1998 Ford Ranger xlt

have it checked out professionally as it may be worn rocker arm bushes/shaft or push rods as you say
unless there is cam damage ( rare ) then it is not necessary to replace the cam shaft.
cam followers may be hydraulic and can be checked

I suggest you try one of those instant download manuals. My nephew bought one for me when my car broke and we could fix it all by ourselves with the manual costing $10. This website reliable-store.com is very good for this.
?Try there live chat for better help
also try manualslife.com but there's not live chat option there. these 2 are pretty good with repairing stuff. really good

the heater vacuum motor and lines needs to be checked.Also get the blend door checked.

NO HEAT ON FLOOR VENTS

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As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html

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No heat on Oldsmobile Silhouette?

http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

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Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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Hot air on the driver's side vents only?

http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

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Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

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1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold?

http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

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No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html

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Ford F150 Ac only blows through defrost vents?

http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

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Dodge A/C come out of defrost vents only?

http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

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Ac vacuum line on dodge cummins?

http://technoanswers.blogspot.com/2012/01/ac-vacuum-line-on-dodge-cummins.html

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Ford ranger AC blows cold through defrost vents instead on cabin vents?

http://technoanswers.blogspot.com/2012/01/ford-ranger-ac-blows-cold-through.html

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2005 Chrysler PT Cruiser: A/C Blows Warm?

http://whoisbyme.blogspot.in/2012/06/2005-chrysler-p8t-cruiser-ac-blows-warm.html

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2009 Mercury Grand Marquis: A/C blows Cold From Defrost Vent Only?

http://whoisbyme.blogspot.in/2012/06/2009-mercury-grand-marquis-ac-blows.html

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AC not blowing through Vents on 2007 Chevy Trailblazer?

http://schematicsdiagram.blogspot.in/2012/04/ac-not-blowing-through-vents-on-2007.html

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Passenger side temperature is warm air out of dash vents?

http://schematicsdiagram.blogspot.in/2012/04/passenger-side-temperature-is-warm-air.html

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These will help.

Thanks.

Was the a/c compressor running when you got this reading?

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

when car is at operating temp both heater pipes should be more or less the same temperature. If one is cold, try getting the car up in the air so the radiator or expansion tank is higher than the heater...release (carefully) the pressure cap and give the engine three good revs, see if any air comes out and heater pipes equalise. I there is no air in your system you may have a heater water valve fault. Try to locate valve and see what contols it (mechanical , electrical, vacuum)..maybe itcan be manually moved to open, maybe it neds to be replaced.
If you replace it, the air must be bled from the cooling system (see above), but run car until warm with cap off and air will bubble out.
always check coolant levels later when car is cold. Top up coolant as required.

If your trying to charge your ac and you have a charging kit the fittings on the charging kit are designed to only fit on the low side quick connect. If that isn't what your trying to do i'd have to go look to describe better.

I have a 98 ext. cab with AC, it was a low charge on mine. An O-ring was leaking. good luck, the O-ring set is cheap. I think it was autozone that carried them.
regards, gthsr911

have you checked the mixing motor and the door?pull out the glove box you will see a white motor remove it 5/16 or 8mm plug it back in run the system to see if the shaft on the motor works then check where the shaft fits in the top of the door if it's broke cut the box under the door w/ a dremal remove door fix if posible reverse steps good luck.i'm doing this now i fixed the oor but the compressor wont come on any ideas???????????

It sounds like you have a leak somewhere in your intake manifold. Have all hoses and seals checked. If the idle air control valve is malfunctioning it would cause the engine to idle high even after the engine is warmed up. Have it checked also.

Hi

Does this only happen once the engine has warmed up? if so, does the truck accelerate if you put your foot to the boards? If so then have the O2 sensor checked out.

Otherwise, have the fuel pressure checked out, it sounds like it may be a wee bit low.

Regards

Geordie