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rickyreeves1
Anonymous Poster
mawmawdmr@yahoo.com

Aug 1, 2009, 11:52 AM

Post #1 of 11 (1715 views)
truck a/c Sign In

the a/c in my 1999 ford f150 will cool then get hot like the heater is on then after a while will cool again. freon level is good


Sidom
Veteran / Moderator
Sidom profile image

Aug 1, 2009, 12:29 PM

Post #2 of 11 (1711 views)
Re: truck a/c Sign In

1st thing you would want to know is, if the compressor turning off or running during the time it gets hot.

How did you determine the system was fully charged?


Guest
Anonymous Poster

Aug 1, 2009, 12:35 PM

Post #3 of 11 (1710 views)
Re: truck a/c Sign In

compressor is running when air is hot. checked freon with gage


Sidom
Veteran / Moderator
Sidom profile image

Aug 1, 2009, 12:38 PM

Post #4 of 11 (1708 views)
Re: truck a/c Sign In

Ok.... What are your High & low pressure reading and what is the ambient temp. Is the system cycling? How low is the low side going before it cycles. Also try pinching off your heater hoses to see if that makes a difference........


Guest
Anonymous Poster

Aug 1, 2009, 12:45 PM

Post #5 of 11 (1705 views)
Re: truck a/c Sign In

high is 225, low is 50 ambient temp. is 85-90. system is cycling. dont know how low before it cycles. will try pinching hose tomorrow


Guest
Anonymous Poster

Aug 1, 2009, 12:48 PM

Post #6 of 11 (1704 views)
Re: truck a/c Sign In

thanks sidom


Guest
Anonymous Poster

Aug 2, 2009, 12:22 PM

Post #7 of 11 (1693 views)
Re: truck a/c Sign In

pinching off heater hose seems to have made a difference. now what should i do? can i run the vehicle with the hose pinched off safely?


Sidom
Veteran / Moderator
Sidom profile image

Aug 2, 2009, 1:01 PM

Post #8 of 11 (1689 views)
Re: truck a/c Sign In

Well, it's not like you're gonna overheat you truck doing that. Plenty of people are driving around with plugged heater cores which basically is what your are doing....

So the vent temps are normal now the lines are blocked off? If that's the case then sounds like you are having a blend door problem. If it's just doing it under low vacuum conditions (hard acceration) then you might get by with installing an addition vacuum storage reservoir due to a weak vacuum motor.........


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 2, 2009, 1:09 PM

Post #9 of 11 (1687 views)
Re: truck a/c Sign In

That blend door actuator is electric on that one.

Here's what it looks like
and instructions to change it. They say the whole dash has to be removed but you may be able to sneak it out.





~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Aug 2, 2009, 1:10 PM)


Guest
Anonymous Poster

Aug 2, 2009, 1:16 PM

Post #10 of 11 (1680 views)
Re: truck a/c Sign In

thanks sidom and hammer time for your help.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 2, 2009, 1:20 PM

Post #11 of 11 (1675 views)
Re: truck a/c Sign In

Here's what the motor itself looks like.







~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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