Phx

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jeeperjohn

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