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PS Gets Harder as Car Gets Hotter

This is a discussion on PS Gets Harder as Car Gets Hotter within the Flair Birds [1964-1966] forums, part of the Thunderbird Model Years category; Hi, After replacing the ps pump and and steering gear box, I noticed that the steering is easy when the ...

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  #1 (permalink)   IP: 75.161.248.250
Old 08-30-2012, 06:54 PM
'65 Convertible
 
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PS Gets Harder as Car Gets Hotter

Hi,
After replacing the ps pump and and steering gear box, I noticed that the steering is easy when the car (and pump) is cold but gets increasingly more difficult as I drive. It's almost as if I have very little PS pressure when the pump is hot. It's almost impossible to parallel park - it's that stiff.

Also, when this happens, the pump gets too hot to touch. How hot should it get?

I'm using PS fluid in the system. Would it make a difference if I switched to ATF? If so, which brand of ATF should I use?

Suggestions?
Ken in MN
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  #2 (permalink)   IP: 174.125.194.37
Old 08-30-2012, 10:57 PM
 
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Garage
Use "Type F" automatic transmision fluid in the power steering system. Doing so will probably cure the problem.
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  #3 (permalink)   IP: 204.77.37.219
Old 09-04-2012, 01:41 PM
'65 Convertible
 
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BillinAL,
I syphoned out the old PS fluid (three times) and replaced it with Type FA AT fluid. I hasn't made an appreciable difference in the steering. In as little as 15 min of city driving, I can tell that the effort to move the wheel is getting harder. The pump still gets very hot (too hot?) - way too hot to touch. I need to use a rag to remove the cap when checking the fluid level. Any other ideas?

Does anyone have any input about how hot their pump gets when driving?

Ken in MN
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  #4 (permalink)   IP: 173.74.104.177
Old 09-04-2012, 07:17 PM
 
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Harley Eaton is on a distinguished road
You may need new hoses. Could be a flow restriction somewhere. It might very well get more restricted as you use it.
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