Guest loupet Posted March 24, 2017 Share Posted March 24, 2017 Hey everybody Lou again and, need help in trying to diagnose my dash problem. When you first start the car the dash lights up normally but, within 5 minutes of driving the dash goes dark. Only reads "Error" and the "electrical problem light" and "service engine light" comes on. I did a system check for codes and a bunch came up with an H at he end and, some with a C. If I`m correct the H means HISTORY and the C means CURRANT. Hope I`m right on these letters. I would think that the C codes should be fixed first being that they are currant. Any help on what to do next will be appreciated. All you guys are a God sent to me. Thanks. Lou Link to comment Share on other sites More sharing options...
DAVES89 Posted March 24, 2017 Share Posted March 24, 2017 What are the numbers in front of the "C" 1 Link to comment Share on other sites More sharing options...
Guest loupet Posted March 24, 2017 Share Posted March 24, 2017 Hey Dave the codes with Care 27C 420C 671C 673C Link to comment Share on other sites More sharing options...
Guest loupet Posted March 24, 2017 Share Posted March 24, 2017 Sounds like what I like to do too. Link to comment Share on other sites More sharing options...
Guest loupet Posted March 24, 2017 Share Posted March 24, 2017 The codes 671 Servo position sensor 673 vacuum solenoid circuit 420 relay circuit problem. These codes have the letter C next to them. Code 420 relay circuit problem. Could this be what`s clicking the ac on and off too? Link to comment Share on other sites More sharing options...
Ronnie Posted March 24, 2017 Share Posted March 24, 2017 The first two codes might go hand in hand with your problem with the air coming out the vent since they could all be vacuum related. 1 Link to comment Share on other sites More sharing options...
KDirk Posted March 24, 2017 Share Posted March 24, 2017 Yes, I'd check all vacuum line in the engine bay. The age of these cars means that most now need all rubber vacuum hose replaced due to dry rot. This can also result in ends on hoses breaking off the fittings they are attached to. I've done all new hose on two of mine already. The instrument cluster issue could be a bad cluster or a failing data line being pulled down by another module. Loss of network communication will also cause the HVAC to default to defrost mode from the dash vent. You are going to need a factory manual to troublesboot this car successfully, as it sounds like you have multiple failures to find and repair. Link to comment Share on other sites More sharing options...
DAVES89 Posted March 25, 2017 Share Posted March 25, 2017 There is a HVAC programmer located ubder the dash. What I was referring to about a week ago was the dash mounted Temperature Control located just above the stereo. All Reattas have the Blower Control Module. You and I were talking about 2 different units. 1 Link to comment Share on other sites More sharing options...
KDirk Posted March 25, 2017 Share Posted March 25, 2017 (edited) There is an A/C programmer (black box in dash behind glovebox) on all four years of Reatta. The programmer is the device that actually controls air distribution via both vacuum dampers and a motorized blend door. It also controls the rear defrost timeout via relay. The only difference between 88/89 and 90/91 is that the user interface is via the CRT on early cars and by the HVAC control panel in 90/91. The rest of the system is essentially the same. There is also a blower control module in the air box, same on all four years. This only regulates the voltage to the blower to control the speed. Aside from some plastic semi-rigid vacuum tubing in the engine bay near the fire wall, most is black rubber and by this age will be shot on most cars unless they are pampered garage queens. I have had rubber vacuum hose so rotted it sucked flat under the vacuum pressure, leaving me with HVAC and cruise control failures. I'd say as standard practice all rubber vacuum hose in the engine bay should be replaced now on any Reatta that hasn't already been done. It is cheap enough that there is no reason to avoid doing so short of being lazy, and Will save many future headaches. Edited March 25, 2017 by KDirk (see edit history) Link to comment Share on other sites More sharing options...
Ronnie Posted March 25, 2017 Share Posted March 25, 2017 Primary areas to look for vacuum leaks in the engine compartment are shown in the photos below.. I should add this to ROJ if I haven't already done so. 2 Link to comment Share on other sites More sharing options...
DAVES89 Posted March 25, 2017 Share Posted March 25, 2017 Lou review the AC story from July 4 2004 that I found for you. Maybe Barney can post his how to description to help. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now