Question about Cars & Trucks
Blower works at all speeds, but only blows cold air. Temp gauge registers heat, rad hoses are hot, but turning temp knob doesn't change temp. THIS IS NOT a loose screw problem with the knob - I've checked that. Warn out servo motor? Cracked wire from control knob to servo, or something else?
Try locating the physical tap that connects your heater hoses to the interior of the car. note what position that tap is in before and after you turn up the temp dial inside. whatever connects the dial to the tap may be damaged.
if the tap itself turns then the heater side of the blower may be blocked.
Posted on Feb 14, 2014
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Posted on Jan 02, 2017
You have a broken wire connection between the temperature control knob and the circuit board behind the center dash console. Vibration causes the failure and once the control knob gets loose the solder connection fails.
For someone that knows how to remove the dash unit and can re-solder a couple of new wires this fix should take no more than 1 hour. Make sure that you apply loctite to the heat control knob spindle nut when you re-assemble it.
The dealer quoted me 750 dollars to fix this issue and I found out that it's a common failure for this year. I fixed mine virtually for free but it took some tools and about an hour of my time.
Posted on Jun 21, 2009
Jeep Grand Cherokee is notorious for broken blend-air doors. This is the door inside the A/C-heater housing that switches the air from hot to cold. You must remove the dash to repair it.
Posted on Nov 13, 2011
charge the a/c add a/c dye and ck. for leaks
Posted on Jun 18, 2012
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troubleshoot this types of problem,click the link below :---
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This will help.Thanks.
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